Cu–Y system

71 accepted literature values from 2 paper(s) (experimental 51, model 20); 1 calculated phase diagram(s). 2 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: JSON · CSV · interactive explorer · interactive phase diagram · phases (10) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	51
model	20

Accepted values by property group
Property group	Values
invariant reaction	36
phase transition	17
crystal structure	18

Calculated phase diagrams

Binary phase diagrams calculated with pycalphad 0.11.2 from the SGTE binary collection (Hallstedt 2025, CC BY 4.0). Evidence class: model.

Assessments with a calculated phase diagram
TDB file	Assessment	SHA-256	Links
CuY-94Fri-LB.tdb	S.G. Fries, H.L. Lukas, R. Konetzki, R. Schmid-Fetzer, J. Phase Equilib., 15, 606-14(1994). doi:10.1007/BF02647621	`a8f5ab09a715225a83a08eafa2554e1f0fd2c9cc35395a5f734448a7a5013007`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
CuY-94Fri-LB.tdb	1751.15	LIQUID (x(Y) 0.97955) + HCP_A3 (x(Y) 1) + BCC_A2 (x(Y) 1)
CuY-94Fri-LB.tdb	1199.13	CU4Y (x(Y) 0.2) + CU7Y2 (x(Y) 0.22222) + LIQUID (x(Y) 0.26189)
CuY-94Fri-LB.tdb	1199.13	CU4Y (x(Y) 0.2) + CU7Y2 (x(Y) 0.22222) + LIQUID (x(Y) 0.26191)
CuY-94Fri-LB.tdb	1199.13	CU4Y (x(Y) 0.2) + CU7Y2 (x(Y) 0.22222) + LIQUID (x(Y) 0.26161)
CuY-94Fri-LB.tdb	1184.64	LIQUID (x(Y) 0.13318) + CU6Y (x(Y) 0.14744) + CU4Y (x(Y) 0.2)
CuY-94Fri-LB.tdb	1184.64	LIQUID (x(Y) 0.13356) + CU6Y (x(Y) 0.14759) + CU4Y (x(Y) 0.2)
CuY-94Fri-LB.tdb	1153.41	FCC_A1 (x(Y) 0) + LIQUID (x(Y) 0.09395) + CU6Y (x(Y) 0.12885)
CuY-94Fri-LB.tdb	1153.41	FCC_A1 (x(Y) 0) + LIQUID (x(Y) 0.09383) + CU6Y (x(Y) 0.12878)
CuY-94Fri-LB.tdb	1151.18	CU7Y2 (x(Y) 0.22222) + LIQUID (x(Y) 0.29845) + CU2Y_H (x(Y) 0.33333)
CuY-94Fri-LB.tdb	1151.18	CU7Y2 (x(Y) 0.22222) + LIQUID (x(Y) 0.29822) + CU2Y_H (x(Y) 0.33333)
CuY-94Fri-LB.tdb	1151.17	CU7Y2 (x(Y) 0.22222) + LIQUID (x(Y) 0.29832) + CU2Y_H (x(Y) 0.33333)
CuY-94Fri-LB.tdb	1128	CU7Y2 (x(Y) 0.22222) + CU2Y_R (x(Y) 0.33333) + CU2Y_H (x(Y) 0.33333)
CuY-94Fri-LB.tdb	1128	CU2Y_R (x(Y) 0.33333) + CU2Y_H (x(Y) 0.33333) + LIQUID (x(Y) 0.38545)
CuY-94Fri-LB.tdb	1116.09	CU2Y_R (x(Y) 0.33333) + LIQUID (x(Y) 0.39579) + CUY_B2 (x(Y) 0.5)
CuY-94Fri-LB.tdb	1116.09	CU2Y_R (x(Y) 0.33333) + LIQUID (x(Y) 0.39575) + CUY_B2 (x(Y) 0.5)
CuY-94Fri-LB.tdb	1077.1	CUY_B2 (x(Y) 0.5) + LIQUID (x(Y) 0.64484) + HCP_A3 (x(Y) 1)

Convex hulls: Materials Project DFT hull · OQMD DFT hull

Invariant reactions (literature)

Invariant reactions reported in the literature for the Cu–Y system (36)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location
1224	congruent melting: Liquid <=> Cu4Y	Liquid: Y 0.2; Cu4Y: Y 0.2	model	[1] (ed.) 1998	Table I, p. 200, row 9 report
1220	congruent melting: Liquid <=> CuY	Liquid: Y 0.5; CuY: Y 0.5	model	[1] (ed.) 1998	Table I, p. 200, row 11 report
1203	L + YCu4 -> YCu6	YCu4: Y 0.2; YCu6: Y 0.142857	experimental	[2] Fries 1994 cites ref. 61Dom	Table 2, p. 4, row 34 report
1198	peritectic: Liquid <=> Cu4Y + Cu7Y2	Liquid: Y 0.262; Cu4Y: Y 0.2; Cu7Y2: Y 0.222	model	[1] (ed.) 1998	Table I, p. 200, row 4 report
1198	L + YCu4 -> Y2Cu7	YCu4: Y 0.2; Y2Cu7: Y 0.222222	experimental	[2] Fries 1994	Table 2, p. 4, row 26 report
1198	L + YCu4 -> Y2Cu7	YCu4: Y 0.2; Y2Cu7: Y 0.222222	model	[2] Fries 1994	Table 2, p. 4, row 27 report
1193	L + YCu4 -> Y2Cu7	YCu4: Y 0.2; Y2Cu7: Y 0.222222	experimental	[2] Fries 1994 cites ref. 66Bea	Table 2, p. 4, row 25 report
1184	L + YCu4 -> YCu6	YCu4: Y 0.2; YCu6: Y 0.142857	model	[2] Fries 1994	Table 2, p. 4, row 36 report
1184	L + YCu4 -> YCu6	YCu4: Y 0.2; YCu6: Y 0.142857	experimental	[2] Fries 1994	Table 2, p. 4, row 35 report
1184	peritectic: Liquid + Cu4Y <=> Cu6Y	Liquid: Y 0.133; Cu4Y: Y 0.2; Cu6Y: Y 0.147	model	[1] (ed.) 1998	Table I, p. 200, row 5 report
1183	L + YCu4 -> YCu6	YCu4: Y 0.2; YCu6: Y 0.142857	experimental	[2] Fries 1994 cites ref. 66Bea	Table 2, p. 4, row 33 report
1163	eutectic: L -> (Cu) + YCu6	YCu6: Y 0.142857	experimental	[2] Fries 1994 cites ref. 61Dom	Table 2, p. 4, row 39 report
1155	eutectic: L -> (Cu) + YCu6	YCu6: Y 0.142857	experimental	[2] Fries 1994 cites ref. 89Qi	Table 2, p. 4, row 41 report
1153	eutectic: Liquid <=> fcc-A1 + Cu6Y	Liquid: Y 0.094; fcc-A1: Y 0; Cu6Y: Y 0.129	model	[1] (ed.) 1998	Table I, p. 200, row 6 report
1153	eutectic: L -> (Cu) + YCu6	YCu6: Y 0.142857	model	[2] Fries 1994	Table 2, p. 4, row 43 report
1153	eutectic: L -> (Cu) + YCu6	YCu6: Y 0.142857	experimental	[2] Fries 1994	Table 2, p. 4, row 42 report
1149	congruent melting: Liquid <=> Cu2Y-H	Liquid: Y 0.333; Cu2Y-H: Y 0.333	model	[1] (ed.) 1998	Table I, p. 200, row 10 report
1149	eutectic: L -> Y2Cu7 + YCu2	Y2Cu7: Y 0.222222; YCu2: Y 0.333333	model	[2] Fries 1994	Table 2, p. 4, row 24 report
1148.6	eutectic: Liquid <=> Cu2Y-H + Cu7Y2	Liquid: Y 0.299; Cu2Y-H: Y 0.333; Cu7Y2: Y 0.222	model	[1] (ed.) 1998	Table I, p. 200, row 3 report
1139	eutectic: L -> (Cu) + YCu6	YCu6: Y 0.142857	experimental	[2] Fries 1994 cites ref. 61Hae	Table 2, p. 4, row 38 report
1135	eutectic: L -> Y2Cu7 + YCu2	Y2Cu7: Y 0.222222; YCu2: Y 0.333333	experimental	[2] Fries 1994 cites ref. 61Hae	Table 2, p. 4, row 21 report
1133	eutectic: L -> (Cu) + YCu6	YCu6: Y 0.142857	experimental	[2] Fries 1994 cites ref. 75Fed	Table 2, p. 4, row 40 report
1128	polymorphic: Cu2Y-R <=> Cu2Y-H	Cu2Y-R: Y 0.333; Cu2Y-H: Y 0.333	model	[1] (ed.) 1998	Table I, p. 200, row 8 report
1127	eutectic: L -> Y2Cu7 + YCu2	Y2Cu7: Y 0.222222; YCu2: Y 0.333333	experimental	[2] Fries 1994 cites ref. 89Qi	Table 2, p. 4, row 23 report
1123	eutectic: L -> (Cu) + YCu6	YCu6: Y 0.142857	experimental	[2] Fries 1994 cites ref. 57Daa	Table 2, p. 4, row 37 report
1116	eutectic: L -> YCu2(r) + YCu	YCu2(r): Y 0.333333; YCu: Y 0.5	experimental	[2] Fries 1994	Table 2, p. 4, row 12 report
1113	eutectic: L -> YCu2(r) + YCu	YCu2(r): Y 0.333333; YCu: Y 0.5	model	[2] Fries 1994	Table 2, p. 4, row 13 report
1113	eutectic: Liquid <=> Cu2Y-R + CuY	Liquid: Y 0.396; Cu2Y-R: Y 0.333; CuY: Y 0.5	model	[1] (ed.) 1998	Table I, p. 200, row 2 report
1113	eutectic: L -> Y2Cu7 + YCu2	Y2Cu7: Y 0.222222; YCu2: Y 0.333333	experimental	[2] Fries 1994 cites ref. 61Dom	Table 2, p. 4, row 22 report
1110	eutectic: L -> YCu2(r) + YCu	YCu2(r): Y 0.333333; YCu: Y 0.5	experimental	[2] Fries 1994 cites ref. 89Qi	Table 2, p. 4, row 11 report
1109	eutectic: L -> YCu2(r) + YCu	YCu2(r): Y 0.333333; YCu: Y 0.5	experimental	[2] Fries 1994 cites ref. 61Hae	Table 2, p. 4, row 9 report
1070	eutectic: L -> Y + YCu	YCu: Y 0.5	model	[2] Fries 1994	Table 2, p. 4, row 4 report
1070	eutectic: L -> Y + YCu	YCu: Y 0.5	experimental	[2] Fries 1994 cites ref. 89Qi	Table 2, p. 4, row 3 report
1070	eutectic: Liquid <=> CuY + hcp-A3	Liquid: Y 0.646; CuY: Y 0.646; hcp-A3: Y 1	model	[1] (ed.) 1998	Table I, p. 200, row 1 report
1055	eutectic: L -> Y + YCu	YCu: Y 0.5	experimental	[2] Fries 1994 cites ref. 61Hae	Table 2, p. 4, row 1 report
1033	eutectic: L -> Y + YCu	YCu: Y 0.5	experimental	[2] Fries 1994 cites ref. 61Dom	Table 2, p. 4, row 2 report

Other properties

Phase transition (17)

Phase transition, Cu–Y system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Phase transition	1128 K	1128	YCu2(r) -> YCu2(h) YCu2(r): Y 0.333333; YCu2(h): Y 0.333333	experimental	[2] Fries 1994	Table 2, p. 4, row 14 report
Phase transition	1128 K	1128	YCu2(r) -> YCu2(h) YCu2(r): Y 0.333333; YCu2(h): Y 0.333333	model	[2] Fries 1994	Table 2, p. 4, row 15 report
Phase transition	1166 K	1166	other	experimental	[2] Fries 1994	p. 3 report	Note that the "liquidus" temperatures (second peak on heating) for all three samples are almost the same, 1166 K upon cooling, indicating a very flat liquidus at YCu2.
Phase transition	1168 K	1168	L -> YCu2(h) L: Y 0.333333; YCu2(h): Y 0.333333	experimental	[2] Fries 1994 cites ref. 61Hae	Table 2, p. 4, row 16 report
Phase transition	1170 K	1170	L -> YCu2(h) L: Y 0.333333; YCu2(h): Y 0.333333	experimental	[2] Fries 1994 cites ref. 89Qi	Table 2, p. 4, row 18 report
Phase transition	1170 K	1170	L -> YCu2(h) L: Y 0.333333; YCu2(h): Y 0.333333	experimental	[2] Fries 1994	Table 2, p. 4, row 19 report
Phase transition	1170 K	1170	L -> YCu2(h) L: Y 0.333333; YCu2(h): Y 0.333333	model	[2] Fries 1994	Table 2, p. 4, row 20 report
Phase transition	1208 K	1208	L -> YCu L: Y 0.5; YCu: Y 0.5	experimental	[2] Fries 1994 cites ref. 61Dom	Table 2, p. 4, row 6 report
Phase transition	1208 K	1208	L -> YCu2(h) L: Y 0.333333; YCu2(h): Y 0.333333	experimental	[2] Fries 1994 cites ref. 61Dom	Table 2, p. 4, row 17 report
Phase transition	1220 K	1220	L -> YCu L: Y 0.5; YCu: Y 0.5	experimental	[2] Fries 1994 cites ref. 89Qi	Table 2, p. 4, row 7 report
Phase transition	1220 K	1220	L -> YCu L: Y 0.5; YCu: Y 0.5	model	[2] Fries 1994	Table 2, p. 4, row 8 report
Phase transition	1225 K	1225	L -> YCu L: Y 0.5; YCu: Y 0.5	experimental	[2] Fries 1994 cites ref. 61Hae	Table 2, p. 4, row 5 report
Phase transition	1240 K	1240	L -> YCu4 L: Y 0.2; YCu4: Y 0.2	experimental	[2] Fries 1994 cites ref. 89Qi	Table 2, p. 4, row 30 report
Phase transition	1244 K	1244	L -> YCu4 L: Y 0.2; YCu4: Y 0.2	experimental	[2] Fries 1994	Table 2, p. 4, row 31 report
Phase transition	1244 K	1244	L -> YCu4 L: Y 0.2; YCu4: Y 0.2	model	[2] Fries 1994	Table 2, p. 4, row 32 report
Phase transition	1248 K	1248	L -> YCu4 L: Y 0.2; YCu4: Y 0.2	experimental	[2] Fries 1994 cites ref. 66Bea	Table 2, p. 4, row 29 report
Phase transition	1258 K	1258	L -> YCu4 L: Y 0.2; YCu4: Y 0.2	experimental	[2] Fries 1994 cites ref. 61Dom	Table 2, p. 4, row 28 report

Crystal structure (18)

Crystal structure, Cu–Y system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Lattice a	4.985 Å ± 0.003	973.15	YCu6 alloy: Cu 0.8427, Y 0.1573	experimental	[2] Fries 1994	Table I, p. 4, row 5 report
Lattice a	4.949 Å ± 0.004	973.15	YCu6 alloy: Cu 0.881, Y 0.119	experimental	[2] Fries 1994	Table I, p. 4, row 6 report
Lattice a	4.982 Å ± 0.014	973.15	YCu6 alloy: Cu 0.8322, Y 0.1678	experimental	[2] Fries 1994	Table I, p. 4, row 4 report
Lattice a	4.94 Å ± 0.002	1123.15	YCu6 alloy: Cu 0.8965, Y 0.1035	experimental	[2] Fries 1994	Table I, p. 4, row 3 report
Lattice a	4.985 Å ± 0.003	1123.15	YCu6 alloy: Cu 0.8341, Y 0.1659	experimental	[2] Fries 1994	Table I, p. 4, row 1 report
Lattice a	4.96 Å ± 0.001	1123.15	YCu6 alloy: Cu 0.8619, Y 0.1381	experimental	[2] Fries 1994	Table I, p. 4, row 2 report
Lattice c	4.124 Å ± 0.004	973.15	YCu6 alloy: Cu 0.8427, Y 0.1573	experimental	[2] Fries 1994	Table I, p. 4, row 5 report
Lattice c	4.15 Å ± 0.005	973.15	YCu6 alloy: Cu 0.881, Y 0.119	experimental	[2] Fries 1994	Table I, p. 4, row 6 report
Lattice c	4.122 Å ± 0.021	973.15	YCu6 alloy: Cu 0.8322, Y 0.1678	experimental	[2] Fries 1994	Table I, p. 4, row 4 report
Lattice c	4.152 Å ± 0.002	1123.15	YCu6 alloy: Cu 0.8965, Y 0.1035	experimental	[2] Fries 1994	Table I, p. 4, row 3 report
Lattice c	4.122 Å ± 0.004	1123.15	YCu6 alloy: Cu 0.8341, Y 0.1659	experimental	[2] Fries 1994	Table I, p. 4, row 1 report
Lattice c	4.142 Å ± 0.001	1123.15	YCu6 alloy: Cu 0.8619, Y 0.1381	experimental	[2] Fries 1994	Table I, p. 4, row 2 report
lattice c a	0.827 not_printed	973.15	YCu6 alloy: Cu 0.8427, Y 0.1573	experimental	[2] Fries 1994	Table I, p. 4, row 5 report
lattice c a	0.839 not_printed	973.15	YCu6 alloy: Cu 0.881, Y 0.119	experimental	[2] Fries 1994	Table I, p. 4, row 6 report
lattice c a	0.827 not_printed	973.15	YCu6 alloy: Cu 0.8322, Y 0.1678	experimental	[2] Fries 1994	Table I, p. 4, row 4 report
lattice c a	0.84 not_printed	1123.15	YCu6 alloy: Cu 0.8965, Y 0.1035	experimental	[2] Fries 1994	Table I, p. 4, row 3 report
lattice c a	0.827 not_printed	1123.15	YCu6 alloy: Cu 0.8341, Y 0.1659	experimental	[2] Fries 1994	Table I, p. 4, row 1 report
lattice c a	0.835 not_printed	1123.15	YCu6 alloy: Cu 0.8619, Y 0.1381	experimental	[2] Fries 1994	Table I, p. 4, row 2 report

Sources

Reporting papers the values were read from (a value cited from another work names that work in its row).

I. Ansara, A. T. Dinsdale, M. H. Rand (eds.), COST 507: Thermochemical database for light metal alloys, Volume 2, EUR 18499 EN, Office for Official Publications of the European Communities, Luxembourg (1998), ISBN 92-828-3902-8.
S. G. Fries, H. L. Lukas, R. Konetzki, R. Schmid-Fetzer, Experimental investigation and thermodynamic optimization of the Y-Cu binary system, JPE 15, 606-614 (1994). doi:10.1007/bf02647621

Please cite

R. Arróyave, J. Saal, D. Shin, ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature (version 2026.10; Version 1, machine-extracted), Zenodo (2026). doi:10.5281/zenodo.23735569
R. Arróyave, J. Saal, D. Shin, ORCHID-Diagrams: calculated binary phase diagrams (version 2026.10), Zenodo (2026). doi:10.5281/zenodo.23735859
R. Arróyave, J. Saal, D. Shin, ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD) (version 2026.10), Zenodo (2026). doi:10.5281/zenodo.23735891
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 the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work); 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). 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_literature_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735569},
  url       = {https://doi.org/10.5281/zenodo.23735569},
  note      = {Version 1, machine-extracted}
}

@misc{orchid_phase_diagrams_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Diagrams: calculated binary phase diagrams}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735859},
  url       = {https://doi.org/10.5281/zenodo.23735859}
}

@misc{orchid_hulls_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD)}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735891},
  url       = {https://doi.org/10.5281/zenodo.23735891}
}

@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}
}