Cr–Cu phases

4 phases (tier A 3, liquid 1); 4 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 · Cr–Cu system page · Markdown · field reference

Phases of the Cr–Cu system (4)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:cr-cu:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 6 of 6 calculated diagram(s): 300–2215.9 K, x(Cu) 0–0.89	15	6
FCC_A1 phase:cr-cu:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 6 of 6 calculated diagram(s): 300–3999.02 K, x(Cu) 0.19–1	15	6
HCP_A3 phase:cr-cu:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 2 of 6 calculated diagram(s): 1350–1350 K, x(Cu) 0.18–0.84	0	6
LIQUID phase:cr-cu:liquid	liquid	liquid	stable in 6 of 6 calculated diagram(s): 1347.8–4000 K, x(Cu) 0–1	15	6

BCC_A2 (Cr–Cu)

Id: phase:cr-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 6 of 6 calculated diagram(s): 300–2215.9 K, x(Cu) 0–0.89
Literature: 15 values (15 accepted) from 2 papers
Interactive: phase registry entry

Names (9): corpus: corpus:phase:cr-cu:bcc-a2
paper: paper:10.1007/s11106-006-0106-x:(Cr), paper:sha256-85fd53a1a176b694:bcc-A2
tdb: tdb:CrCu-00Jac.tdb:BCC_A2, tdb:CrCu-06Tur.tdb:BCC_A2, tdb:CrCu-17Liu.tdb:BCC_A2, tdb:CrCu-87Sau.tdb:BCC_A2, tdb:CrCu-90Ham.tdb:BCC_A2, tdb:CrCu-95Zen-LB.tdb:BCC_A2

TDB models of BCC_A2 (6): PHASE and CONSTITUENT statements as written

CrCu-00Jac.tdb: BCC_A2, type code %B, sha256 aba29d210640bde6…

29: PHASE BCC_A2 %B 2 1 3 !
30: CONST BCC_A2 : CR% CU : VA : !

CrCu-06Tur.tdb: BCC_A2, type code %B, sha256 43b7d9002998d575…

29: PHASE BCC_A2 %B 2 1 3 !
30: CONST BCC_A2 : CR% CU : VA : !

CrCu-17Liu.tdb: BCC_A2, type code %B, sha256 795ca2b88d6ba391…

29: PHASE BCC_A2 %B 2 1 3 !
30: CONST BCC_A2 : CR% CU : VA : !

CrCu-87Sau.tdb: BCC_A2, type code %B, sha256 af63c1df4db3f5b9…

34: PHASE BCC_A2 %B 2 1 3 !
35: CONST BCC_A2 : CR% CU : VA : !

CrCu-90Ham.tdb: BCC_A2, type code %B, sha256 7070dbd542901790…

34: PHASE BCC_A2 %B 2 1 3 !
35: CONST BCC_A2 : CR% CU : VA : !

CrCu-95Zen-LB.tdb: BCC_A2, type code %B, sha256 bc9cd744f47d1be2…

37: PHASE BCC_A2 %B 2 1 3 !
38: CONST BCC_A2 : CR% CU : VA : !

Example references (10 of 11; assessments first):

doi:10.1007/s11106-006-0106-x M. A. Turchanin, Phase equilibria and thermodynamics of binary copper systems with 3d-metals. III. Copper-chromium system, Powder Metall Met Ceram 45, 457-467 (2006).
assessment that models this phase; reports values for this phase
doi:10.1016/0364-5916(90)90014-Q M. Hamalainen, K. Jaaskelainen, R. Luoma, M. Nuotio, P. Taskinen, O. Teppo, Calphad, 14, 125-37(1990).
assessment that models this phase; cited as the source of values for this phase
doi:10.1016/0364-5916(95)00010-C K. Zeng, M. Hamalainen, Calphad, 19, 93-104(1995).
assessment that models this phase; cited as the source of values for this phase
doi:10.1016/j.calphad.2017.07.002 Y. Liu, P. Zhou, S. Liu, Y. Du, Calphad, 59, 1-11(2017).
assessment that models this phase
doi:10.1179/mst.1987.3.8.671 N. Saunders, Thermodynamic characterization of Cu–Cr system, Materials Science and Technology 3, 671-673 (1987).
assessment that models this phase
doi:10.1515/ijmr-2000-910710 K.T. Jacob, S. Priya, Y. Waseda, Z. Metallkd., 91, 594-600(2000).
assessment that models this phase
doi:10.1002/zaac.19080590136 G. Hindrichs, Metallographische Mitteilungen aus dem Institut für physikalische Chemie der Universität Göttingen. LXVII. Über einige Chrom‐ und Manganlegierungen, Z. Anorg. Chem. 59, 414-449 (1908).
cited as the source of values for this phase
doi:10.1002/zaac.19231310113 Erich Siedschlag, Über Chrom‐Kupfer‐Nickel‐Legierungen, Z. Anorg. Allg. Chem. 131, 173-190 (1923).
cited as the source of values for this phase
doi:10.1007/bf01389605 V. G. Ivanchenko, O. N. Filatova, Calculation of phase equilibria and thermodynamic properties of alloys of the Cr-Cu system, Powder Metall Met Ceram 35, 167-172 (1996).
cited as the source of values for this phase
doi:10.1179/026708387790329469 N. Saunders, “Thermodynamic characterization of copper − chromium system,” Mater. Sci. Technol., 3, No. 8, 671-673 (1987).
cited as the source of values for this phase

FCC_A1 (Cr–Cu)

Id: phase:cr-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 6 of 6 calculated diagram(s): 300–3999.02 K, x(Cu) 0.19–1
Literature: 15 values (15 accepted) from 2 papers
Interactive: phase registry entry

Names (9): corpus: corpus:phase:cr-cu:fcc-a1
paper: paper:10.1007/s11106-006-0106-x:(Cu), paper:sha256-85fd53a1a176b694:fcc-A1
tdb: tdb:CrCu-00Jac.tdb:FCC_A1, tdb:CrCu-06Tur.tdb:FCC_A1, tdb:CrCu-17Liu.tdb:FCC_A1, tdb:CrCu-87Sau.tdb:FCC_A1, tdb:CrCu-90Ham.tdb:FCC_A1, tdb:CrCu-95Zen-LB.tdb:FCC_A1

TDB models of FCC_A1 (6): PHASE and CONSTITUENT statements as written

CrCu-00Jac.tdb: FCC_A1, type code %A, sha256 aba29d210640bde6…

24: PHASE FCC_A1 %A 2 1 1 !
25: CONST FCC_A1 : CR CU% : VA : !

CrCu-06Tur.tdb: FCC_A1, type code %A, sha256 43b7d9002998d575…

24: PHASE FCC_A1 %A 2 1 1 !
25: CONST FCC_A1 : CR CU% : VA : !

CrCu-17Liu.tdb: FCC_A1, type code %A, sha256 795ca2b88d6ba391…

24: PHASE FCC_A1 %A 2 1 1 !
25: CONST FCC_A1 : CR CU% : VA : !

CrCu-87Sau.tdb: FCC_A1, type code %A, sha256 af63c1df4db3f5b9…

29: PHASE FCC_A1 %A 2 1 1 !
30: CONST FCC_A1 : CR CU% : VA : !

CrCu-90Ham.tdb: FCC_A1, type code %A, sha256 7070dbd542901790…

29: PHASE FCC_A1 %A 2 1 1 !
30: CONST FCC_A1 : CR CU% : VA : !

CrCu-95Zen-LB.tdb: FCC_A1, type code %A, sha256 bc9cd744f47d1be2…

32: PHASE FCC_A1 %A 2 1 1 !
33: CONST FCC_A1 : CR CU% : VA : !

Example references (10 of 11; assessments first):

doi:10.1007/s11106-006-0106-x M. A. Turchanin, Phase equilibria and thermodynamics of binary copper systems with 3d-metals. III. Copper-chromium system, Powder Metall Met Ceram 45, 457-467 (2006).
assessment that models this phase; reports values for this phase
doi:10.1016/0364-5916(90)90014-Q M. Hamalainen, K. Jaaskelainen, R. Luoma, M. Nuotio, P. Taskinen, O. Teppo, Calphad, 14, 125-37(1990).
assessment that models this phase; cited as the source of values for this phase
doi:10.1016/0364-5916(95)00010-C K. Zeng, M. Hamalainen, Calphad, 19, 93-104(1995).
assessment that models this phase; cited as the source of values for this phase
doi:10.1016/j.calphad.2017.07.002 Y. Liu, P. Zhou, S. Liu, Y. Du, Calphad, 59, 1-11(2017).
assessment that models this phase
doi:10.1179/mst.1987.3.8.671 N. Saunders, Thermodynamic characterization of Cu–Cr system, Materials Science and Technology 3, 671-673 (1987).
assessment that models this phase
doi:10.1515/ijmr-2000-910710 K.T. Jacob, S. Priya, Y. Waseda, Z. Metallkd., 91, 594-600(2000).
assessment that models this phase
doi:10.1002/zaac.19080590136 G. Hindrichs, Metallographische Mitteilungen aus dem Institut für physikalische Chemie der Universität Göttingen. LXVII. Über einige Chrom‐ und Manganlegierungen, Z. Anorg. Chem. 59, 414-449 (1908).
cited as the source of values for this phase
doi:10.1002/zaac.19231310113 Erich Siedschlag, Über Chrom‐Kupfer‐Nickel‐Legierungen, Z. Anorg. Allg. Chem. 131, 173-190 (1923).
cited as the source of values for this phase
doi:10.1007/bf01389605 V. G. Ivanchenko, O. N. Filatova, Calculation of phase equilibria and thermodynamic properties of alloys of the Cr-Cu system, Powder Metall Met Ceram 35, 167-172 (1996).
cited as the source of values for this phase
doi:10.1179/026708387790329469 N. Saunders, “Thermodynamic characterization of copper − chromium system,” Mater. Sci. Technol., 3, No. 8, 671-673 (1987).
cited as the source of values for this phase

HCP_A3 (Cr–Cu)

Id: phase:cr-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 2 of 6 calculated diagram(s): 1350–1350 K, x(Cu) 0.18–0.84
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (7): corpus: corpus:phase:cr-cu:hcp-a3
tdb: tdb:CrCu-00Jac.tdb:HCP_A3, tdb:CrCu-06Tur.tdb:HCP_A3, tdb:CrCu-17Liu.tdb:HCP_A3, tdb:CrCu-87Sau.tdb:HCP_A3, tdb:CrCu-90Ham.tdb:HCP_A3, tdb:CrCu-95Zen-LB.tdb:HCP_A3

TDB models of HCP_A3 (6): PHASE and CONSTITUENT statements as written

CrCu-00Jac.tdb: HCP_A3, type code %A, sha256 aba29d210640bde6…

34: PHASE HCP_A3 %A 2 1 0.5 !
35: CONST HCP_A3 : CR CU : VA : !

CrCu-06Tur.tdb: HCP_A3, type code %A, sha256 43b7d9002998d575…

34: PHASE HCP_A3 %A 2 1 0.5 !
35: CONST HCP_A3 : CR CU : VA : !

CrCu-17Liu.tdb: HCP_A3, type code %A, sha256 795ca2b88d6ba391…

34: PHASE HCP_A3 %A 2 1 0.5 !
35: CONST HCP_A3 : CR CU : VA : !

CrCu-87Sau.tdb: HCP_A3, type code %A, sha256 af63c1df4db3f5b9…

39: PHASE HCP_A3 %A 2 1 0.5 !
40: CONST HCP_A3 : CR CU : VA : !

CrCu-90Ham.tdb: HCP_A3, type code %A, sha256 7070dbd542901790…

39: PHASE HCP_A3 %A 2 1 0.5 !
40: CONST HCP_A3 : CR CU : VA : !

CrCu-95Zen-LB.tdb: HCP_A3, type code %A, sha256 bc9cd744f47d1be2…

42: PHASE HCP_A3 %A 2 1 0.5 !
43: CONST HCP_A3 : CR CU : VA : !

Example references (6 of 6; assessments first):

doi:10.1007/s11106-006-0106-x M. A. Turchanin, Phase equilibria and thermodynamics of binary copper systems with 3d-metals. III. Copper-chromium system, Powder Metall Met Ceram 45, 457-467 (2006).
assessment that models this phase
doi:10.1016/0364-5916(90)90014-Q M. Hamalainen, K. Jaaskelainen, R. Luoma, M. Nuotio, P. Taskinen, O. Teppo, Calphad, 14, 125-37(1990).
assessment that models this phase
doi:10.1016/0364-5916(95)00010-C K. Zeng, M. Hamalainen, Calphad, 19, 93-104(1995).
assessment that models this phase
doi:10.1016/j.calphad.2017.07.002 Y. Liu, P. Zhou, S. Liu, Y. Du, Calphad, 59, 1-11(2017).
assessment that models this phase
doi:10.1179/mst.1987.3.8.671 N. Saunders, Thermodynamic characterization of Cu–Cr system, Materials Science and Technology 3, 671-673 (1987).
assessment that models this phase
doi:10.1515/ijmr-2000-910710 K.T. Jacob, S. Priya, Y. Waseda, Z. Metallkd., 91, 594-600(2000).
assessment that models this phase

LIQUID (Cr–Cu)

Id: phase:cr-cu:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 6 of 6 calculated diagram(s): 1347.8–4000 K, x(Cu) 0–1
Literature: 15 values (15 accepted) from 2 papers
Interactive: phase registry entry

Names (9): corpus: corpus:phase:cr-cu:liquid
paper: paper:10.1007/s11106-006-0106-x:L, paper:sha256-85fd53a1a176b694:Liquid
tdb: tdb:CrCu-00Jac.tdb:LIQUID, tdb:CrCu-06Tur.tdb:LIQUID, tdb:CrCu-17Liu.tdb:LIQUID, tdb:CrCu-87Sau.tdb:LIQUID, tdb:CrCu-90Ham.tdb:LIQUID, tdb:CrCu-95Zen-LB.tdb:LIQUID

TDB models of LIQUID (6): PHASE and CONSTITUENT statements as written

CrCu-00Jac.tdb: LIQUID, type code %, sha256 aba29d210640bde6…

19: PHASE LIQUID:L % 1 1 !
20: CONST LIQUID:L : CR CU : !

CrCu-06Tur.tdb: LIQUID, type code %, sha256 43b7d9002998d575…

19: PHASE LIQUID:L % 1 1 !
20: CONST LIQUID:L : CR CU : !

CrCu-17Liu.tdb: LIQUID, type code %, sha256 795ca2b88d6ba391…

19: PHASE LIQUID:L % 1 1 !
20: CONST LIQUID:L : CR CU : !

CrCu-87Sau.tdb: LIQUID, type code %, sha256 af63c1df4db3f5b9…

24: PHASE LIQUID:L % 1 1 !
25: CONST LIQUID:L : CR CU : !

CrCu-90Ham.tdb: LIQUID, type code %, sha256 7070dbd542901790…

24: PHASE LIQUID:L % 1 1 !
25: CONST LIQUID:L : CR CU : !

CrCu-95Zen-LB.tdb: LIQUID, type code %, sha256 bc9cd744f47d1be2…

27: PHASE LIQUID:L % 1 1 !
28: CONST LIQUID:L : CR CU : !

Example references (10 of 11; assessments first):

doi:10.1007/s11106-006-0106-x M. A. Turchanin, Phase equilibria and thermodynamics of binary copper systems with 3d-metals. III. Copper-chromium system, Powder Metall Met Ceram 45, 457-467 (2006).
assessment that models this phase; reports values for this phase
doi:10.1016/0364-5916(90)90014-Q M. Hamalainen, K. Jaaskelainen, R. Luoma, M. Nuotio, P. Taskinen, O. Teppo, Calphad, 14, 125-37(1990).
assessment that models this phase; cited as the source of values for this phase
doi:10.1016/0364-5916(95)00010-C K. Zeng, M. Hamalainen, Calphad, 19, 93-104(1995).
assessment that models this phase; cited as the source of values for this phase
doi:10.1016/j.calphad.2017.07.002 Y. Liu, P. Zhou, S. Liu, Y. Du, Calphad, 59, 1-11(2017).
assessment that models this phase
doi:10.1179/mst.1987.3.8.671 N. Saunders, Thermodynamic characterization of Cu–Cr system, Materials Science and Technology 3, 671-673 (1987).
assessment that models this phase
doi:10.1515/ijmr-2000-910710 K.T. Jacob, S. Priya, Y. Waseda, Z. Metallkd., 91, 594-600(2000).
assessment that models this phase
doi:10.1002/zaac.19080590136 G. Hindrichs, Metallographische Mitteilungen aus dem Institut für physikalische Chemie der Universität Göttingen. LXVII. Über einige Chrom‐ und Manganlegierungen, Z. Anorg. Chem. 59, 414-449 (1908).
cited as the source of values for this phase
doi:10.1002/zaac.19231310113 Erich Siedschlag, Über Chrom‐Kupfer‐Nickel‐Legierungen, Z. Anorg. Allg. Chem. 131, 173-190 (1923).
cited as the source of values for this phase
doi:10.1007/bf01389605 V. G. Ivanchenko, O. N. Filatova, Calculation of phase equilibria and thermodynamic properties of alloys of the Cr-Cu system, Powder Metall Met Ceram 35, 167-172 (1996).
cited as the source of values for this phase
doi:10.1179/026708387790329469 N. Saunders, “Thermodynamic characterization of copper − chromium system,” Mater. Sci. Technol., 3, No. 8, 671-673 (1987).
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}
}