Al–W phases

10 phases (tier A 4, tier B 2, tier C 1, liquid 1, needs_review 2); 9 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–W system page · Markdown · field reference

Phases of the Al–W system (10)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
AL12W phase:al-w:al12w	Al12W · cI26 · Im-3 (204)	tier B: DFT-supported (unique MP + OQMD match)	stable in 2 of 2 calculated diagram(s): 300–970.23 K, x(W) 0.07692–0.07692	11	2
AL2W_C40 phase:al-w:al2w-c40	CrSi2 · C40 · hP9 · P6_222 (180)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 1199.74–1939.31 K, x(W) 0.33333–0.33333	10	2
AL4W phase:al-w:al4w	Al4W · mC30 · Cm (8)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 2 of 2 calculated diagram(s): 300–1620.87 K, x(W) 0.2–0.2	10	2
AL5W phase:al-w:al5w	Al5W · hP12 · P6_322 (182)	tier B: DFT-supported (unique MP + OQMD match)	stable in 2 of 2 calculated diagram(s): 300–1149.59 K, x(W) 0.16667–0.16667	10	2
AL77W23 phase:al-w:al77w23		needs_review	stable in 1 of 1 calculated diagram(s): 1571.03–1648.23 K, x(W) 0.23–0.23	4	1
AL7W3 phase:al-w:al7w3		needs_review	stable in 1 of 1 calculated diagram(s): 1580.05–1706.83 K, x(W) 0.3–0.3	4	1
BCC_A2 phase:al-w:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–3999.9 K, x(W) 0.83995–1	8	2
FCC_A1 phase:al-w:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–933.6 K, x(W) 0–0.0003	4	2
HCP_A3 phase:al-w:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 2 calculated diagram(s)	0	2
LIQUID phase:al-w:liquid	liquid	liquid	stable in 2 of 2 calculated diagram(s): 918.48–4000 K, x(W) 0–1	22	2

AL12W (Al–W)

Id: phase:al-w:al12w; status assigned
Structure: Al12W · cI26 · Im-3 (204); type st:al12w-ci26; tier B: DFT-supported (unique MP + OQMD match); confidence high
Stoichiometry: Al 0.9231, W 0.0769
Stability: stable in 2 of 2 calculated diagram(s): 300–970.23 K, x(W) 0.07692–0.07692
Literature: 11 values (11 accepted) from 2 papers
Interactive: phase registry entry

Names (7): corpus: corpus:phase:al-w:al12w
mp: mp:mp-aaaaaqpv
oqmd: oqmd:oqmd-10607
paper: paper:10.1016/j.calphad.2017.09.007:Al12W, paper:sha256-85fd53a1a176b694:Al12W
tdb: tdb:AlW-17Wan.tdb:AL12W, tdb:AlW-98Sau-LB.tdb:AL12W

TDB models of AL12W (2): PHASE and CONSTITUENT statements as written

AlW-17Wan.tdb: AL12W, type code %, sha256 9d538d0d3abf4347…

41: PHASE AL12W % 2 12 1 !
42: CONST AL12W : AL : W : !

AlW-98Sau-LB.tdb: AL12W, type code %, sha256 f53367dbb2e51e09…

44: PHASE AL12W % 2 12 1 !
45: CONST AL12W : AL : W : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2017.09.007 Peisheng Wang, Wei Xiong, Ursula R. Kattner, Carelyn E. Campbell, Eric A. Lass, Oleg Y. Kontsevoi et al., Thermodynamic re-assessment of the Al-Co-W system, Calphad 59, 112-130 (2017).
assessment that models this phase; reports values for this phase

AL2W_C40 (Al–W)

Id: phase:al-w:al2w-c40; status assigned
Structure: CrSi2 · C40 · hP9 · P6_222 (180); type st:c40-crsi2-hp9; tier A: standard phase name; confidence high
Stoichiometry: Al 0.6667, W 0.3333
Stability: stable in 2 of 2 calculated diagram(s): 1199.74–1939.31 K, x(W) 0.33333–0.33333
Literature: 10 values (10 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:al-w:al2w-c40
paper: paper:10.1016/j.calphad.2017.09.007:Al2W, paper:sha256-85fd53a1a176b694:Al2W
tdb: tdb:AlW-17Wan.tdb:AL2W_C40, tdb:AlW-98Sau-LB.tdb:AL2W_C40

TDB models of AL2W_C40 (2): PHASE and CONSTITUENT statements as written

AlW-17Wan.tdb: AL2W_C40, type code %, sha256 9d538d0d3abf4347…

56: PHASE AL2W_C40 % 2 2 1 !
57: CONST AL2W_C40 : AL : W : !

AlW-98Sau-LB.tdb: AL2W_C40, type code %, sha256 f53367dbb2e51e09…

69: PHASE AL2W_C40 % 2 2 1 !
70: CONST AL2W_C40 : AL : W : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2017.09.007 Peisheng Wang, Wei Xiong, Ursula R. Kattner, Carelyn E. Campbell, Eric A. Lass, Oleg Y. Kontsevoi et al., Thermodynamic re-assessment of the Al-Co-W system, Calphad 59, 112-130 (2017).
assessment that models this phase; reports values for this phase

AL4W (Al–W)

Id: phase:al-w:al4w; status assigned
Structure: Al4W · mC30 · Cm (8); type st:al4w-mc30; 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 0.8000, W 0.2000
Stability: stable in 2 of 2 calculated diagram(s): 300–1620.87 K, x(W) 0.2–0.2
Literature: 10 values (10 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:al-w:al4w
paper: paper:10.1016/j.calphad.2017.09.007:Al4W, paper:sha256-85fd53a1a176b694:Al4W
tdb: tdb:AlW-17Wan.tdb:AL4W, tdb:AlW-98Sau-LB.tdb:AL4W

TDB models of AL4W (2): PHASE and CONSTITUENT statements as written

AlW-17Wan.tdb: AL4W, type code %, sha256 9d538d0d3abf4347…

51: PHASE AL4W % 2 4 1 !
52: CONST AL4W : AL : W : !

AlW-98Sau-LB.tdb: AL4W, type code %, sha256 f53367dbb2e51e09…

54: PHASE AL4W % 2 4 1 !
55: CONST AL4W : AL : W : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2017.09.007 Peisheng Wang, Wei Xiong, Ursula R. Kattner, Carelyn E. Campbell, Eric A. Lass, Oleg Y. Kontsevoi et al., Thermodynamic re-assessment of the Al-Co-W system, Calphad 59, 112-130 (2017).
assessment that models this phase; reports values for this phase

AL5W (Al–W)

Id: phase:al-w:al5w; status assigned
Structure: Al5W · hP12 · P6_322 (182); type st:al5w-hp12; tier B: DFT-supported (unique MP + OQMD match); confidence high
Stoichiometry: Al 0.8333, W 0.1667
Stability: stable in 2 of 2 calculated diagram(s): 300–1149.59 K, x(W) 0.16667–0.16667
Literature: 10 values (10 accepted) from 2 papers
Interactive: phase registry entry

Names (7): corpus: corpus:phase:al-w:al5w
mp: mp:mp-aaaabswv
oqmd: oqmd:oqmd-10606
paper: paper:10.1016/j.calphad.2017.09.007:Al5W, paper:sha256-85fd53a1a176b694:Al5W
tdb: tdb:AlW-17Wan.tdb:AL5W, tdb:AlW-98Sau-LB.tdb:AL5W

TDB models of AL5W (2): PHASE and CONSTITUENT statements as written

AlW-17Wan.tdb: AL5W, type code %, sha256 9d538d0d3abf4347…

46: PHASE AL5W % 2 5 1 !
47: CONST AL5W : AL : W : !

AlW-98Sau-LB.tdb: AL5W, type code %, sha256 f53367dbb2e51e09…

49: PHASE AL5W % 2 5 1 !
50: CONST AL5W : AL : W : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2017.09.007 Peisheng Wang, Wei Xiong, Ursula R. Kattner, Carelyn E. Campbell, Eric A. Lass, Oleg Y. Kontsevoi et al., Thermodynamic re-assessment of the Al-Co-W system, Calphad 59, 112-130 (2017).
assessment that models this phase; reports values for this phase

AL77W23 (Al–W)

Id: phase:al-w:al77w23; status needs_review
No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
Candidate (sgte_mmc2): (Al77W23) — Hallstedt 2025 mmc2 row for AL77W23: Al77W23
Stoichiometry: Al 0.7700, W 0.2300
Stability: stable in 1 of 1 calculated diagram(s): 1571.03–1648.23 K, x(W) 0.23–0.23
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:al-w:al77w23
paper: paper:sha256-85fd53a1a176b694:Al77W23
tdb: tdb:AlW-98Sau-LB.tdb:AL77W23

TDB models of AL77W23 (1): PHASE and CONSTITUENT statements as written

AlW-98Sau-LB.tdb: AL77W23, type code %, sha256 f53367dbb2e51e09…

59: PHASE AL77W23 % 2 77 23 !
60: CONST AL77W23 : AL : W : !

AL7W3 (Al–W)

Id: phase:al-w:al7w3; status needs_review
No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
Candidate (sgte_mmc2): (Al7W3) — Hallstedt 2025 mmc2 row for AL7W3: Al7W3
Stoichiometry: Al 0.7000, W 0.3000
Stability: stable in 1 of 1 calculated diagram(s): 1580.05–1706.83 K, x(W) 0.3–0.3
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:al-w:al7w3
paper: paper:sha256-85fd53a1a176b694:Al7W3
tdb: tdb:AlW-98Sau-LB.tdb:AL7W3

TDB models of AL7W3 (1): PHASE and CONSTITUENT statements as written

AlW-98Sau-LB.tdb: AL7W3, type code %, sha256 f53367dbb2e51e09…

64: PHASE AL7W3 % 2 7 3 !
65: CONST AL7W3 : AL : W : !

BCC_A2 (Al–W)

Id: phase:al-w: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 2 of 2 calculated diagram(s): 300–3999.9 K, x(W) 0.83995–1
Literature: 8 values (8 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:al-w:bcc-a2
paper: paper:10.1016/j.calphad.2017.09.007:(W), paper:sha256-85fd53a1a176b694:bcc-A2
tdb: tdb:AlW-17Wan.tdb:BCC_A2, tdb:AlW-98Sau-LB.tdb:BCC_A2

TDB models of BCC_A2 (2): PHASE and CONSTITUENT statements as written

AlW-17Wan.tdb: BCC_A2, type code %B, sha256 9d538d0d3abf4347…

31: PHASE BCC_A2 %B 2 1 3 !
32: CONST BCC_A2 : AL W : VA : !

AlW-98Sau-LB.tdb: BCC_A2, type code %B, sha256 f53367dbb2e51e09…

34: PHASE BCC_A2 %B 2 1 3 !
35: CONST BCC_A2 : AL W : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2017.09.007 Peisheng Wang, Wei Xiong, Ursula R. Kattner, Carelyn E. Campbell, Eric A. Lass, Oleg Y. Kontsevoi et al., Thermodynamic re-assessment of the Al-Co-W system, Calphad 59, 112-130 (2017).
assessment that models this phase; reports values for this phase

FCC_A1 (Al–W)

Id: phase:al-w: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 2 of 2 calculated diagram(s): 300–933.6 K, x(W) 0–0.0003
Literature: 4 values (4 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:al-w:fcc-a1
paper: paper:10.1016/j.calphad.2017.09.007:(Al), paper:sha256-85fd53a1a176b694:fcc-A
tdb: tdb:AlW-17Wan.tdb:FCC_A1, tdb:AlW-98Sau-LB.tdb:FCC_A1

TDB models of FCC_A1 (2): PHASE and CONSTITUENT statements as written

AlW-17Wan.tdb: FCC_A1, type code %A, sha256 9d538d0d3abf4347…

26: PHASE FCC_A1 %A 2 1 1 !
27: CONST FCC_A1 : AL W : VA : !

AlW-98Sau-LB.tdb: FCC_A1, type code %A, sha256 f53367dbb2e51e09…

29: PHASE FCC_A1 %A 2 1 1 !
30: CONST FCC_A1 : AL W : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2017.09.007 Peisheng Wang, Wei Xiong, Ursula R. Kattner, Carelyn E. Campbell, Eric A. Lass, Oleg Y. Kontsevoi et al., Thermodynamic re-assessment of the Al-Co-W system, Calphad 59, 112-130 (2017).
assessment that models this phase; reports values for this phase

HCP_A3 (Al–W)

Id: phase:al-w: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: 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-w:hcp-a3
tdb: tdb:AlW-17Wan.tdb:HCP_A3, tdb:AlW-98Sau-LB.tdb:HCP_A3

TDB models of HCP_A3 (2): PHASE and CONSTITUENT statements as written

AlW-17Wan.tdb: HCP_A3, type code %A, sha256 9d538d0d3abf4347…

36: PHASE HCP_A3 %A 2 1 0.5 !
37: CONST HCP_A3 : AL W : VA : !

AlW-98Sau-LB.tdb: HCP_A3, type code %A, sha256 f53367dbb2e51e09…

39: PHASE HCP_A3 %A 2 1 0.5 !
40: CONST HCP_A3 : AL W : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2017.09.007 Peisheng Wang, Wei Xiong, Ursula R. Kattner, Carelyn E. Campbell, Eric A. Lass, Oleg Y. Kontsevoi et al., Thermodynamic re-assessment of the Al-Co-W system, Calphad 59, 112-130 (2017).
assessment that models this phase

LIQUID (Al–W)

Id: phase:al-w:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 918.48–4000 K, x(W) 0–1
Literature: 22 values (22 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:al-w:liquid
paper: paper:10.1016/j.calphad.2017.09.007:L, paper:sha256-85fd53a1a176b694:Liquid
tdb: tdb:AlW-17Wan.tdb:LIQUID, tdb:AlW-98Sau-LB.tdb:LIQUID

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

AlW-17Wan.tdb: LIQUID, type code %, sha256 9d538d0d3abf4347…

21: PHASE LIQUID:L % 1 1 !
22: CONST LIQUID:L : AL W : !

AlW-98Sau-LB.tdb: LIQUID, type code %, sha256 f53367dbb2e51e09…

24: PHASE LIQUID:L % 1 1 !
25: CONST LIQUID:L : AL W : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2017.09.007 Peisheng Wang, Wei Xiong, Ursula R. Kattner, Carelyn E. Campbell, Eric A. Lass, Oleg Y. Kontsevoi et al., Thermodynamic re-assessment of the Al-Co-W system, Calphad 59, 112-130 (2017).
assessment that models this phase; reports 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}
}