Al–Cu phases

23 phases (tier A 8, tier C 5, liquid 1, needs_review 9); 22 stable in a calculated diagram. Structure types are assigned only when the stored evidence supports an assignment under the stated tier rules (tier A: standard phase name; tier B: unique Materials Project + OQMD on-hull match, DFT-supported; tier C: one structure stated by the assessment's crystallographic table, assessor-stated); other phases list candidates and are marked needs_review. Stability is from phase diagrams calculated with pycalphad from the SGTE binary collection (evidence class: model).

Data: interactive registry · full JSON · Al–Cu system page · Markdown · field reference

Phases of the Al–Cu system (23)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
AL2CU_C16 phase:al-cu:al2cu-c16	Al2Cu · C16 · tI12 · I4/mcm (140)	tier A: standard phase name	stable in 4 of 4 calculated diagram(s): 300–869.01 K, x(Cu) 0.31631–0.3367	12	4
AL2CU_PRIME phase:al-cu:al2cu-prime		needs_review	not stable in 2 calculated diagram(s)	0	2
AL2CU3 phase:al-cu:al2cu3	Al5Cu8 · hR52 · R3m (160)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 2 of 2 calculated diagram(s): 300–959.78 K, x(Cu) 0.6–0.6	0	2
AL3CU4_HT phase:al-cu:al3cu4-ht		needs_review	stable in 1 of 1 calculated diagram(s): 645.25–854.09 K, x(Cu) 0.561–0.561	6	1
AL3CU4_LT phase:al-cu:al3cu4-lt		needs_review	stable in 1 of 1 calculated diagram(s): 300–833.46 K, x(Cu) 0.573–0.573	0	1
AL4CU9_D82 phase:al-cu:al4cu9-d82	Cu5Zn8 · D8_2 · cI52 · I-43m (217)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 1054.21–1293.41 K, x(Cu) 0.65575–0.68881	0	2
AL4CU9_D83 phase:al-cu:al4cu9-d83	Al4Cu9 · D8_3 · cP52 · P-43m (215)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1150.5 K, x(Cu) 0.62135–0.69231	0	2
AL4CU9_GAMMA phase:al-cu:al4cu9-gamma		needs_review	stable in 1 of 1 calculated diagram(s): 300–1293.77 K, x(Cu) 0.61724–0.70148	11	1
AL5CU8 phase:al-cu:al5cu8	Al5Cu8 · hR52 · R3m (160)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 2 of 2 calculated diagram(s): 300–960 K, x(Cu) 0.59596–0.61545	9	2
AL9CU11 phase:al-cu:al9cu11		needs_review	stable in 3 of 3 calculated diagram(s): 300–874.57 K, x(Cu) 0.55–0.5574	0	3
ALCU_ETA_1 phase:al-cu:alcu-1-eta	AlCu(h) · oC32 · Cmmm (65)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 846.87–898.18 K, x(Cu) 0.50891–0.51225	0	1
ALCU_ETA_2 phase:al-cu:alcu-2-eta		needs_review	stable in 1 of 1 calculated diagram(s): 300–871.03 K, x(Cu) 0.52–0.52	0	1
ALCU_B82 phase:al-cu:alcu-b82		needs_review	stable in 4 of 4 calculated diagram(s): 830.82–1124.24 K, x(Cu) 0.5403–0.60043	28	4
ALCU_ETA phase:al-cu:alcu-eta		needs_review	stable in 2 of 2 calculated diagram(s): 300–898.11 K, x(Cu) 0.5–0.51097	0	2
ALCU_ETA_HT phase:al-cu:alcu-eta-ht	AlCu(h) · oC32 · Cmmm (65)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 846.77–897.67 K, x(Cu) 0.51175–0.5165	17	1
ALCU_ETA_LT phase:al-cu:alcu-eta-lt	AlCu(r) · mC20 · C2/m (12)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–871.89 K, x(Cu) 0.5–0.53158	11	1
ALCU3_D022 phase:al-cu:alcu3-d022		needs_review	stable in 2 of 2 calculated diagram(s): 300–640 K, x(Cu) 0.77–0.77	0	2
BCC_A2 phase:al-cu:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 5 of 5 calculated diagram(s): 300–1329.45 K, x(Cu) 0.32085–0.81606	38	5
GAMMA_D82 phase:al-cu:d82-gamma	Cu5Zn8 · D8_2 · cI52 · I-43m (217)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 1050.72–1286.31 K, x(Cu) 0.64361–0.69815	16	2
GAMMA_D83 phase:al-cu:d83-gamma	Al4Cu9 · D8_3 · cP52 · P-43m (215)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1145.67 K, x(Cu) 0.62085–0.69906	20	2
FCC_A1 phase:al-cu:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 5 of 5 calculated diagram(s): 300–1358.62 K, x(Cu) 0–1	16	5
HCP_A3 phase:al-cu:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 5 calculated diagram(s): 747.05–1015.23 K, x(Cu) 0.26592–0.37287	0	5
LIQUID phase:al-cu:liquid	liquid	liquid	stable in 5 of 5 calculated diagram(s): 820.61–2500 K, x(Cu) 0–1	42	5

AL2CU_C16 (Al–Cu)

Id: phase:al-cu:al2cu-c16; status assigned
Structure: Al2Cu · C16 · tI12 · I4/mcm (140); type st:c16-al2cu-ti12; tier A: standard phase name; confidence high
Caveat: partitioned order/disorder model in AlCu-21Kro.tdb also describes the disordered state
Stability: stable in 4 of 4 calculated diagram(s): 300–869.01 K, x(Cu) 0.31631–0.3367
Literature: 12 values (10 accepted) from 1 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:al-cu:al2cu-c16
paper: paper:10.1007/s10853-020-05423-7:θ
tdb: tdb:AlCu-04Wit.tdb:AL2CU_C16, tdb:AlCu-15Lia.tdb:AL2CU_C16, tdb:AlCu-21Kro.tdb:AL2CU_C16, tdb:AlCu-98Sau-LB.tdb:AL2CU_C16

TDB models of AL2CU_C16 (4): PHASE and CONSTITUENT statements as written

AlCu-04Wit.tdb: AL2CU_C16, type code %, sha256 7239fc4da5e79f40…

60: PHASE AL2CU_C16 % 2 2 1 !
61: CONST AL2CU_C16 : AL : AL CU% : !

AlCu-15Lia.tdb: AL2CU_C16, type code %, sha256 cc9baa9f2479820c…

50: PHASE AL2CU_C16 % 2 2 1 !
51: CONST AL2CU_C16 : AL : AL CU% : !

AlCu-21Kro.tdb: AL2CU_C16, type code %, sha256 bd06016e51db2bef…

45: PHASE AL2CU_C16 % 2 2 1 !
46: CONST AL2CU_C16 : AL% CU : AL CU% : !

AlCu-98Sau-LB.tdb: AL2CU_C16, type code %, sha256 bed1eea6f6cf10b8…

57: PHASE AL2CU_C16 % 2 2 1 !
58: CONST AL2CU_C16 : AL : AL CU% : !

Example references (4 of 4; assessments first):

doi:10.1007/s10853-020-05423-7 Aleš Kroupa, Ondřej Zobač, Klaus W. Richter, The thermodynamic reassessment of the binary Al–Cu system, J Mater Sci 56, 3430-3443 (2021).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2015.10.004 Liang SM, Schmid-Fetzer R (2015) Thermodynamic assessment of the Al–Cu–Zn system, part II: Al–Cu binary system. CALPHAD 51:252–260
assessment that models this phase; cited as the source of values for this phase
doi:10.1016/j.jallcom.2004.04.126 V.T. Witusiewicz, U. Hecht, S.G. Fries, S. Rex, The Ag–Al–Cu system, Journal of Alloys and Compounds 385, 133-143 (2004).
assessment that models this phase
doi:10.1016/j.intermet.2011.07.007 Norbert Ponweiser, Christian L. Lengauer, Klaus W. Richter, Re-investigation of phase equilibria in the system Al–Cu and structural analysis of the high-temperature phase η1-Al1−δCu, Intermetallics 19, 1737-1746 (2011).
cited as the source of values for this phase

AL2CU_PRIME (Al–Cu)

Id: phase:al-cu:al2cu-prime; status needs_review
No structure assigned. Why: assessment_declared_conflicts_with_dft; name_has_descriptive_tokens:PRIME; no_structure_token
Candidate (dft_mp): Fm-3m (225) — on-hull MP Al2Cu at x(CU)=0.3333
Candidate (dft_oqmd): Fm-3m (225) — on-hull OQMD Al2 Cu1 at x(CU)=0.3333
Candidate (sgte_mmc2): Al2Cu · oF24 · Fmmm (69) — Hallstedt 2025 mmc2 row for AL2CU_PRIME: Al2Cu (theta-prime, metastable)
Candidate (tdb_comment): Al2Cu · oF24 · Fmmm — AlCu-04Wit.tdb: 'Prototype Al2Cu (oF24, Fmmm)'
Candidate (tdb_comment): Al2Cu · oF24 · Fmmm — AlCu-98Sau-LB.tdb: 'Prototype Al2Cu (oF24, Fmmm)'
Stoichiometry: Al 0.6667, Cu 0.3333
Stability: not stable in 2 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:al-cu:al2cu-prime
tdb: tdb:AlCu-04Wit.tdb:AL2CU_PRIME, tdb:AlCu-98Sau-LB.tdb:AL2CU_PRIME

TDB models of AL2CU_PRIME (2): PHASE and CONSTITUENT statements as written

AlCu-04Wit.tdb: AL2CU_PRIME, type code %, sha256 7239fc4da5e79f40…

66: PHASE AL2CU_PRIME % 2 2 1 !
67: CONST AL2CU_PRIME : AL : CU : !

AlCu-98Sau-LB.tdb: AL2CU_PRIME, type code %, sha256 bed1eea6f6cf10b8…

63: PHASE AL2CU_PRIME % 2 2 1 !
64: CONST AL2CU_PRIME : AL : CU : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2004.04.126 V.T. Witusiewicz, U. Hecht, S.G. Fries, S. Rex, The Ag–Al–Cu system, Journal of Alloys and Compounds 385, 133-143 (2004).
assessment that models this phase

AL2CU3 (Al–Cu)

Id: phase:al-cu:al2cu3; status assigned
Structure: Al5Cu8 · hR52 · R3m (160); type st:al5cu8-hr52; tier C: assessor-stated (Hallstedt 2025 crystallographic table); confidence assessor-stated
Structure source: B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, supplementary crystallographic table (mmc2) doi:10.1016/j.calphad.2025.102833
Caveat: not certain from the name or DFT alone (no_on_hull_entry_in_both, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Al 0.4000, Cu 0.6000
Stability: stable in 2 of 2 calculated diagram(s): 300–959.78 K, x(Cu) 0.6–0.6
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:al-cu:al2cu3
tdb: tdb:AlCu-04Wit.tdb:AL2CU3, tdb:AlCu-98Sau-LB.tdb:AL2CU3

TDB models of AL2CU3 (2): PHASE and CONSTITUENT statements as written

AlCu-04Wit.tdb: AL2CU3, type code %, sha256 7239fc4da5e79f40…

89: PHASE AL2CU3 % 2 2 3 !
90: CONST AL2CU3 : AL : CU : !

AlCu-98Sau-LB.tdb: AL2CU3, type code %, sha256 bed1eea6f6cf10b8…

86: PHASE AL2CU3 % 2 2 3 !
87: CONST AL2CU3 : AL : CU : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2004.04.126 V.T. Witusiewicz, U. Hecht, S.G. Fries, S. Rex, The Ag–Al–Cu system, Journal of Alloys and Compounds 385, 133-143 (2004).
assessment that models this phase

AL3CU4_HT (Al–Cu)

Id: phase:al-cu:al3cu4-ht; status needs_review
No structure assigned. Why: assessment_declared_compound_differs_from_model_composition; no_on_hull_entry_in_both; no_structure_token
Candidate (literature_printed): Al3Cu4(h) · oF88 — printed with a label mapped to this phase
Candidate (sgte_mmc2): Al3Cu4(h) · oF88 · Fmm2 (42) — Hallstedt 2025 mmc2 row for AL3CU4_HT: Al3Cu4 (zeta-1, high T)
Candidate (tdb_comment): Al3Cu4(h) · oF88 · Fmm2 — AlCu-21Kro.tdb: 'Prototype Al3Cu4(h) (oF88, Fmm2), Al9Cu11(h), zeta-1, high T'
Stoichiometry: Al 0.4390, Cu 0.5610
Stability: stable in 1 of 1 calculated diagram(s): 645.25–854.09 K, x(Cu) 0.561–0.561
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:al-cu:al3cu4-ht
paper: paper:10.1007/s10853-020-05423-7:ζ
tdb: tdb:AlCu-21Kro.tdb:AL3CU4_HT

TDB models of AL3CU4_HT (1): PHASE and CONSTITUENT statements as written

AlCu-21Kro.tdb: AL3CU4_HT, type code %, sha256 bd06016e51db2bef…

66: PHASE AL3CU4_HT % 2 0.439 0.561 !
67: CONST AL3CU4_HT : AL : CU : !

Example references (3 of 3; assessments first):

doi:10.1007/s10853-020-05423-7 Aleš Kroupa, Ondřej Zobač, Klaus W. Richter, The thermodynamic reassessment of the binary Al–Cu system, J Mater Sci 56, 3430-3443 (2021).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2015.10.004 Liang SM, Schmid-Fetzer R (2015) Thermodynamic assessment of the Al–Cu–Zn system, part II: Al–Cu binary system. CALPHAD 51:252–260
cited as the source of values for this phase
doi:10.1016/j.intermet.2011.07.007 Norbert Ponweiser, Christian L. Lengauer, Klaus W. Richter, Re-investigation of phase equilibria in the system Al–Cu and structural analysis of the high-temperature phase η1-Al1−δCu, Intermetallics 19, 1737-1746 (2011).
cited as the source of values for this phase

AL3CU4_LT (Al–Cu)

Id: phase:al-cu:al3cu4-lt; status needs_review
No structure assigned. Why: assessment_declared_compound_differs_from_site_ratios; no_structure_token; off_stoichiometric_model
Candidate (sgte_mmc2): Al3Cu4(r) · oI24 · Imm2 (44) — Hallstedt 2025 mmc2 row for AL3CU4_LT: Al3Cu4 (zeta-2, low T)
Candidate (tdb_comment): Al3Cu4(r) · oI24 · Imm2 — AlCu-21Kro.tdb: 'Prototype Al3Cu4(r) (oI24, Imm2), Al9Cu11(r), zeta-2/prime, low T'
Stability: stable in 1 of 1 calculated diagram(s): 300–833.46 K, x(Cu) 0.573–0.573
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:al-cu:al3cu4-lt
tdb: tdb:AlCu-21Kro.tdb:AL3CU4_LT

TDB models of AL3CU4_LT (1): PHASE and CONSTITUENT statements as written

AlCu-21Kro.tdb: AL3CU4_LT, type code %, sha256 bd06016e51db2bef…

61: PHASE AL3CU4_LT % 2 0.427 0.573 !
62: CONST AL3CU4_LT : AL% CU : CU : !

Example references (1 of 1; assessments first):

doi:10.1007/s10853-020-05423-7 Aleš Kroupa, Ondřej Zobač, Klaus W. Richter, The thermodynamic reassessment of the binary Al–Cu system, J Mater Sci 56, 3430-3443 (2021).
assessment that models this phase

AL4CU9_D82 (Al–Cu)

Id: phase:al-cu:al4cu9-d82; status assigned
Structure: Cu5Zn8 · D8_2 · cI52 · I-43m (217); type st:d8-2-cu5zn8-ci52; tier A: standard phase name; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 1054.21–1293.41 K, x(Cu) 0.65575–0.68881
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:al-cu:al4cu9-d82
tdb: tdb:AlCu-04Wit.tdb:AL4CU9_D82, tdb:AlCu-98Sau-LB.tdb:AL4CU9_D82

TDB models of AL4CU9_D82 (2): PHASE and CONSTITUENT statements as written

AlCu-04Wit.tdb: AL4CU9_D82, type code %, sha256 7239fc4da5e79f40…

99: PHASE AL4CU9_D82 % 3 4 1 8 !
100: CONST AL4CU9_D82 : AL : AL CU% : CU : !

AlCu-98Sau-LB.tdb: AL4CU9_D82, type code %, sha256 bed1eea6f6cf10b8…

96: PHASE AL4CU9_D82 % 3 4 1 8 !
97: CONST AL4CU9_D82 : AL : AL CU% : CU : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2004.04.126 V.T. Witusiewicz, U. Hecht, S.G. Fries, S. Rex, The Ag–Al–Cu system, Journal of Alloys and Compounds 385, 133-143 (2004).
assessment that models this phase

AL4CU9_D83 (Al–Cu)

Id: phase:al-cu:al4cu9-d83; status assigned
Structure: Al4Cu9 · D8_3 · cP52 · P-43m (215); type st:d8-3-al4cu9-cp52; tier A: standard phase name; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 300–1150.5 K, x(Cu) 0.62135–0.69231
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:al-cu:al4cu9-d83
tdb: tdb:AlCu-04Wit.tdb:AL4CU9_D83, tdb:AlCu-98Sau-LB.tdb:AL4CU9_D83

TDB models of AL4CU9_D83 (2): PHASE and CONSTITUENT statements as written

AlCu-04Wit.tdb: AL4CU9_D83, type code %, sha256 7239fc4da5e79f40…

94: PHASE AL4CU9_D83 % 3 4 1 8 !
95: CONST AL4CU9_D83 : AL : AL CU% : CU : !

AlCu-98Sau-LB.tdb: AL4CU9_D83, type code %, sha256 bed1eea6f6cf10b8…

91: PHASE AL4CU9_D83 % 3 4 1 8 !
92: CONST AL4CU9_D83 : AL : AL CU% : CU : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2004.04.126 V.T. Witusiewicz, U. Hecht, S.G. Fries, S. Rex, The Ag–Al–Cu system, Journal of Alloys and Compounds 385, 133-143 (2004).
assessment that models this phase

AL4CU9_GAMMA (Al–Cu)

Id: phase:al-cu:al4cu9-gamma; status needs_review
No structure assigned. Why: no_structure_token; off_stoichiometric_model; sgte_mmc2_rows_disagree
Candidate (dft_mp): P-43m (215) — on-hull MP Al4Cu9 at x(CU)=0.6923
Candidate (dft_oqmd): P-43m (215) — on-hull OQMD Al4 Cu9 at x(CU)=0.6923
Candidate (literature_printed): Al4Cu9 · cP52 — printed with a label mapped to this phase
Candidate (sgte_mmc2): Cu5Zn8 · D8_2 · cI52 · I-43m (217) — Hallstedt 2025 mmc2 row for AL4CU9_GAMMA: Al4Cu9 (gamma-0, gamma-2, high T)
Candidate (sgte_mmc2): Al4Cu9 · D8_3 · cP52 · P-43m (215) — Hallstedt 2025 mmc2 row for AL4CU9_GAMMA: Al4Cu9 (gamma-1, low-T)
Candidate (tdb_comment): Al4Cu9 · cP52 · P-43m — AlCu-02Mie.tdb: 'Prototype Al4Cu9 (cP52, P-43m) gamma-1'
Candidate (tdb_comment): Cu5Zn8 · cI52 · I-43m — AlCu-02Mie.tdb: 'Prototype Cu5Zn8 (cI52, I-43m) gamma-0'
Stability: stable in 1 of 1 calculated diagram(s): 300–1293.77 K, x(Cu) 0.61724–0.70148
Literature: 11 values (11 accepted) from 2 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:al-cu:al4cu9-gamma
paper: paper:10.1007/s11661-002-0173-7:γ, paper:sha256-85fd53a1a176b694:AlCu-γ(D83)
tdb: tdb:AlCu-02Mie.tdb:AL4CU9_GAMMA

TDB models of AL4CU9_GAMMA (1): PHASE and CONSTITUENT statements as written

AlCu-02Mie.tdb: AL4CU9_GAMMA, type code %, sha256 3831fc8d892fc077…

44: PHASE AL4CU9_GAMMA % 1 1 !
45: CONST AL4CU9_GAMMA : AL CU : !

Example references (2 of 2; assessments first):

doi:10.1007/s11661-002-0173-7 J. Miettinen, Thermodynamic description of the Cu-Al-Sn system in the copper-rich corner, Metall Mater Trans A 33, 1639-1648 (2002).
assessment that models this phase; reports values for this phase
doi:10.1179/imr.1985.30.1.211 J. L. Murray, The aluminium-copper system, International Materials Reviews 30, 211-234 (1985).
cited as the source of values for this phase

AL5CU8 (Al–Cu)

Id: phase:al-cu:al5cu8; status assigned
Structure: Al5Cu8 · hR52 · R3m (160); type st:al5cu8-hr52; tier C: assessor-stated (Hallstedt 2025 crystallographic table); confidence assessor-stated
Structure source: B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, supplementary crystallographic table (mmc2) doi:10.1016/j.calphad.2025.102833
Caveat: not certain from the name or DFT alone (no_structure_token, off_stoichiometric_model); structure as stated in the SGTE crystallographic table for this phase name and system
Stability: stable in 2 of 2 calculated diagram(s): 300–960 K, x(Cu) 0.59596–0.61545
Literature: 9 values (9 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:al-cu:al5cu8
paper: paper:10.1007/s10853-020-05423-7:δ
tdb: tdb:AlCu-15Lia.tdb:AL5CU8, tdb:AlCu-21Kro.tdb:AL5CU8

TDB models of AL5CU8 (2): PHASE and CONSTITUENT statements as written

AlCu-15Lia.tdb: AL5CU8, type code %, sha256 cc9baa9f2479820c…

77: PHASE AL5CU8 % 2 5 8 !
78: CONST AL5CU8 : AL : CU : !

AlCu-21Kro.tdb: AL5CU8, type code %, sha256 bd06016e51db2bef…

77: PHASE AL5CU8 % 2 5 8 !
78: CONST AL5CU8 : AL% CU : AL CU% : !

Example references (3 of 3; assessments first):

doi:10.1007/s10853-020-05423-7 Aleš Kroupa, Ondřej Zobač, Klaus W. Richter, The thermodynamic reassessment of the binary Al–Cu system, J Mater Sci 56, 3430-3443 (2021).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2015.10.004 Liang SM, Schmid-Fetzer R (2015) Thermodynamic assessment of the Al–Cu–Zn system, part II: Al–Cu binary system. CALPHAD 51:252–260
assessment that models this phase; cited as the source of values for this phase
doi:10.1016/j.intermet.2011.07.007 Norbert Ponweiser, Christian L. Lengauer, Klaus W. Richter, Re-investigation of phase equilibria in the system Al–Cu and structural analysis of the high-temperature phase η1-Al1−δCu, Intermetallics 19, 1737-1746 (2011).
cited as the source of values for this phase

AL9CU11 (Al–Cu)

Id: phase:al-cu:al9cu11; status needs_review
No structure assigned. Why: no_structure_token; off_stoichiometric_model; sgte_mmc2_rows_disagree
Candidate (sgte_mmc2): Al3Cu4(h) · oF88 · Fmm2 (42) — Hallstedt 2025 mmc2 row for AL9CU11: Al9Cu11 (zeta-1, high T)
Candidate (sgte_mmc2): Al3Cu4(r) · oI24 · Imm2 (44) — Hallstedt 2025 mmc2 row for AL9CU11: Al9Cu11 (zeta-2, low T)
Candidate (tdb_comment): Al9Cu11(h) · oF88 · Fmm2 — AlCu-04Wit.tdb: 'Prototype Al9Cu11(h) (oF88, Fmm2), zeta-1, high T'
Candidate (tdb_comment): Al9Cu11(r) · oI24 · Imm2 — AlCu-04Wit.tdb: 'Prototype Al9Cu11(r) (oI24, Imm2), zeta-2, low T'
Candidate (tdb_comment): Al9Cu11(h) · oF88 · Fmm2 — AlCu-15Lia.tdb: 'Prototype Al9Cu11(h) (oF88, Fmm2), zeta-1, high T'
Candidate (tdb_comment): Al9Cu11(r) · oI24 · Imm2 — AlCu-15Lia.tdb: 'Prototype Al9Cu11(r) (oI24, Imm2), zeta-2, low T'
Candidate (tdb_comment): Al9Cu11(h) · oF88 · Fmm2 — AlCu-98Sau-LB.tdb: 'Prototype Al9Cu11(h) (oF88, Fmm2), zeta-1, high T'
Candidate (tdb_comment): Al9Cu11(r) · oI24 · Imm2 — AlCu-98Sau-LB.tdb: 'Prototype Al9Cu11(r) (oI24, Imm2), zeta-2, low T'
Stability: stable in 3 of 3 calculated diagram(s): 300–874.57 K, x(Cu) 0.55–0.5574
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:al-cu:al9cu11
tdb: tdb:AlCu-04Wit.tdb:AL9CU11, tdb:AlCu-15Lia.tdb:AL9CU11, tdb:AlCu-98Sau-LB.tdb:AL9CU11

TDB models of AL9CU11 (3): PHASE and CONSTITUENT statements as written

AlCu-04Wit.tdb: AL9CU11, type code %, sha256 7239fc4da5e79f40…

78: PHASE AL9CU11 % 2 9 11 !
79: CONST AL9CU11 : AL : CU : !

AlCu-15Lia.tdb: AL9CU11, type code %, sha256 cc9baa9f2479820c…

66: PHASE AL9CU11 % 2 9 11 !
67: CONST AL9CU11 : AL% CU : CU : !

AlCu-98Sau-LB.tdb: AL9CU11, type code %, sha256 bed1eea6f6cf10b8…

75: PHASE AL9CU11 % 2 9 11 !
76: CONST AL9CU11 : AL : CU : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2015.10.004 Liang SM, Schmid-Fetzer R (2015) Thermodynamic assessment of the Al–Cu–Zn system, part II: Al–Cu binary system. CALPHAD 51:252–260
assessment that models this phase
doi:10.1016/j.jallcom.2004.04.126 V.T. Witusiewicz, U. Hecht, S.G. Fries, S. Rex, The Ag–Al–Cu system, Journal of Alloys and Compounds 385, 133-143 (2004).
assessment that models this phase

ALCU_ETA_1 (Al–Cu)

Id: phase:al-cu:alcu-1-eta; status assigned
Structure: AlCu(h) · oC32 · Cmmm (65); type st:alcu-h-oc32; tier C: assessor-stated (Hallstedt 2025 crystallographic table); confidence assessor-stated
Structure source: B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, supplementary crystallographic table (mmc2) doi:10.1016/j.calphad.2025.102833
Caveat: not certain from the name or DFT alone (name_has_descriptive_tokens:1, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stability: stable in 1 of 1 calculated diagram(s): 846.87–898.18 K, x(Cu) 0.50891–0.51225
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:al-cu:alcu-1-eta
tdb: tdb:AlCu-15Lia.tdb:ALCU_ETA_1

TDB models of ALCU_ETA_1 (1): PHASE and CONSTITUENT statements as written

AlCu-15Lia.tdb: ALCU_ETA_1, type code %, sha256 cc9baa9f2479820c…

55: PHASE ALCU_ETA_1 % 2 1 1 !
56: CONST ALCU_ETA_1 : AL% CU : CU : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2015.10.004 Liang SM, Schmid-Fetzer R (2015) Thermodynamic assessment of the Al–Cu–Zn system, part II: Al–Cu binary system. CALPHAD 51:252–260
assessment that models this phase

ALCU_ETA_2 (Al–Cu)

Id: phase:al-cu:alcu-2-eta; status needs_review
No structure assigned. Why: assessment_declared_compound_differs_from_model_composition; name_has_descriptive_tokens:2; no_structure_token
Candidate (sgte_mmc2): AlCu(r) · mC20 · C2/m (12) — Hallstedt 2025 mmc2 row for ALCU_ETA_2: AlCu (eta-2, low T)
Candidate (tdb_comment): AlCu(r) · mC20 · C2/m — AlCu-15Lia.tdb: 'Prototype AlCu(r) (mC20, C2/m), low T'
Stoichiometry: Al 0.4800, Cu 0.5200
Stability: stable in 1 of 1 calculated diagram(s): 300–871.03 K, x(Cu) 0.52–0.52
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:al-cu:alcu-2-eta
tdb: tdb:AlCu-15Lia.tdb:ALCU_ETA_2

TDB models of ALCU_ETA_2 (1): PHASE and CONSTITUENT statements as written

AlCu-15Lia.tdb: ALCU_ETA_2, type code %, sha256 cc9baa9f2479820c…

60: PHASE ALCU_ETA_2 % 2 0.48 0.52 !
61: CONST ALCU_ETA_2 : AL : CU : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2015.10.004 Liang SM, Schmid-Fetzer R (2015) Thermodynamic assessment of the Al–Cu–Zn system, part II: Al–Cu binary system. CALPHAD 51:252–260
assessment that models this phase

ALCU_B82 (Al–Cu)

Id: phase:al-cu:alcu-b82; status needs_review
No structure assigned. Why: site_ratios_contradict_B8_2:AlCu-04Wit.tdb; site_ratios_contradict_B8_2:AlCu-15Lia.tdb; site_ratios_contradict_B8_2:AlCu-21Kro.tdb; site_ratios_contradict_B8_2:AlCu-98Sau-LB.tdb
Candidate (dft_oqmd): C2/m (12) — on-hull OQMD Al9 Cu13 at x(CU)=0.5909
Candidate (name_token): InNi2 · B8_2 · hP6 · P6_3/mmc (194) — Strukturbericht/word 'B82' in the TDB name
Candidate (sgte_mmc2): InNi2 · B8_2 · hP6 · P6_3/mmc (194) — Hallstedt 2025 mmc2 row for ALCU_B82: AlCu-epsilon-2 (Al2Cu3)
Candidate (tdb_comment): InNi2 · hP6 · P6_3/mmc — AlCu-04Wit.tdb: 'Prototype InNi2 (hP6, P6_3/mmc), epsilon-2'
Candidate (tdb_comment): InNi2 · hP6 · P6_3/mmc — AlCu-15Lia.tdb: 'Prototype InNi2 (hP6, P6_3/mmc), epsilon-2'
Candidate (tdb_comment): InNi2 · hP6 · P6_3/mmc — AlCu-21Kro.tdb: 'Prototype InNi2 (hP6, P6_3/mmc), epsilon-2/prime'
Candidate (tdb_comment): InNi2 · hP6 · P6_3/mmc — AlCu-98Sau-LB.tdb: 'Prototype InNi2 (hP6, P6_3/mmc), epsilon-2'
Stability: stable in 4 of 4 calculated diagram(s): 830.82–1124.24 K, x(Cu) 0.5403–0.60043
Literature: 28 values (28 accepted) from 1 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:al-cu:alcu-b82
paper: paper:10.1007/s10853-020-05423-7:ε′
tdb: tdb:AlCu-04Wit.tdb:ALCU_B82, tdb:AlCu-15Lia.tdb:ALCU_B82, tdb:AlCu-21Kro.tdb:ALCU_B82, tdb:AlCu-98Sau-LB.tdb:ALCU_B82

TDB models of ALCU_B82 (4): PHASE and CONSTITUENT statements as written

AlCu-04Wit.tdb: ALCU_B82, type code %, sha256 7239fc4da5e79f40…

83: PHASE ALCU_B82 % 2 1 1 !
84: CONST ALCU_B82 : AL% CU : CU : !

AlCu-15Lia.tdb: ALCU_B82, type code %, sha256 cc9baa9f2479820c…

71: PHASE ALCU_B82 % 2 1 1 !
72: CONST ALCU_B82 : AL% CU : CU : !

AlCu-21Kro.tdb: ALCU_B82, type code %, sha256 bd06016e51db2bef…

71: PHASE ALCU_B82 % 2 1 1 !
72: CONST ALCU_B82 : AL% CU : CU : !

AlCu-98Sau-LB.tdb: ALCU_B82, type code %, sha256 bed1eea6f6cf10b8…

80: PHASE ALCU_B82 % 2 1 1 !
81: CONST ALCU_B82 : AL% CU : CU : !

Example references (4 of 4; assessments first):

doi:10.1007/s10853-020-05423-7 Aleš Kroupa, Ondřej Zobač, Klaus W. Richter, The thermodynamic reassessment of the binary Al–Cu system, J Mater Sci 56, 3430-3443 (2021).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2015.10.004 Liang SM, Schmid-Fetzer R (2015) Thermodynamic assessment of the Al–Cu–Zn system, part II: Al–Cu binary system. CALPHAD 51:252–260
assessment that models this phase; cited as the source of values for this phase
doi:10.1016/j.jallcom.2004.04.126 V.T. Witusiewicz, U. Hecht, S.G. Fries, S. Rex, The Ag–Al–Cu system, Journal of Alloys and Compounds 385, 133-143 (2004).
assessment that models this phase
doi:10.1016/j.intermet.2011.07.007 Norbert Ponweiser, Christian L. Lengauer, Klaus W. Richter, Re-investigation of phase equilibria in the system Al–Cu and structural analysis of the high-temperature phase η1-Al1−δCu, Intermetallics 19, 1737-1746 (2011).
cited as the source of values for this phase

ALCU_ETA (Al–Cu)

Id: phase:al-cu:alcu-eta; status needs_review
No structure assigned. Why: no_structure_token; off_stoichiometric_model; sgte_mmc2_rows_disagree
Candidate (dft_mp): C2/m (12) — on-hull MP AlCu at x(CU)=0.5000
Candidate (dft_oqmd): P-1 (2) — on-hull OQMD Al1 Cu1 at x(CU)=0.5000
Candidate (sgte_mmc2): AlCu(h) · oC32 · Cmmm (65) — Hallstedt 2025 mmc2 row for ALCU_ETA: AlCu (eta-1, high T)
Candidate (sgte_mmc2): AlCu(r) · mC20 · C2/m (12) — Hallstedt 2025 mmc2 row for ALCU_ETA: AlCu (eta-2, low T)
Candidate (tdb_comment): AlCu(h) · oC32 · Cmmm — AlCu-04Wit.tdb: 'Prototype AlCu(h) (oC32, Cmmm), eta-1, high T'
Candidate (tdb_comment): AlCu(r) · mC20 · C2/m — AlCu-04Wit.tdb: 'Prototype AlCu(r) (mC20, C2/m), eta-2, low T'
Candidate (tdb_comment): AlCu(h) · oC32 · Cmmm — AlCu-98Sau-LB.tdb: 'Prototype AlCu(h) (oC32, Cmmm), eta-1, high T'
Candidate (tdb_comment): AlCu(r) · mC20 · C2/m — AlCu-98Sau-LB.tdb: 'Prototype AlCu(r) (mC20, C2/m), eta-2, low T'
Stability: stable in 2 of 2 calculated diagram(s): 300–898.11 K, x(Cu) 0.5–0.51097
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:al-cu:alcu-eta
tdb: tdb:AlCu-04Wit.tdb:ALCU_ETA, tdb:AlCu-98Sau-LB.tdb:ALCU_ETA

TDB models of ALCU_ETA (2): PHASE and CONSTITUENT statements as written

AlCu-04Wit.tdb: ALCU_ETA, type code %, sha256 7239fc4da5e79f40…

72: PHASE ALCU_ETA % 2 1 1 !
73: CONST ALCU_ETA : AL% CU : CU : !

AlCu-98Sau-LB.tdb: ALCU_ETA, type code %, sha256 bed1eea6f6cf10b8…

69: PHASE ALCU_ETA % 2 1 1 !
70: CONST ALCU_ETA : AL% CU : CU : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2004.04.126 V.T. Witusiewicz, U. Hecht, S.G. Fries, S. Rex, The Ag–Al–Cu system, Journal of Alloys and Compounds 385, 133-143 (2004).
assessment that models this phase

ALCU_ETA_HT (Al–Cu)

Id: phase:al-cu:alcu-eta-ht; status assigned
Structure: AlCu(h) · oC32 · Cmmm (65); type st:alcu-h-oc32; tier C: assessor-stated (Hallstedt 2025 crystallographic table); confidence assessor-stated
Structure source: B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, supplementary crystallographic table (mmc2) doi:10.1016/j.calphad.2025.102833
Caveat: not certain from the name or DFT alone (no_structure_token, off_stoichiometric_model); structure as stated in the SGTE crystallographic table for this phase name and system
Stability: stable in 1 of 1 calculated diagram(s): 846.77–897.67 K, x(Cu) 0.51175–0.5165
Literature: 17 values (15 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:al-cu:alcu-eta-ht
paper: paper:10.1007/s10853-020-05423-7:η
tdb: tdb:AlCu-21Kro.tdb:ALCU_ETA_HT

TDB models of ALCU_ETA_HT (1): PHASE and CONSTITUENT statements as written

AlCu-21Kro.tdb: ALCU_ETA_HT, type code %, sha256 bd06016e51db2bef…

56: PHASE ALCU_ETA_HT % 2 1 1 !
57: CONST ALCU_ETA_HT : AL% CU : CU : !

Example references (3 of 3; assessments first):

doi:10.1007/s10853-020-05423-7 Aleš Kroupa, Ondřej Zobač, Klaus W. Richter, The thermodynamic reassessment of the binary Al–Cu system, J Mater Sci 56, 3430-3443 (2021).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2015.10.004 Liang SM, Schmid-Fetzer R (2015) Thermodynamic assessment of the Al–Cu–Zn system, part II: Al–Cu binary system. CALPHAD 51:252–260
cited as the source of values for this phase
doi:10.1016/j.intermet.2011.07.007 Norbert Ponweiser, Christian L. Lengauer, Klaus W. Richter, Re-investigation of phase equilibria in the system Al–Cu and structural analysis of the high-temperature phase η1-Al1−δCu, Intermetallics 19, 1737-1746 (2011).
cited as the source of values for this phase

ALCU_ETA_LT (Al–Cu)

Id: phase:al-cu:alcu-eta-lt; status assigned
Structure: AlCu(r) · mC20 · C2/m (12); type st:alcu-r-mc20; tier C: assessor-stated (Hallstedt 2025 crystallographic table); confidence assessor-stated
Structure source: B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, supplementary crystallographic table (mmc2) doi:10.1016/j.calphad.2025.102833
Caveat: not certain from the name or DFT alone (no_structure_token, off_stoichiometric_model); structure as stated in the SGTE crystallographic table for this phase name and system
Stability: stable in 1 of 1 calculated diagram(s): 300–871.89 K, x(Cu) 0.5–0.53158
Literature: 11 values (9 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:al-cu:alcu-eta-lt
paper: paper:10.1007/s10853-020-05423-7:η′
tdb: tdb:AlCu-21Kro.tdb:ALCU_ETA_LT

TDB models of ALCU_ETA_LT (1): PHASE and CONSTITUENT statements as written

AlCu-21Kro.tdb: ALCU_ETA_LT, type code %, sha256 bd06016e51db2bef…

50: PHASE ALCU_ETA_LT % 2 1 1 !
51: CONST ALCU_ETA_LT : AL% CU : CU : !

Example references (3 of 3; assessments first):

doi:10.1007/s10853-020-05423-7 Aleš Kroupa, Ondřej Zobač, Klaus W. Richter, The thermodynamic reassessment of the binary Al–Cu system, J Mater Sci 56, 3430-3443 (2021).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2015.10.004 Liang SM, Schmid-Fetzer R (2015) Thermodynamic assessment of the Al–Cu–Zn system, part II: Al–Cu binary system. CALPHAD 51:252–260
cited as the source of values for this phase
doi:10.1016/j.intermet.2011.07.007 Norbert Ponweiser, Christian L. Lengauer, Klaus W. Richter, Re-investigation of phase equilibria in the system Al–Cu and structural analysis of the high-temperature phase η1-Al1−δCu, Intermetallics 19, 1737-1746 (2011).
cited as the source of values for this phase

ALCU3_D022 (Al–Cu)

Id: phase:al-cu:alcu3-d022; status needs_review
No structure assigned. Why: assessment_declared_blocked_by:stoichiometry_contradicts_D0_22; stoichiometry_contradicts_D0_22:AlCu-15Lia.tdb; stoichiometry_contradicts_D0_22:AlCu-21Kro.tdb
Candidate (name_token): Al3Ti · D0_22 · tI8 · I4/mmm (139) — Strukturbericht/word 'D022' in the TDB name
Candidate (sgte_mmc2): Al3Ti · D0_22 · tI8 · I4/mmm (139) — Hallstedt 2025 mmc2 row for ALCU3_D022: AlCu3
Candidate (tdb_comment): Al3Ti · tI8 · I4/mmm — AlCu-15Lia.tdb: 'Prototype Al3Ti (tI8, I4/mmm) alpha-2'
Candidate (tdb_comment): Al3Ti · tI8 · I4/mmm — AlCu-21Kro.tdb: 'Prototype Al3Ti (tI8, I4/mmm), alpha-2/prime'
Stoichiometry: Al 0.2300, Cu 0.7700
Stability: stable in 2 of 2 calculated diagram(s): 300–640 K, x(Cu) 0.77–0.77
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:al-cu:alcu3-d022
tdb: tdb:AlCu-15Lia.tdb:ALCU3_D022, tdb:AlCu-21Kro.tdb:ALCU3_D022

TDB models of ALCU3_D022 (2): PHASE and CONSTITUENT statements as written

AlCu-15Lia.tdb: ALCU3_D022, type code %, sha256 cc9baa9f2479820c…

92: PHASE ALCU3_D022 % 2 0.23 0.77 !
93: CONST ALCU3_D022 : AL : CU : !

AlCu-21Kro.tdb: ALCU3_D022, type code %, sha256 bd06016e51db2bef…

92: PHASE ALCU3_D022 % 2 0.23 0.77 !
93: CONST ALCU3_D022 : AL : CU : !

Example references (2 of 2; assessments first):

doi:10.1007/s10853-020-05423-7 Aleš Kroupa, Ondřej Zobač, Klaus W. Richter, The thermodynamic reassessment of the binary Al–Cu system, J Mater Sci 56, 3430-3443 (2021).
assessment that models this phase
doi:10.1016/j.calphad.2015.10.004 Liang SM, Schmid-Fetzer R (2015) Thermodynamic assessment of the Al–Cu–Zn system, part II: Al–Cu binary system. CALPHAD 51:252–260
assessment that models this phase

BCC_A2 (Al–Cu)

Id: phase:al-cu:bcc-a2; status assigned
Structure: W · A2 · cI2 · Im-3m (229); type st:a2-w-ci2; tier A: standard phase name; confidence high
Stability: stable in 5 of 5 calculated diagram(s): 300–1329.45 K, x(Cu) 0.32085–0.81606
Literature: 38 values (35 accepted) from 3 papers
Interactive: phase registry entry

Names (11): corpus: corpus:phase:al-cu:bcc-a2
paper: paper:10.1007/s10853-020-05423-7:β, paper:10.1007/s11661-002-0173-7:Bcc, paper:10.1007/s11661-002-0173-7:bcc, paper:sha256-85fd53a1a176b694:bcc-A2
system_alias: system_alias:al-cu:beta
tdb: tdb:AlCu-02Mie.tdb:BCC_A2, tdb:AlCu-04Wit.tdb:BCC_A2, tdb:AlCu-15Lia.tdb:BCC_A2, tdb:AlCu-21Kro.tdb:BCC_A2, tdb:AlCu-98Sau-LB.tdb:BCC_A2

TDB models of BCC_A2 (5): PHASE and CONSTITUENT statements as written

AlCu-02Mie.tdb: BCC_A2, type code %B, sha256 3831fc8d892fc077…

33: PHASE BCC_A2 %B 2 1 3 !
34: CONST BCC_A2 : AL CU : VA : !

AlCu-04Wit.tdb: BCC_A2, type code %B, sha256 7239fc4da5e79f40…

50: PHASE BCC_A2 %B 2 1 3 !
51: CONST BCC_A2 : AL CU : VA : !

AlCu-15Lia.tdb: BCC_A2, type code %B, sha256 cc9baa9f2479820c…

40: PHASE BCC_A2 %B 2 1 3 !
41: CONST BCC_A2 : AL CU : VA : !

AlCu-21Kro.tdb: BCC_A2, type code %B, sha256 bd06016e51db2bef…

35: PHASE BCC_A2 %B 2 1 3 !
36: CONST BCC_A2 : AL CU : VA : !

AlCu-98Sau-LB.tdb: BCC_A2, type code %B, sha256 bed1eea6f6cf10b8…

47: PHASE BCC_A2 %B 2 1 3 !
48: CONST BCC_A2 : AL CU : VA : !

Example references (6 of 6; assessments first):

doi:10.1007/s10853-020-05423-7 Aleš Kroupa, Ondřej Zobač, Klaus W. Richter, The thermodynamic reassessment of the binary Al–Cu system, J Mater Sci 56, 3430-3443 (2021).
assessment that models this phase; reports values for this phase
doi:10.1007/s11661-002-0173-7 J. Miettinen, Thermodynamic description of the Cu-Al-Sn system in the copper-rich corner, Metall Mater Trans A 33, 1639-1648 (2002).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2015.10.004 Liang SM, Schmid-Fetzer R (2015) Thermodynamic assessment of the Al–Cu–Zn system, part II: Al–Cu binary system. CALPHAD 51:252–260
assessment that models this phase; cited as the source of values for this phase
doi:10.1016/j.jallcom.2004.04.126 V.T. Witusiewicz, U. Hecht, S.G. Fries, S. Rex, The Ag–Al–Cu system, Journal of Alloys and Compounds 385, 133-143 (2004).
assessment that models this phase
doi:10.1016/j.intermet.2011.07.007 Norbert Ponweiser, Christian L. Lengauer, Klaus W. Richter, Re-investigation of phase equilibria in the system Al–Cu and structural analysis of the high-temperature phase η1-Al1−δCu, Intermetallics 19, 1737-1746 (2011).
cited as the source of values for this phase
doi:10.1179/imr.1985.30.1.211 J. L. Murray, The aluminium-copper system, International Materials Reviews 30, 211-234 (1985).
cited as the source of values for this phase

GAMMA_D82 (Al–Cu)

Id: phase:al-cu:d82-gamma; status assigned
Structure: Cu5Zn8 · D8_2 · cI52 · I-43m (217); type st:d8-2-cu5zn8-ci52; tier A: standard phase name; confidence high
Caveat: partitioned order/disorder model in AlCu-21Kro.tdb also describes the disordered state
Stability: stable in 2 of 2 calculated diagram(s): 1050.72–1286.31 K, x(Cu) 0.64361–0.69815
Literature: 16 values (16 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:al-cu:d82-gamma, corpus:phase:al-cu:gamma-d82
paper: paper:10.1007/s10853-020-05423-7:γ
tdb: tdb:AlCu-15Lia.tdb:GAMMA_D82, tdb:AlCu-21Kro.tdb:GAMMA_D82

TDB models of GAMMA_D82 (2): PHASE and CONSTITUENT statements as written

AlCu-15Lia.tdb: GAMMA_D82, type code %, sha256 cc9baa9f2479820c…

82: PHASE GAMMA_D82 % 3 4 6 16 !
83: CONST GAMMA_D82 : CU : CU : AL CU : !

AlCu-21Kro.tdb: GAMMA_D82, type code %, sha256 bd06016e51db2bef…

87: PHASE GAMMA_D82 % 4 2 2 3 6 !
88: CONST GAMMA_D82 : AL CU : CU : CU : AL CU : !

Example references (3 of 3; assessments first):

doi:10.1007/s10853-020-05423-7 Aleš Kroupa, Ondřej Zobač, Klaus W. Richter, The thermodynamic reassessment of the binary Al–Cu system, J Mater Sci 56, 3430-3443 (2021).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2015.10.004 Liang SM, Schmid-Fetzer R (2015) Thermodynamic assessment of the Al–Cu–Zn system, part II: Al–Cu binary system. CALPHAD 51:252–260
assessment that models this phase; cited as the source of values for this phase
doi:10.1016/j.intermet.2011.07.007 Norbert Ponweiser, Christian L. Lengauer, Klaus W. Richter, Re-investigation of phase equilibria in the system Al–Cu and structural analysis of the high-temperature phase η1-Al1−δCu, Intermetallics 19, 1737-1746 (2011).
cited as the source of values for this phase

GAMMA_D83 (Al–Cu)

Id: phase:al-cu:d83-gamma; status assigned
Structure: Al4Cu9 · D8_3 · cP52 · P-43m (215); type st:d8-3-al4cu9-cp52; tier A: standard phase name; confidence high
Caveat: partitioned order/disorder model in AlCu-21Kro.tdb also describes the disordered state
Stability: stable in 2 of 2 calculated diagram(s): 300–1145.67 K, x(Cu) 0.62085–0.69906
Literature: 20 values (20 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:al-cu:d83-gamma, corpus:phase:al-cu:gamma-d83
paper: paper:10.1007/s10853-020-05423-7:γ′
tdb: tdb:AlCu-15Lia.tdb:GAMMA_D83, tdb:AlCu-21Kro.tdb:GAMMA_D83

TDB models of GAMMA_D83 (2): PHASE and CONSTITUENT statements as written

AlCu-15Lia.tdb: GAMMA_D83, type code %, sha256 cc9baa9f2479820c…

87: PHASE GAMMA_D83 % 3 4 6 16 !
88: CONST GAMMA_D83 : CU : CU : AL CU : !

AlCu-21Kro.tdb: GAMMA_D83, type code %, sha256 bd06016e51db2bef…

82: PHASE GAMMA_D83 % 4 2 2 3 6 !
83: CONST GAMMA_D83 : AL CU : CU : CU : AL CU : !

Example references (3 of 3; assessments first):

doi:10.1007/s10853-020-05423-7 Aleš Kroupa, Ondřej Zobač, Klaus W. Richter, The thermodynamic reassessment of the binary Al–Cu system, J Mater Sci 56, 3430-3443 (2021).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2015.10.004 Liang SM, Schmid-Fetzer R (2015) Thermodynamic assessment of the Al–Cu–Zn system, part II: Al–Cu binary system. CALPHAD 51:252–260
assessment that models this phase; cited as the source of values for this phase
doi:10.1016/j.intermet.2011.07.007 Norbert Ponweiser, Christian L. Lengauer, Klaus W. Richter, Re-investigation of phase equilibria in the system Al–Cu and structural analysis of the high-temperature phase η1-Al1−δCu, Intermetallics 19, 1737-1746 (2011).
cited as the source of values for this phase

FCC_A1 (Al–Cu)

Id: phase:al-cu:fcc-a1; status assigned
Structure: Cu · A1 · cF4 · Fm-3m (225); type st:a1-cu-cf4; tier A: standard phase name; confidence high
Stability: stable in 5 of 5 calculated diagram(s): 300–1358.62 K, x(Cu) 0–1
Literature: 16 values (16 accepted) from 3 papers
Interactive: phase registry entry

Names (9): corpus: corpus:phase:al-cu:fcc-a1
paper: paper:10.1007/s10853-020-05423-7:(Cu), paper:10.1007/s11661-002-0173-7:Fcc, paper:sha256-85fd53a1a176b694:fcc-A1
tdb: tdb:AlCu-02Mie.tdb:FCC_A1, tdb:AlCu-04Wit.tdb:FCC_A1, tdb:AlCu-15Lia.tdb:FCC_A1, tdb:AlCu-21Kro.tdb:FCC_A1, tdb:AlCu-98Sau-LB.tdb:FCC_A1

TDB models of FCC_A1 (5): PHASE and CONSTITUENT statements as written

AlCu-02Mie.tdb: FCC_A1, type code %A, sha256 3831fc8d892fc077…

28: PHASE FCC_A1 %A 2 1 1 !
29: CONST FCC_A1 : AL CU : VA : !

AlCu-04Wit.tdb: FCC_A1, type code %A, sha256 7239fc4da5e79f40…

45: PHASE FCC_A1 %A 2 1 1 !
46: CONST FCC_A1 : AL% CU% : VA : !

AlCu-15Lia.tdb: FCC_A1, type code %A, sha256 cc9baa9f2479820c…

35: PHASE FCC_A1 %A 2 1 1 !
36: CONST FCC_A1 : AL% CU% : VA : !

AlCu-21Kro.tdb: FCC_A1, type code %A, sha256 bd06016e51db2bef…

30: PHASE FCC_A1 %A 2 1 1 !
31: CONST FCC_A1 : AL% CU% : VA : !

AlCu-98Sau-LB.tdb: FCC_A1, type code %A, sha256 bed1eea6f6cf10b8…

42: PHASE FCC_A1 %A 2 1 1 !
43: CONST FCC_A1 : AL% CU% : VA : !

Example references (6 of 6; assessments first):

doi:10.1007/s10853-020-05423-7 Aleš Kroupa, Ondřej Zobač, Klaus W. Richter, The thermodynamic reassessment of the binary Al–Cu system, J Mater Sci 56, 3430-3443 (2021).
assessment that models this phase; reports values for this phase
doi:10.1007/s11661-002-0173-7 J. Miettinen, Thermodynamic description of the Cu-Al-Sn system in the copper-rich corner, Metall Mater Trans A 33, 1639-1648 (2002).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2015.10.004 Liang SM, Schmid-Fetzer R (2015) Thermodynamic assessment of the Al–Cu–Zn system, part II: Al–Cu binary system. CALPHAD 51:252–260
assessment that models this phase; cited as the source of values for this phase
doi:10.1016/j.jallcom.2004.04.126 V.T. Witusiewicz, U. Hecht, S.G. Fries, S. Rex, The Ag–Al–Cu system, Journal of Alloys and Compounds 385, 133-143 (2004).
assessment that models this phase
doi:10.1016/j.intermet.2011.07.007 Norbert Ponweiser, Christian L. Lengauer, Klaus W. Richter, Re-investigation of phase equilibria in the system Al–Cu and structural analysis of the high-temperature phase η1-Al1−δCu, Intermetallics 19, 1737-1746 (2011).
cited as the source of values for this phase
doi:10.1179/imr.1985.30.1.211 J. L. Murray, The aluminium-copper system, International Materials Reviews 30, 211-234 (1985).
cited as the source of values for this phase

HCP_A3 (Al–Cu)

Id: phase:al-cu:hcp-a3; status assigned
Structure: Mg · A3 · hP2 · P6_3/mmc (194); type st:a3-mg-hp2; tier A: standard phase name; confidence high
Stability: stable in 1 of 5 calculated diagram(s): 747.05–1015.23 K, x(Cu) 0.26592–0.37287
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:al-cu:hcp-a3
tdb: tdb:AlCu-02Mie.tdb:HCP_A3, tdb:AlCu-04Wit.tdb:HCP_A3, tdb:AlCu-15Lia.tdb:HCP_A3, tdb:AlCu-21Kro.tdb:HCP_A3, tdb:AlCu-98Sau-LB.tdb:HCP_A3

TDB models of HCP_A3 (5): PHASE and CONSTITUENT statements as written

AlCu-02Mie.tdb: HCP_A3, type code %A, sha256 3831fc8d892fc077…

38: PHASE HCP_A3 %A 2 1 0.5 !
39: CONST HCP_A3 : AL CU : VA : !

AlCu-04Wit.tdb: HCP_A3, type code %A, sha256 7239fc4da5e79f40…

55: PHASE HCP_A3 %A 2 1 0.5 !
56: CONST HCP_A3 : AL CU : VA : !

AlCu-15Lia.tdb: HCP_A3, type code %A, sha256 cc9baa9f2479820c…

45: PHASE HCP_A3 %A 2 1 0.5 !
46: CONST HCP_A3 : AL CU : VA : !

AlCu-21Kro.tdb: HCP_A3, type code %A, sha256 bd06016e51db2bef…

40: PHASE HCP_A3 %A 2 1 0.5 !
41: CONST HCP_A3 : AL CU : VA : !

AlCu-98Sau-LB.tdb: HCP_A3, type code %A, sha256 bed1eea6f6cf10b8…

52: PHASE HCP_A3 %A 2 1 0.5 !
53: CONST HCP_A3 : AL CU : VA : !

Example references (4 of 4; assessments first):

doi:10.1007/s10853-020-05423-7 Aleš Kroupa, Ondřej Zobač, Klaus W. Richter, The thermodynamic reassessment of the binary Al–Cu system, J Mater Sci 56, 3430-3443 (2021).
assessment that models this phase
doi:10.1007/s11661-002-0173-7 J. Miettinen, Thermodynamic description of the Cu-Al-Sn system in the copper-rich corner, Metall Mater Trans A 33, 1639-1648 (2002).
assessment that models this phase
doi:10.1016/j.calphad.2015.10.004 Liang SM, Schmid-Fetzer R (2015) Thermodynamic assessment of the Al–Cu–Zn system, part II: Al–Cu binary system. CALPHAD 51:252–260
assessment that models this phase
doi:10.1016/j.jallcom.2004.04.126 V.T. Witusiewicz, U. Hecht, S.G. Fries, S. Rex, The Ag–Al–Cu system, Journal of Alloys and Compounds 385, 133-143 (2004).
assessment that models this phase

LIQUID (Al–Cu)

Id: phase:al-cu:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 5 of 5 calculated diagram(s): 820.61–2500 K, x(Cu) 0–1
Literature: 42 values (39 accepted) from 3 papers
Interactive: phase registry entry

Names (10): corpus: corpus:phase:al-cu:liquid
paper: paper:10.1007/s10853-020-05423-7:liq, paper:10.1007/s10853-020-05423-7:liq., paper:10.1007/s11661-002-0173-7:L, paper:sha256-85fd53a1a176b694:Liquid
tdb: tdb:AlCu-02Mie.tdb:LIQUID, tdb:AlCu-04Wit.tdb:LIQUID, tdb:AlCu-15Lia.tdb:LIQUID, tdb:AlCu-21Kro.tdb:LIQUID, tdb:AlCu-98Sau-LB.tdb:LIQUID

TDB models of LIQUID (5): PHASE and CONSTITUENT statements as written

AlCu-02Mie.tdb: LIQUID, type code %, sha256 3831fc8d892fc077…

23: PHASE LIQUID:L % 1 1 !
24: CONST LIQUID:L : AL CU : !

AlCu-04Wit.tdb: LIQUID, type code %, sha256 7239fc4da5e79f40…

40: PHASE LIQUID:L % 1 1 !
41: CONST LIQUID:L : AL CU : !

AlCu-15Lia.tdb: LIQUID, type code %, sha256 cc9baa9f2479820c…

30: PHASE LIQUID:L % 1 1 !
31: CONST LIQUID:L : AL CU : !

AlCu-21Kro.tdb: LIQUID, type code %, sha256 bd06016e51db2bef…

25: PHASE LIQUID:L % 1 1 !
26: CONST LIQUID:L : AL CU : !

AlCu-98Sau-LB.tdb: LIQUID, type code %, sha256 bed1eea6f6cf10b8…

37: PHASE LIQUID:L % 1 1 !
38: CONST LIQUID:L : AL CU : !

Example references (6 of 6; assessments first):

doi:10.1007/s10853-020-05423-7 Aleš Kroupa, Ondřej Zobač, Klaus W. Richter, The thermodynamic reassessment of the binary Al–Cu system, J Mater Sci 56, 3430-3443 (2021).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2015.10.004 Liang SM, Schmid-Fetzer R (2015) Thermodynamic assessment of the Al–Cu–Zn system, part II: Al–Cu binary system. CALPHAD 51:252–260
assessment that models this phase; cited as the source of values for this phase
doi:10.1007/s11661-002-0173-7 J. Miettinen, Thermodynamic description of the Cu-Al-Sn system in the copper-rich corner, Metall Mater Trans A 33, 1639-1648 (2002).
assessment that models this phase; reports values for this phase
doi:10.1016/j.jallcom.2004.04.126 V.T. Witusiewicz, U. Hecht, S.G. Fries, S. Rex, The Ag–Al–Cu system, Journal of Alloys and Compounds 385, 133-143 (2004).
assessment that models this phase
doi:10.1016/j.intermet.2011.07.007 Norbert Ponweiser, Christian L. Lengauer, Klaus W. Richter, Re-investigation of phase equilibria in the system Al–Cu and structural analysis of the high-temperature phase η1-Al1−δCu, Intermetallics 19, 1737-1746 (2011).
cited as the source of values for this phase
doi:10.1179/imr.1985.30.1.211 J. L. Murray, The aluminium-copper system, International Materials Reviews 30, 211-234 (1985).
cited as the source of values for this phase

Please cite

R. Arróyave, J. Saal, D. Shin, ORCHID-Registry: phase registry of binary systems (version 2026.10; Version 1, machine-extracted), Zenodo (2026). doi:10.5281/zenodo.23735970
R. Arróyave, J. Saal, D. Shin, ORCHID data: umbrella record of the ORCHID datasets (version 2026.10; Version 1, machine-extracted), Zenodo (2026). doi:10.5281/zenodo.23736065

Also cite B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, https://doi.org/10.1016/j.calphad.2025.102833 (CC BY 4.0), and the original assessment named in each file; A. Jain et al., The Materials Project: A materials genome approach to accelerating materials innovation, APL Materials 1 (2013) 011002, https://doi.org/10.1063/1.4812323 (CC BY 4.0); J. E. Saal et al., JOM 65 (2013) 1501, https://doi.org/10.1007/s11837-013-0755-4 and S. Kirklin et al., npj Comput. Mater. 1 (2015) 15010, https://doi.org/10.1038/npjcompumats.2015.10 (CC BY 4.0); the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work). Version 1, machine-extracted: values were read by language-model readers constrained to quote their source and checked automatically, and the release was then audited on the printed pages by adversarial audits, an independent second review of fit-facing records and a preliminary human review of a frozen sample. Flags such as accepted and ESPEI-ready record screening results, not certification; known issues are listed in the release notes.

@misc{orchid_phase_registry_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Registry: phase registry of binary systems}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735970},
  url       = {https://doi.org/10.5281/zenodo.23735970},
  note      = {Version 1, machine-extracted}
}

@misc{orchid_data_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID data: umbrella record of the ORCHID datasets}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23736065},
  url       = {https://doi.org/10.5281/zenodo.23736065},
  note      = {Version 1, machine-extracted}
}