Fe–Ni phases

10 phases (tier A 6, liquid 1, needs_review 3); 8 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 · Fe–Ni system page · Markdown · field reference

Phases of the Fe–Ni system (10)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_4SL phase:fe-ni:bcc-4sl		needs_review	stable in 1 of 1 calculated diagram(s): 300.06–1194.76 K, x(Ni) 0–0.06474	2	1
BCC_A2 phase:fe-ni:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 12 of 12 calculated diagram(s): 300–1814.99 K, x(Ni) 0–0.09129	19	15
B2_BCC phase:fe-ni:bcc-b2	CsCl · B2 · cP2 · Pm-3m (221)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–1810.96 K, x(Ni) 0–1	0	3
DIS_BCC phase:fe-ni:bcc-dis		needs_review	not stable in 1 calculated diagram(s)	0	1
FCC_4SL phase:fe-ni:fcc-4sl		needs_review	stable in 5 of 5 calculated diagram(s): 300–1791.47 K, x(Ni) 0–1	12	5
FCC_A1 phase:fe-ni:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 12 of 12 calculated diagram(s): 300–2499.51 K, x(Ni) 0–1	12	20
L12_FCC phase:fe-ni:fcc-l12	AuCu3 · L1_2 · cP4 · Pm-3m (221)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–1788.8 K, x(Ni) 0–0.99805	0	3
FENI3_L12 phase:fe-ni:feni3-l12	AuCu3 · L1_2 · cP4 · Pm-3m (221)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–785.65 K, x(Ni) 0.62096–0.88854	0	1
HCP_A3 phase:fe-ni:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 12 calculated diagram(s)	0	12
LIQUID phase:fe-ni:liquid	liquid	liquid	stable in 12 of 12 calculated diagram(s): 1620.56–2500 K, x(Ni) 0–1	5	12

BCC_4SL (Fe–Ni)

Id: phase:fe-ni:bcc-4sl; status needs_review
No structure assigned. Why: order_disorder_ambiguity:FeNi-10Cac.tdb_model_is_partitioned; unrecognised_name_tokens:4SL
Candidate (name_token): W · A2 · cI2 · Im-3m (229) — Strukturbericht/word 'A2' in the TDB name
Candidate (tdb_comment): CsCl · cP2 · Pm-3m — FeNi-10Cac.tdb: 'Prototype CsCl (cP2, Pm-3m)'
Stability: stable in 1 of 1 calculated diagram(s): 300.06–1194.76 K, x(Ni) 0–0.06474
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:fe-ni:bcc-4sl
paper: paper:10.1016/j.intermet.2010.02.026:FeNi B32
tdb: tdb:FeNi-10Cac.tdb:BCC_4SL

TDB models of BCC_4SL (1): PHASE and CONSTITUENT statements as written

FeNi-10Cac.tdb: BCC_4SL, type code %BP, sha256 37c0af627bda5989…

63: PHASE BCC_4SL:B %BP 5 0.25 0.25 0.25 0.25 3 !
64: CONST BCC_4SL:B : FE NI : FE NI : FE NI : FE NI : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.intermet.2010.02.026 G. Cacciamani, A. Dinsdale, M. Palumbo, A. Pasturel, The Fe–Ni system: Thermodynamic modelling assisted by atomistic calculations, Intermetallics 18, 1148-1162 (2010).
assessment that models this phase; reports values for this phase

BCC_A2 (Fe–Ni)

Id: phase:fe-ni: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 12 of 12 calculated diagram(s): 300–1814.99 K, x(Ni) 0–0.09129
Literature: 19 values (19 accepted) from 2 papers
Interactive: phase registry entry

Names (19): corpus: corpus:phase:fe-ni:bcc-a2
paper: paper:10.1016/j.actamat.2010.09.055:bcc, paper:10.1016/j.intermet.2010.02.026:α-Fe, paper:10.1016/j.intermet.2010.02.026:δ-Fe
tdb: tdb:FeNi-00Ans-2SL.tdb:BCC_A2, tdb:FeNi-00Ans-4SL.tdb:BCC_A2, tdb:FeNi-03Dup-LB.tdb:A2_BCC, tdb:FeNi-03Dup-LB.tdb:BCC_A2, tdb:FeNi-03Dup-mod.tdb:A2_BCC, tdb:FeNi-03Dup-mod.tdb:BCC_A2, tdb:FeNi-10Cac.tdb:A2_BCC, tdb:FeNi-10Cac.tdb:BCC_A2, tdb:FeNi-11Xio.tdb:BCC_A2, tdb:FeNi-19Ohn.tdb:BCC_A2, tdb:FeNi-23Jac.tdb:BCC_A2, tdb:FeNi-23Wit.tdb:BCC_A2, tdb:FeNi-23Zha.tdb:BCC_A2, tdb:FeNi-85Xin.tdb:BCC_A2, tdb:FeNi-95Ans.tdb:BCC_A2

TDB models of BCC_A2 (15): PHASE and CONSTITUENT statements as written

FeNi-00Ans-2SL.tdb: BCC_A2, type code %B, sha256 79b9e2435a00dd13…

47: PHASE BCC_A2 %B 2 1 3 !
48: CONST BCC_A2 : FE% NI : VA : !

FeNi-00Ans-4SL.tdb: BCC_A2, type code %B, sha256 a4d9738122fd5737…

48: PHASE BCC_A2 %B 2 1 3 !
49: CONST BCC_A2 : FE% NI : VA : !

FeNi-03Dup-LB.tdb: A2_BCC, type code %B, sha256 f10470dbf794292e…

63: PHASE A2_BCC %B 2 1 3 !
64: CONST A2_BCC : FE% NI VA : VA : !

FeNi-03Dup-LB.tdb: BCC_A2, type code %B, sha256 f10470dbf794292e…

58: PHASE BCC_A2 %B 2 1 3 !
59: CONST BCC_A2 : FE% NI : VA : !

FeNi-03Dup-mod.tdb: A2_BCC, type code %B, sha256 7ec5d4a5548add69…

74: PHASE A2_BCC %B 2 1 3 !
75: CONST A2_BCC : FE% NI VA : VA : !

FeNi-03Dup-mod.tdb: BCC_A2, type code %B, sha256 7ec5d4a5548add69…

69: PHASE BCC_A2 %B 2 1 3 !
70: CONST BCC_A2 : FE% NI : VA : !

FeNi-10Cac.tdb: A2_BCC, type code %B, sha256 37c0af627bda5989…

48: PHASE A2_BCC %B 2 1 3 !
49: CONST A2_BCC : FE% NI VA : VA : !

FeNi-10Cac.tdb: BCC_A2, type code %B, sha256 37c0af627bda5989…

43: PHASE BCC_A2 %B 2 1 3 !
44: CONST BCC_A2 : FE% NI : VA : !

FeNi-11Xio.tdb: BCC_A2, type code %B, sha256 220b0102be824879…

36: PHASE BCC_A2 %B 2 1 3 !
37: CONST BCC_A2 : FE% NI : VA : !

FeNi-19Ohn.tdb: BCC_A2, type code %B, sha256 ce2ce2a7c3f6c475…

46: PHASE BCC_A2 %B 2 1 3 !
47: CONST BCC_A2 : FE% NI : VA : !

FeNi-23Jac.tdb: BCC_A2, type code %B, sha256 1c6890e44cf1a0f4…

36: PHASE BCC_A2 %B 2 1 3 !
37: CONST BCC_A2 : FE% NI : VA : !

FeNi-23Wit.tdb: BCC_A2, type code %B, sha256 65e467a6d693b565…

35: PHASE BCC_A2 %B 2 1 3 !
36: CONST BCC_A2 : FE% NI : VA : !

FeNi-23Zha.tdb: BCC_A2, type code %B, sha256 c205b78c12aa1e73…

45: PHASE BCC_A2 %B 2 1 3 !
46: CONST BCC_A2 : FE% NI : VA : !

FeNi-85Xin.tdb: BCC_A2, type code %B, sha256 89060926e9804263…

34: PHASE BCC_A2 %B 2 1 3 !
35: CONST BCC_A2 : FE% NI : VA : !

FeNi-95Ans.tdb: BCC_A2, type code %B, sha256 e629405a3fc1ba63…

47: PHASE BCC_A2 %B 2 1 3 !
48: CONST BCC_A2 : FE% NI : VA : !

Example references (8 of 8; assessments first):

doi:10.1016/j.actamat.2010.09.055 W. Xiong, H. Zhang, L. Vitos, M. Selleby, Magnetic phase diagram of the Fe–Ni system, Acta Materialia 59, 521-530 (2011).
assessment that models this phase; reports values for this phase
doi:10.1016/j.intermet.2010.02.026 G. Cacciamani, A. Dinsdale, M. Palumbo, A. Pasturel, The Fe–Ni system: Thermodynamic modelling assisted by atomistic calculations, Intermetallics 18, 1148-1162 (2010).
assessment that models this phase; reports values for this phase
doi:10.1007/s42243-022-00846-9 Z.-T. Zhang, J.-J. Wang, W. Liu, X.-G. Lu, J. Iron Steel Res. Int., 30, 660-76(2023).
assessment that models this phase
doi:10.1016/j.calphad.2019.101677 I. Ohnuma, S. Shimenouchi, T. Omori, K. Ishida, R. Kainuma, Calphad, 67, 101677, 2019.
assessment that models this phase
doi:10.1016/j.calphad.2023.102531 A. Jacob, E. Povoden-Karadeniz, P. Retzl, E. Kozeschnik, Calphad, 81, 102531(2023).
assessment that models this phase
doi:10.1016/j.jallcom.2022.168118 V.T. Witusiewicz, O. Stryzhyboroda, S. Vinke, K. Bobzin, U. Hecht, Experimental study and thermodynamic modelling of the ternary system Fe–Ni–Si with re-modelling of the constituent binary systems, Journal of Alloys and Compounds 935, 168118 (2023).
assessment that models this phase
doi:10.1007/bf02649918 L. J. Swartzendruber, V. P. Itkin, C. B. Alcock, The Fe-Ni (iron-nickel) system, JPE 12, 288-312 (1991).
cited as the source of values for this phase
doi:10.1016/j.intermet.2005.11.028 G. Cacciamani, J. De Keyzer, R. Ferro, U.E. Klotz, J. Lacaze, P. Wollants, Critical evaluation of the Fe–Ni, Fe–Ti and Fe–Ni–Ti alloy systems, Intermetallics 14, 1312-1325 (2006).
cited as the source of values for this phase

B2_BCC (Fe–Ni)

Id: phase:fe-ni:bcc-b2; status assigned
Structure: CsCl · B2 · cP2 · Pm-3m (221); type st:b2-cscl-cp2; tier A: standard phase name; confidence high
Caveat: FeNi-03Dup-LB.tdb: ordered phase with disordered part A2_BCC (order/disorder model)
Caveat: FeNi-03Dup-mod.tdb: ordered phase with disordered part A2_BCC (order/disorder model)
Caveat: FeNi-10Cac.tdb: ordered phase with disordered part A2_BCC (order/disorder model)
Caveat: partitioned order/disorder model in FeNi-03Dup-LB.tdb also describes the disordered state
Caveat: partitioned order/disorder model in FeNi-03Dup-mod.tdb also describes the disordered state
Caveat: partitioned order/disorder model in FeNi-10Cac.tdb also describes the disordered state
Stability: stable in 3 of 3 calculated diagram(s): 300–1810.96 K, x(Ni) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:fe-ni:bcc-b2
tdb: tdb:FeNi-03Dup-LB.tdb:B2_BCC, tdb:FeNi-03Dup-mod.tdb:B2_BCC, tdb:FeNi-10Cac.tdb:B2_BCC

TDB models of B2_BCC (3): PHASE and CONSTITUENT statements as written

FeNi-03Dup-LB.tdb: B2_BCC, type code %BO, sha256 f10470dbf794292e…

68: PHASE B2_BCC %BO 3 0.5 0.5 3 !
69: CONST B2_BCC : FE NI VA : FE% NI% VA : VA : !

FeNi-03Dup-mod.tdb: B2_BCC, type code %BO, sha256 7ec5d4a5548add69…

79: PHASE B2_BCC %BO 3 0.5 0.5 3 !
80: CONST B2_BCC : FE NI VA : FE% NI% VA : VA : !

FeNi-10Cac.tdb: B2_BCC, type code %BO, sha256 37c0af627bda5989…

53: PHASE B2_BCC %BO 3 0.5 0.5 3 !
54: CONST B2_BCC : FE NI VA : FE% NI% VA : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.intermet.2010.02.026 G. Cacciamani, A. Dinsdale, M. Palumbo, A. Pasturel, The Fe–Ni system: Thermodynamic modelling assisted by atomistic calculations, Intermetallics 18, 1148-1162 (2010).
assessment that models this phase

DIS_BCC (Fe–Ni)

Id: phase:fe-ni:bcc-dis; status needs_review
No structure assigned. Why: unrecognised_name_tokens:DIS
Candidate (name_token): W · A2 · cI2 · Im-3m (229) — Strukturbericht/word 'A2' in the TDB name
Stability: not stable in 1 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:fe-ni:bcc-dis
tdb: tdb:FeNi-10Cac.tdb:DIS_BCC

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

FeNi-10Cac.tdb: DIS_BCC, type code %B, sha256 37c0af627bda5989…

58: PHASE DIS_BCC %B 2 1 3 !
59: CONST DIS_BCC : FE% NI : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.intermet.2010.02.026 G. Cacciamani, A. Dinsdale, M. Palumbo, A. Pasturel, The Fe–Ni system: Thermodynamic modelling assisted by atomistic calculations, Intermetallics 18, 1148-1162 (2010).
assessment that models this phase

FCC_4SL (Fe–Ni)

Id: phase:fe-ni:fcc-4sl; status needs_review
No structure assigned. Why: order_disorder_ambiguity:FeNi-00Ans-4SL.tdb_model_is_partitioned; order_disorder_ambiguity:FeNi-03Dup-LB.tdb_model_is_partitioned; order_disorder_ambiguity:FeNi-03Dup-mod.tdb_model_is_partitioned; order_disorder_ambiguity:FeNi-10Cac.tdb_model_is_partitioned; order_disorder_ambiguity:FeNi-19Ohn.tdb_model_is_partitioned; sgte_mmc2_row_disagrees_with_name:FCC_4SL; sgte_mmc2_rows_disagree; unrecognised_name_tokens:4SL
Candidate (dft_mp): P4/mmm (123) — on-hull MP FeNi at x(NI)=0.5000
Candidate (dft_mp): Pm-3m (221) — on-hull MP FeNi3 at x(NI)=0.7500
Candidate (dft_oqmd): P4/mmm (123) — on-hull OQMD Fe1 Ni1 at x(NI)=0.5000
Candidate (dft_oqmd): Pm-3m (221) — on-hull OQMD Fe1 Ni3 at x(NI)=0.7500
Candidate (dft_oqmd): I4/mmm (139) — on-hull OQMD Fe1 Ni8 at x(NI)=0.8889
Candidate (literature_printed): AuCu · tP4 — printed with a label mapped to this phase
Candidate (name_token): Cu · A1 · cF4 · Fm-3m (225) — Strukturbericht/word 'A1' in the TDB name
Candidate (sgte_mmc2): AuCu · L1_0 · tP4 · P4/mmm (123) — Hallstedt 2025 mmc2 row for FCC_4SL: AlTi, AuCu, CoPt, CrPt, FeNi, FePt, MnNi
Stability: stable in 5 of 5 calculated diagram(s): 300–1791.47 K, x(Ni) 0–1
Literature: 12 values (12 accepted) from 1 papers
Interactive: phase registry entry

Names (10): corpus: corpus:phase:fe-ni:fcc-4sl
paper: paper:10.1016/j.intermet.2010.02.026:Fe3Ni L12, paper:10.1016/j.intermet.2010.02.026:FeNi L10, paper:10.1016/j.intermet.2010.02.026:FeNi3, paper:10.1016/j.intermet.2010.02.026:FeNi3 L12
tdb: tdb:FeNi-00Ans-4SL.tdb:FCC_4SL, tdb:FeNi-03Dup-LB.tdb:FCC_4SL, tdb:FeNi-03Dup-mod.tdb:FCC_4SL, tdb:FeNi-10Cac.tdb:FCC_4SL, tdb:FeNi-19Ohn.tdb:FCC_4SL

TDB models of FCC_4SL (5): PHASE and CONSTITUENT statements as written

FeNi-00Ans-4SL.tdb: FCC_4SL, type code %AY, sha256 a4d9738122fd5737…

43: PHASE FCC_4SL %AY 5 0.25 0.25 0.25 0.25 1 !
44: CONST FCC_4SL : FE NI% : FE NI% : FE NI% : FE% NI : VA :  !

FeNi-03Dup-LB.tdb: FCC_4SL, type code %AY, sha256 f10470dbf794292e…

53: PHASE FCC_4SL:F %AY 5 0.25 0.25 0.25 0.25 1 !
54: CONST FCC_4SL:F : FE NI% : FE NI% : FE NI% : FE% NI : VA :  !

FeNi-03Dup-mod.tdb: FCC_4SL, type code %AY, sha256 7ec5d4a5548add69…

64: PHASE FCC_4SL:F %AY 5 0.25 0.25 0.25 0.25 1 !
65: CONST FCC_4SL:F : FE NI% : FE NI% : FE NI% : FE% NI : VA :  !

FeNi-10Cac.tdb: FCC_4SL, type code %AY, sha256 37c0af627bda5989…

38: PHASE FCC_4SL:F %AY 5 0.25 0.25 0.25 0.25 1 !
39: CONST FCC_4SL:F : FE NI% : FE NI% : FE NI% : FE% NI : VA :  !

FeNi-19Ohn.tdb: FCC_4SL, type code %AY, sha256 ce2ce2a7c3f6c475…

41: PHASE FCC_4SL %AY 5 0.25 0.25 0.25 0.25 1 !
42: CONST FCC_4SL : FE NI% : FE NI% : FE NI% : FE% NI : VA :  !

Example references (4 of 4; assessments first):

doi:10.1016/j.intermet.2010.02.026 G. Cacciamani, A. Dinsdale, M. Palumbo, A. Pasturel, The Fe–Ni system: Thermodynamic modelling assisted by atomistic calculations, Intermetallics 18, 1148-1162 (2010).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2019.101677 I. Ohnuma, S. Shimenouchi, T. Omori, K. Ishida, R. Kainuma, Calphad, 67, 101677, 2019.
assessment that models this phase
doi:10.1007/bf02649918 L. J. Swartzendruber, V. P. Itkin, C. B. Alcock, The Fe-Ni (iron-nickel) system, JPE 12, 288-312 (1991).
cited as the source of values for this phase
doi:10.1016/j.intermet.2005.11.028 G. Cacciamani, J. De Keyzer, R. Ferro, U.E. Klotz, J. Lacaze, P. Wollants, Critical evaluation of the Fe–Ni, Fe–Ti and Fe–Ni–Ti alloy systems, Intermetallics 14, 1312-1325 (2006).
cited as the source of values for this phase

FCC_A1 (Fe–Ni)

Id: phase:fe-ni: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 12 of 12 calculated diagram(s): 300–2499.51 K, x(Ni) 0–1
Literature: 12 values (12 accepted) from 1 papers
Interactive: phase registry entry

Names (23): corpus: corpus:phase:fe-ni:fcc-a1
paper: paper:10.1016/j.intermet.2010.02.026:γ-(Fe,Ni), paper:10.1016/j.intermet.2010.02.026:γ-(Fe,Ni)FM
tdb: tdb:FeNi-00Ans-2SL.tdb:A1_FCC, tdb:FeNi-00Ans-2SL.tdb:FCC_A1, tdb:FeNi-00Ans-4SL.tdb:A1_FCC, tdb:FeNi-00Ans-4SL.tdb:FCC_A1, tdb:FeNi-03Dup-LB.tdb:A1_FCC, tdb:FeNi-03Dup-LB.tdb:FCC_A1, tdb:FeNi-03Dup-mod.tdb:A1_FCC, tdb:FeNi-03Dup-mod.tdb:FCC_A1, tdb:FeNi-10Cac.tdb:A1_FCC, tdb:FeNi-10Cac.tdb:FCC_A1, tdb:FeNi-11Xio.tdb:FCC_A1, tdb:FeNi-19Ohn.tdb:A1_FCC, tdb:FeNi-19Ohn.tdb:FCC_A1, tdb:FeNi-23Jac.tdb:FCC_A1, tdb:FeNi-23Wit.tdb:FCC_A1, tdb:FeNi-23Zha.tdb:A1_FCC, tdb:FeNi-23Zha.tdb:FCC_A1, tdb:FeNi-85Xin.tdb:FCC_A1, tdb:FeNi-95Ans.tdb:A1_FCC, tdb:FeNi-95Ans.tdb:FCC_A1

TDB models of FCC_A1 (20): PHASE and CONSTITUENT statements as written

FeNi-00Ans-2SL.tdb: A1_FCC, type code %A, sha256 79b9e2435a00dd13…

37: PHASE A1_FCC %A 2 1 1 !
38: CONST A1_FCC : FE NI : VA : !

FeNi-00Ans-2SL.tdb: FCC_A1, type code %A, sha256 79b9e2435a00dd13…

32: PHASE FCC_A1 %A 2 1 1 !
33: CONST FCC_A1 : FE NI : VA : !

FeNi-00Ans-4SL.tdb: A1_FCC, type code %A, sha256 a4d9738122fd5737…

38: PHASE A1_FCC %A 2 1 1 !
39: CONST A1_FCC : FE NI : VA : !

FeNi-00Ans-4SL.tdb: FCC_A1, type code %A, sha256 a4d9738122fd5737…

33: PHASE FCC_A1 %A 2 1 1 !
34: CONST FCC_A1 : FE NI : VA : !

FeNi-03Dup-LB.tdb: A1_FCC, type code %A, sha256 f10470dbf794292e…

48: PHASE A1_FCC %A 2 1 1 !
49: CONST A1_FCC : FE NI : VA : !

FeNi-03Dup-LB.tdb: FCC_A1, type code %A, sha256 f10470dbf794292e…

43: PHASE FCC_A1 %A 2 1 1 !
44: CONST FCC_A1 : FE NI : VA : !

FeNi-03Dup-mod.tdb: A1_FCC, type code %A, sha256 7ec5d4a5548add69…

59: PHASE A1_FCC %A 2 1 1 !
60: CONST A1_FCC : FE NI : VA : !

FeNi-03Dup-mod.tdb: FCC_A1, type code %A, sha256 7ec5d4a5548add69…

54: PHASE FCC_A1 %A 2 1 1 !
55: CONST FCC_A1 : FE NI : VA : !

FeNi-10Cac.tdb: A1_FCC, type code %A, sha256 37c0af627bda5989…

33: PHASE A1_FCC %A 2 1 1 !
34: CONST A1_FCC : FE NI : VA : !

FeNi-10Cac.tdb: FCC_A1, type code %A, sha256 37c0af627bda5989…

28: PHASE FCC_A1 %A 2 1 1 !
29: CONST FCC_A1 : FE NI : VA : !

FeNi-11Xio.tdb: FCC_A1, type code %A, sha256 220b0102be824879…

31: PHASE FCC_A1 %A 2 1 1 !
32: CONST FCC_A1 : FE NI : VA : !

FeNi-19Ohn.tdb: A1_FCC, type code %A, sha256 ce2ce2a7c3f6c475…

36: PHASE A1_FCC %A 2 1 1 !
37: CONST A1_FCC : FE NI : VA : !

FeNi-19Ohn.tdb: FCC_A1, type code %A, sha256 ce2ce2a7c3f6c475…

31: PHASE FCC_A1 %A 2 1 1 !
32: CONST FCC_A1 : FE NI : VA : !

FeNi-23Jac.tdb: FCC_A1, type code %A, sha256 1c6890e44cf1a0f4…

31: PHASE FCC_A1 %A 2 1 1 !
32: CONST FCC_A1 : FE NI : VA : !

FeNi-23Wit.tdb: FCC_A1, type code %A, sha256 65e467a6d693b565…

30: PHASE FCC_A1 %A 2 1 1 !
31: CONST FCC_A1 : FE NI : VA : !

FeNi-23Zha.tdb: A1_FCC, type code %A, sha256 c205b78c12aa1e73…

35: PHASE A1_FCC %A 2 1 1 !
36: CONST A1_FCC : FE NI : VA : !

FeNi-23Zha.tdb: FCC_A1, type code %A, sha256 c205b78c12aa1e73…

30: PHASE FCC_A1 %A 2 1 1 !
31: CONST FCC_A1 : FE NI : VA : !

FeNi-85Xin.tdb: FCC_A1, type code %A, sha256 89060926e9804263…

29: PHASE FCC_A1 %A 2 1 1 !
30: CONST FCC_A1 : FE NI : VA : !

FeNi-95Ans.tdb: A1_FCC, type code %A, sha256 e629405a3fc1ba63…

37: PHASE A1_FCC %A 2 1 1 !
38: CONST A1_FCC : FE NI : VA : !

FeNi-95Ans.tdb: FCC_A1, type code %A, sha256 e629405a3fc1ba63…

32: PHASE FCC_A1 %A 2 1 1 !
33: CONST FCC_A1 : FE NI : VA : !

Example references (8 of 8; assessments first):

doi:10.1016/j.intermet.2010.02.026 G. Cacciamani, A. Dinsdale, M. Palumbo, A. Pasturel, The Fe–Ni system: Thermodynamic modelling assisted by atomistic calculations, Intermetallics 18, 1148-1162 (2010).
assessment that models this phase; reports values for this phase
doi:10.1007/s42243-022-00846-9 Z.-T. Zhang, J.-J. Wang, W. Liu, X.-G. Lu, J. Iron Steel Res. Int., 30, 660-76(2023).
assessment that models this phase
doi:10.1016/j.actamat.2010.09.055 W. Xiong, H. Zhang, L. Vitos, M. Selleby, Magnetic phase diagram of the Fe–Ni system, Acta Materialia 59, 521-530 (2011).
assessment that models this phase
doi:10.1016/j.calphad.2019.101677 I. Ohnuma, S. Shimenouchi, T. Omori, K. Ishida, R. Kainuma, Calphad, 67, 101677, 2019.
assessment that models this phase
doi:10.1016/j.calphad.2023.102531 A. Jacob, E. Povoden-Karadeniz, P. Retzl, E. Kozeschnik, Calphad, 81, 102531(2023).
assessment that models this phase
doi:10.1016/j.jallcom.2022.168118 V.T. Witusiewicz, O. Stryzhyboroda, S. Vinke, K. Bobzin, U. Hecht, Experimental study and thermodynamic modelling of the ternary system Fe–Ni–Si with re-modelling of the constituent binary systems, Journal of Alloys and Compounds 935, 168118 (2023).
assessment that models this phase
doi:10.1016/j.intermet.2005.11.028 G. Cacciamani, J. De Keyzer, R. Ferro, U.E. Klotz, J. Lacaze, P. Wollants, Critical evaluation of the Fe–Ni, Fe–Ti and Fe–Ni–Ti alloy systems, Intermetallics 14, 1312-1325 (2006).
cited as the source of values for this phase
doi:10.1007/bf02649918 L. J. Swartzendruber, V. P. Itkin, C. B. Alcock, The Fe-Ni (iron-nickel) system, JPE 12, 288-312 (1991).
cited as the source of values for this phase

L12_FCC (Fe–Ni)

Id: phase:fe-ni:fcc-l12; status assigned
Structure: AuCu3 · L1_2 · cP4 · Pm-3m (221); type st:l1-2-aucu3-cp4; tier A: standard phase name; confidence high
Caveat: FeNi-00Ans-2SL.tdb: ordered phase with disordered part A1_FCC (order/disorder model)
Caveat: FeNi-23Zha.tdb: ordered phase with disordered part A1_FCC (order/disorder model)
Caveat: FeNi-95Ans.tdb: ordered phase with disordered part A1_FCC (order/disorder model)
Caveat: partitioned order/disorder model in FeNi-00Ans-2SL.tdb also describes the disordered state
Caveat: partitioned order/disorder model in FeNi-23Zha.tdb also describes the disordered state
Caveat: partitioned order/disorder model in FeNi-95Ans.tdb also describes the disordered state
Stability: stable in 3 of 3 calculated diagram(s): 300–1788.8 K, x(Ni) 0–0.99805
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:fe-ni:fcc-l12
tdb: tdb:FeNi-00Ans-2SL.tdb:L12_FCC, tdb:FeNi-23Zha.tdb:L12_FCC, tdb:FeNi-95Ans.tdb:L12_FCC

TDB models of L12_FCC (3): PHASE and CONSTITUENT statements as written

FeNi-00Ans-2SL.tdb: L12_FCC, type code %AY, sha256 79b9e2435a00dd13…

42: PHASE L12_FCC %AY 3 0.75 0.25 1 !
43: CONST L12_FCC : FE NI% : FE% NI : VA :  !

FeNi-23Zha.tdb: L12_FCC, type code %AY, sha256 c205b78c12aa1e73…

40: PHASE L12_FCC %AY 3 0.75 0.25 1 !
41: CONST L12_FCC : FE NI% : FE% NI : VA :  !

FeNi-95Ans.tdb: L12_FCC, type code %AY, sha256 e629405a3fc1ba63…

42: PHASE L12_FCC %AY 3 0.75 0.25 1 !
43: CONST L12_FCC : FE NI% : FE% NI : VA :  !

Example references (1 of 1; assessments first):

doi:10.1007/s42243-022-00846-9 Z.-T. Zhang, J.-J. Wang, W. Liu, X.-G. Lu, J. Iron Steel Res. Int., 30, 660-76(2023).
assessment that models this phase

FENI3_L12 (Fe–Ni)

Id: phase:fe-ni:feni3-l12; status assigned
Structure: AuCu3 · L1_2 · cP4 · Pm-3m (221); type st:l1-2-aucu3-cp4; tier A: standard phase name; confidence high
Caveat: partitioned order/disorder model in FeNi-23Wit.tdb also describes the disordered state
Stability: stable in 1 of 1 calculated diagram(s): 300–785.65 K, x(Ni) 0.62096–0.88854
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:fe-ni:feni3-l12
tdb: tdb:FeNi-23Wit.tdb:FENI3_L12

TDB models of FENI3_L12 (1): PHASE and CONSTITUENT statements as written

FeNi-23Wit.tdb: FENI3_L12, type code %A, sha256 65e467a6d693b565…

45: PHASE FENI3_L12 %A 3 0.75 0.25 1 !
46: CONST FENI3_L12 : FE NI% : FE% NI : VA :  !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2022.168118 V.T. Witusiewicz, O. Stryzhyboroda, S. Vinke, K. Bobzin, U. Hecht, Experimental study and thermodynamic modelling of the ternary system Fe–Ni–Si with re-modelling of the constituent binary systems, Journal of Alloys and Compounds 935, 168118 (2023).
assessment that models this phase

HCP_A3 (Fe–Ni)

Id: phase:fe-ni: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 12 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (13): corpus: corpus:phase:fe-ni:hcp-a3
tdb: tdb:FeNi-00Ans-2SL.tdb:HCP_A3, tdb:FeNi-00Ans-4SL.tdb:HCP_A3, tdb:FeNi-03Dup-LB.tdb:HCP_A3, tdb:FeNi-03Dup-mod.tdb:HCP_A3, tdb:FeNi-10Cac.tdb:HCP_A3, tdb:FeNi-11Xio.tdb:HCP_A3, tdb:FeNi-19Ohn.tdb:HCP_A3, tdb:FeNi-23Jac.tdb:HCP_A3, tdb:FeNi-23Wit.tdb:HCP_A3, tdb:FeNi-23Zha.tdb:HCP_A3, tdb:FeNi-85Xin.tdb:HCP_A3, tdb:FeNi-95Ans.tdb:HCP_A3

TDB models of HCP_A3 (12): PHASE and CONSTITUENT statements as written

FeNi-00Ans-2SL.tdb: HCP_A3, type code %, sha256 79b9e2435a00dd13…

52: PHASE HCP_A3 % 2 1 0.5 !
53: CONST HCP_A3 : FE NI : VA : !

FeNi-00Ans-4SL.tdb: HCP_A3, type code %, sha256 a4d9738122fd5737…

53: PHASE HCP_A3 % 2 1 0.5 !
54: CONST HCP_A3 : FE NI : VA : !

FeNi-03Dup-LB.tdb: HCP_A3, type code %A, sha256 f10470dbf794292e…

73: PHASE HCP_A3 %A 2 1 0.5 !
74: CONST HCP_A3 : FE NI : VA : !

FeNi-03Dup-mod.tdb: HCP_A3, type code %A, sha256 7ec5d4a5548add69…

84: PHASE HCP_A3 %A 2 1 0.5 !
85: CONST HCP_A3 : FE NI : VA : !

FeNi-10Cac.tdb: HCP_A3, type code %A, sha256 37c0af627bda5989…

68: PHASE HCP_A3 %A 2 1 0.5 !
69: CONST HCP_A3 : FE NI : VA : !

FeNi-11Xio.tdb: HCP_A3, type code %, sha256 220b0102be824879…

41: PHASE HCP_A3 % 2 1 0.5 !
42: CONST HCP_A3 : FE NI : VA : !

FeNi-19Ohn.tdb: HCP_A3, type code %A, sha256 ce2ce2a7c3f6c475…

51: PHASE HCP_A3 %A 2 1 0.5 !
52: CONST HCP_A3 : FE NI : VA : !

FeNi-23Jac.tdb: HCP_A3, type code %, sha256 1c6890e44cf1a0f4…

41: PHASE HCP_A3 % 2 1 0.5 !
42: CONST HCP_A3 : FE NI : VA : !

FeNi-23Wit.tdb: HCP_A3, type code %A, sha256 65e467a6d693b565…

40: PHASE HCP_A3 %A 2 1 0.5 !
41: CONST HCP_A3 : FE NI : VA : !

FeNi-23Zha.tdb: HCP_A3, type code %A, sha256 c205b78c12aa1e73…

50: PHASE HCP_A3 %A 2 1 0.5 !
51: CONST HCP_A3 : FE NI : VA : !

FeNi-85Xin.tdb: HCP_A3, type code %, sha256 89060926e9804263…

39: PHASE HCP_A3 % 2 1 0.5 !
40: CONST HCP_A3 : FE NI : VA : !

FeNi-95Ans.tdb: HCP_A3, type code %, sha256 e629405a3fc1ba63…

52: PHASE HCP_A3 % 2 1 0.5 !
53: CONST HCP_A3 : FE NI : VA : !

Example references (6 of 6; assessments first):

doi:10.1007/s42243-022-00846-9 Z.-T. Zhang, J.-J. Wang, W. Liu, X.-G. Lu, J. Iron Steel Res. Int., 30, 660-76(2023).
assessment that models this phase
doi:10.1016/j.actamat.2010.09.055 W. Xiong, H. Zhang, L. Vitos, M. Selleby, Magnetic phase diagram of the Fe–Ni system, Acta Materialia 59, 521-530 (2011).
assessment that models this phase
doi:10.1016/j.calphad.2019.101677 I. Ohnuma, S. Shimenouchi, T. Omori, K. Ishida, R. Kainuma, Calphad, 67, 101677, 2019.
assessment that models this phase
doi:10.1016/j.calphad.2023.102531 A. Jacob, E. Povoden-Karadeniz, P. Retzl, E. Kozeschnik, Calphad, 81, 102531(2023).
assessment that models this phase
doi:10.1016/j.intermet.2010.02.026 G. Cacciamani, A. Dinsdale, M. Palumbo, A. Pasturel, The Fe–Ni system: Thermodynamic modelling assisted by atomistic calculations, Intermetallics 18, 1148-1162 (2010).
assessment that models this phase
doi:10.1016/j.jallcom.2022.168118 V.T. Witusiewicz, O. Stryzhyboroda, S. Vinke, K. Bobzin, U. Hecht, Experimental study and thermodynamic modelling of the ternary system Fe–Ni–Si with re-modelling of the constituent binary systems, Journal of Alloys and Compounds 935, 168118 (2023).
assessment that models this phase

LIQUID (Fe–Ni)

Id: phase:fe-ni:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 12 of 12 calculated diagram(s): 1620.56–2500 K, x(Ni) 0–1
Literature: 5 values (5 accepted) from 1 papers
Interactive: phase registry entry

Names (14): corpus: corpus:phase:fe-ni:liquid
paper: paper:10.1016/j.intermet.2010.02.026:L
tdb: tdb:FeNi-00Ans-2SL.tdb:LIQUID, tdb:FeNi-00Ans-4SL.tdb:LIQUID, tdb:FeNi-03Dup-LB.tdb:LIQUID, tdb:FeNi-03Dup-mod.tdb:LIQUID, tdb:FeNi-10Cac.tdb:LIQUID, tdb:FeNi-11Xio.tdb:LIQUID, tdb:FeNi-19Ohn.tdb:LIQUID, tdb:FeNi-23Jac.tdb:LIQUID, tdb:FeNi-23Wit.tdb:LIQUID, tdb:FeNi-23Zha.tdb:LIQUID, tdb:FeNi-85Xin.tdb:LIQUID, tdb:FeNi-95Ans.tdb:LIQUID

TDB models of LIQUID (12): PHASE and CONSTITUENT statements as written

FeNi-00Ans-2SL.tdb: LIQUID, type code %, sha256 79b9e2435a00dd13…

27: PHASE LIQUID:L % 1 1 !
28: CONST LIQUID:L : FE NI : !

FeNi-00Ans-4SL.tdb: LIQUID, type code %, sha256 a4d9738122fd5737…

28: PHASE LIQUID:L % 1 1 !
29: CONST LIQUID:L : FE NI : !

FeNi-03Dup-LB.tdb: LIQUID, type code %, sha256 f10470dbf794292e…

38: PHASE LIQUID:L % 1 1 !
39: CONST LIQUID:L : FE NI : !

FeNi-03Dup-mod.tdb: LIQUID, type code %, sha256 7ec5d4a5548add69…

49: PHASE LIQUID:L % 1 1 !
50: CONST LIQUID:L : FE NI : !

FeNi-10Cac.tdb: LIQUID, type code %, sha256 37c0af627bda5989…

23: PHASE LIQUID:L % 1 1 !
24: CONST LIQUID:L : FE NI : !

FeNi-11Xio.tdb: LIQUID, type code %, sha256 220b0102be824879…

26: PHASE LIQUID:L % 1 1 !
27: CONST LIQUID:L : FE NI : !

FeNi-19Ohn.tdb: LIQUID, type code %, sha256 ce2ce2a7c3f6c475…

26: PHASE LIQUID:L % 1 1 !
27: CONST LIQUID:L : FE NI : !

FeNi-23Jac.tdb: LIQUID, type code %, sha256 1c6890e44cf1a0f4…

26: PHASE LIQUID:L % 1 1 !
27: CONST LIQUID:L : FE NI : !

FeNi-23Wit.tdb: LIQUID, type code %, sha256 65e467a6d693b565…

25: PHASE LIQUID:L % 1 1 !
26: CONST LIQUID:L : FE NI : !

FeNi-23Zha.tdb: LIQUID, type code %, sha256 c205b78c12aa1e73…

25: PHASE LIQUID:L % 1 1 !
26: CONST LIQUID:L : FE NI : !

FeNi-85Xin.tdb: LIQUID, type code %, sha256 89060926e9804263…

24: PHASE LIQUID:L % 1 1 !
25: CONST LIQUID:L : FE NI : !

FeNi-95Ans.tdb: LIQUID, type code %, sha256 e629405a3fc1ba63…

27: PHASE LIQUID:L % 1 1 !
28: CONST LIQUID:L : FE NI : !

Example references (8 of 8; assessments first):

doi:10.1016/j.intermet.2010.02.026 G. Cacciamani, A. Dinsdale, M. Palumbo, A. Pasturel, The Fe–Ni system: Thermodynamic modelling assisted by atomistic calculations, Intermetallics 18, 1148-1162 (2010).
assessment that models this phase; reports values for this phase
doi:10.1007/s42243-022-00846-9 Z.-T. Zhang, J.-J. Wang, W. Liu, X.-G. Lu, J. Iron Steel Res. Int., 30, 660-76(2023).
assessment that models this phase
doi:10.1016/j.actamat.2010.09.055 W. Xiong, H. Zhang, L. Vitos, M. Selleby, Magnetic phase diagram of the Fe–Ni system, Acta Materialia 59, 521-530 (2011).
assessment that models this phase
doi:10.1016/j.calphad.2019.101677 I. Ohnuma, S. Shimenouchi, T. Omori, K. Ishida, R. Kainuma, Calphad, 67, 101677, 2019.
assessment that models this phase
doi:10.1016/j.calphad.2023.102531 A. Jacob, E. Povoden-Karadeniz, P. Retzl, E. Kozeschnik, Calphad, 81, 102531(2023).
assessment that models this phase
doi:10.1016/j.jallcom.2022.168118 V.T. Witusiewicz, O. Stryzhyboroda, S. Vinke, K. Bobzin, U. Hecht, Experimental study and thermodynamic modelling of the ternary system Fe–Ni–Si with re-modelling of the constituent binary systems, Journal of Alloys and Compounds 935, 168118 (2023).
assessment that models this phase
doi:10.1007/bf02649918 L. J. Swartzendruber, V. P. Itkin, C. B. Alcock, The Fe-Ni (iron-nickel) system, JPE 12, 288-312 (1991).
cited as the source of values for this phase
doi:10.1016/j.intermet.2005.11.028 G. Cacciamani, J. De Keyzer, R. Ferro, U.E. Klotz, J. Lacaze, P. Wollants, Critical evaluation of the Fe–Ni, Fe–Ti and Fe–Ni–Ti alloy systems, Intermetallics 14, 1312-1325 (2006).
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}
}