Ni–W phases

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

Phases of the Ni–W system (9)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:ni-w:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–3999.86 K, x(W) 0.9917–1	5	3
NI4X_D1A phase:ni-w:d1a-ni4x	MoNi4 · D1_a · tI10 · I4/m (87)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 3 of 3 calculated diagram(s): 304.84–1290 K, x(W) 0.2–0.2	15	3
FCC_A1 phase:ni-w:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–1790.73 K, x(W) 0–0.17637	6	3
HCP_A3 phase:ni-w:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 3 calculated diagram(s)	0	3
LIQUID phase:ni-w:liquid	liquid	liquid	stable in 3 of 3 calculated diagram(s): 1728.25–4000 K, x(W) 0–1	1	3
NI3W_D0A phase:ni-w:ni3w-d0a	beta-Cu3Ti · D0_a · oP8 · Pmmn (59)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–848.8 K, x(W) 0.25–0.25	0	1
NI8W phase:ni-w:ni8w		needs_review	stable in 1 of 1 calculated diagram(s): 300–802.5 K, x(W) 0.11111–0.11111	0	1
NIW phase:ni-w:niw	MoNi · oP56 · P2_12_12_1 (19)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 2 of 2 calculated diagram(s): 300–1340.8 K, x(W) 0.5–0.5	10	2
NIW2 phase:ni-w:niw2		needs_review	stable in 2 of 2 calculated diagram(s): 300–1340 K, x(W) 0.66667–0.66667	2	2

BCC_A2 (Ni–W)

Id: phase:ni-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 3 of 3 calculated diagram(s): 300–3999.86 K, x(W) 0.9917–1
Literature: 5 values (5 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:ni-w:bcc-a2
paper: paper:10.1007/bf02817278:bcc(W)
tdb: tdb:NiW-08Pop.tdb:BCC_A2, tdb:NiW-17Iso.tdb:BCC_A2, tdb:NiW-86Fer-LB.tdb:BCC_A2

TDB models of BCC_A2 (3): PHASE and CONSTITUENT statements as written

NiW-08Pop.tdb: BCC_A2, type code %B, sha256 e3c06f0d3fa4f8bf…

33: PHASE BCC_A2 %B 2 1 3 !
34: CONST BCC_A2 : NI W% : VA : !

NiW-17Iso.tdb: BCC_A2, type code %B, sha256 feb57ad6eaab269b…

40: PHASE BCC_A2 %B 2 1 3 !
41: CONST BCC_A2 : NI W% : VA : !

NiW-86Fer-LB.tdb: BCC_A2, type code %B, sha256 55903dd3fecb1bf8…

40: PHASE BCC_A2 %B 2 1 3 !
41: CONST BCC_A2 : NI W% : VA : !

Example references (5 of 5; assessments first):

doi:10.1007/BF02817278 A. Fernandez Guillermet, L. Ostlund, Metall. Trans. A, 17A, 1809-23(1986).
assessment that models this phase; reports values for this phase
doi:10.1016/j.intermet.2008.04.003 J. Popovič, P. Brož, J. Buršík, Microstructure and phase equilibria in the Ni–Al–W system, Intermetallics 16, 884-888 (2008).
assessment that models this phase
doi:10.3139/146.111557 I. Isomaki, M. Hamalainien, M.H. Braga, M. Gasik, Int. J. Mater. Res., 108, 1025-35(2017).
assessment that models this phase
doi:10.1007/bf02644589 J. M. Walsh, M. J. Donachie, On a new intermetallic phase in the nickel-tungsten system, Metall Trans 4, 2854-2855 (1973).
cited as the source of values for this phase
doi:10.1016/0036-9748(74)90349-4 K.E Poulsen, S Rubæk, E.W Langer, A new intermetallic phase in the W-Ni system, Scripta Metallurgica 8, 1297-1300 (1974).
cited as the source of values for this phase

NI4X_D1A (Ni–W)

Id: phase:ni-w:d1a-ni4x; status assigned
Structure: MoNi4 · D1_a · tI10 · I4/m (87); type st:d1-a-moni4-ti10; 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: DFT agrees: on-hull mp-aaaabtpb and oqmd-17851, space group 87
Caveat: not certain from the name or DFT alone (unrecognised_name_tokens:NI4X); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Ni 0.8000, W 0.2000
Stability: stable in 3 of 3 calculated diagram(s): 304.84–1290 K, x(W) 0.2–0.2
Literature: 15 values (15 accepted) from 1 papers
Interactive: phase registry entry

Names (8): corpus: corpus:phase:ni-w:d1a-ni4x, corpus:phase:ni-w:ni4x-d1a
mp: mp:mp-aaaabtpb
oqmd: oqmd:oqmd-17851
paper: paper:10.1007/bf02817278:Ni4W
tdb: tdb:NiW-08Pop.tdb:NI4X_D1A, tdb:NiW-17Iso.tdb:NI4X_D1A, tdb:NiW-86Fer-LB.tdb:NI4X_D1A

TDB models of NI4X_D1A (3): PHASE and CONSTITUENT statements as written

NiW-08Pop.tdb: NI4X_D1A, type code %, sha256 e3c06f0d3fa4f8bf…

43: PHASE NI4X_D1A % 2 4 1 !
44: CONST NI4X_D1A : NI : W : !

NiW-17Iso.tdb: NI4X_D1A, type code %, sha256 feb57ad6eaab269b…

58: PHASE NI4X_D1A % 2 4 1 !
59: CONST NI4X_D1A : NI : W : !

NiW-86Fer-LB.tdb: NI4X_D1A, type code %, sha256 55903dd3fecb1bf8…

50: PHASE NI4X_D1A % 2 4 1 !
51: CONST NI4X_D1A : NI : W : !

Example references (4 of 4; assessments first):

doi:10.1007/BF02817278 A. Fernandez Guillermet, L. Ostlund, Metall. Trans. A, 17A, 1809-23(1986).
assessment that models this phase; reports values for this phase
doi:10.1016/j.intermet.2008.04.003 J. Popovič, P. Brož, J. Buršík, Microstructure and phase equilibria in the Ni–Al–W system, Intermetallics 16, 884-888 (2008).
assessment that models this phase
doi:10.3139/146.111557 I. Isomaki, M. Hamalainien, M.H. Braga, M. Gasik, Int. J. Mater. Res., 108, 1025-35(2017).
assessment that models this phase
doi:10.1016/0036-9748(74)90349-4 K.E Poulsen, S Rubæk, E.W Langer, A new intermetallic phase in the W-Ni system, Scripta Metallurgica 8, 1297-1300 (1974).
cited as the source of values for this phase

FCC_A1 (Ni–W)

Id: phase:ni-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 3 of 3 calculated diagram(s): 300–1790.73 K, x(W) 0–0.17637
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:ni-w:fcc-a1
paper: paper:10.1007/bf02817278:fcc
tdb: tdb:NiW-08Pop.tdb:FCC_A1, tdb:NiW-17Iso.tdb:FCC_A1, tdb:NiW-86Fer-LB.tdb:FCC_A1

TDB models of FCC_A1 (3): PHASE and CONSTITUENT statements as written

NiW-08Pop.tdb: FCC_A1, type code %A, sha256 e3c06f0d3fa4f8bf…

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

NiW-17Iso.tdb: FCC_A1, type code %A, sha256 feb57ad6eaab269b…

35: PHASE FCC_A1 %A 2 1 1 !
36: CONST FCC_A1 : NI% W : VA : !

NiW-86Fer-LB.tdb: FCC_A1, type code %A, sha256 55903dd3fecb1bf8…

35: PHASE FCC_A1 %A 2 1 1 !
36: CONST FCC_A1 : NI% W : VA : !

Example references (5 of 5; assessments first):

doi:10.1007/BF02817278 A. Fernandez Guillermet, L. Ostlund, Metall. Trans. A, 17A, 1809-23(1986).
assessment that models this phase; reports values for this phase
doi:10.1016/j.intermet.2008.04.003 J. Popovič, P. Brož, J. Buršík, Microstructure and phase equilibria in the Ni–Al–W system, Intermetallics 16, 884-888 (2008).
assessment that models this phase
doi:10.3139/146.111557 I. Isomaki, M. Hamalainien, M.H. Braga, M. Gasik, Int. J. Mater. Res., 108, 1025-35(2017).
assessment that models this phase
doi:10.1007/bf02644589 J. M. Walsh, M. J. Donachie, On a new intermetallic phase in the nickel-tungsten system, Metall Trans 4, 2854-2855 (1973).
cited as the source of values for this phase
doi:10.1016/0036-9748(74)90349-4 K.E Poulsen, S Rubæk, E.W Langer, A new intermetallic phase in the W-Ni system, Scripta Metallurgica 8, 1297-1300 (1974).
cited as the source of values for this phase

HCP_A3 (Ni–W)

Id: phase:ni-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 3 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:ni-w:hcp-a3
tdb: tdb:NiW-08Pop.tdb:HCP_A3, tdb:NiW-17Iso.tdb:HCP_A3, tdb:NiW-86Fer-LB.tdb:HCP_A3

TDB models of HCP_A3 (3): PHASE and CONSTITUENT statements as written

NiW-08Pop.tdb: HCP_A3, type code %A, sha256 e3c06f0d3fa4f8bf…

38: PHASE HCP_A3 %A 2 1 0.5 !
39: CONST HCP_A3 : NI W : VA : !

NiW-17Iso.tdb: HCP_A3, type code %A, sha256 feb57ad6eaab269b…

45: PHASE HCP_A3 %A 2 1 0.5 !
46: CONST HCP_A3 : NI W : VA : !

NiW-86Fer-LB.tdb: HCP_A3, type code %A, sha256 55903dd3fecb1bf8…

45: PHASE HCP_A3 %A 2 1 0.5 !
46: CONST HCP_A3 : NI W : VA : !

Example references (3 of 3; assessments first):

doi:10.1007/BF02817278 A. Fernandez Guillermet, L. Ostlund, Metall. Trans. A, 17A, 1809-23(1986).
assessment that models this phase
doi:10.1016/j.intermet.2008.04.003 J. Popovič, P. Brož, J. Buršík, Microstructure and phase equilibria in the Ni–Al–W system, Intermetallics 16, 884-888 (2008).
assessment that models this phase
doi:10.3139/146.111557 I. Isomaki, M. Hamalainien, M.H. Braga, M. Gasik, Int. J. Mater. Res., 108, 1025-35(2017).
assessment that models this phase

LIQUID (Ni–W)

Id: phase:ni-w:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 3 of 3 calculated diagram(s): 1728.25–4000 K, x(W) 0–1
Literature: 1 values (0 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:ni-w:liquid
paper: paper:10.1007/bf02817278:liquid
tdb: tdb:NiW-08Pop.tdb:LIQUID, tdb:NiW-17Iso.tdb:LIQUID, tdb:NiW-86Fer-LB.tdb:LIQUID

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

NiW-08Pop.tdb: LIQUID, type code %, sha256 e3c06f0d3fa4f8bf…

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

NiW-17Iso.tdb: LIQUID, type code %, sha256 feb57ad6eaab269b…

30: PHASE LIQUID:L % 1 1 !
31: CONST LIQUID:L : NI W : !

NiW-86Fer-LB.tdb: LIQUID, type code %, sha256 55903dd3fecb1bf8…

30: PHASE LIQUID:L % 1 1 !
31: CONST LIQUID:L : NI W : !

Example references (3 of 3; assessments first):

doi:10.1007/BF02817278 A. Fernandez Guillermet, L. Ostlund, Metall. Trans. A, 17A, 1809-23(1986).
assessment that models this phase; reports values for this phase
doi:10.1016/j.intermet.2008.04.003 J. Popovič, P. Brož, J. Buršík, Microstructure and phase equilibria in the Ni–Al–W system, Intermetallics 16, 884-888 (2008).
assessment that models this phase
doi:10.3139/146.111557 I. Isomaki, M. Hamalainien, M.H. Braga, M. Gasik, Int. J. Mater. Res., 108, 1025-35(2017).
assessment that models this phase

NI3W_D0A (Ni–W)

Id: phase:ni-w:ni3w-d0a; status assigned
Structure: beta-Cu3Ti · D0_a · oP8 · Pmmn (59); type st:d0-a-beta-cu3ti-op8; tier A: standard phase name; confidence high
Stoichiometry: Ni 0.7500, W 0.2500
Stability: stable in 1 of 1 calculated diagram(s): 300–848.8 K, x(W) 0.25–0.25
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ni-w:ni3w-d0a
tdb: tdb:NiW-17Iso.tdb:NI3W_D0A

TDB models of NI3W_D0A (1): PHASE and CONSTITUENT statements as written

NiW-17Iso.tdb: NI3W_D0A, type code %, sha256 feb57ad6eaab269b…

63: PHASE NI3W_D0A % 2 3 1 !
64: CONST NI3W_D0A : NI : W : !

Example references (1 of 1; assessments first):

doi:10.3139/146.111557 I. Isomaki, M. Hamalainien, M.H. Braga, M. Gasik, Int. J. Mater. Res., 108, 1025-35(2017).
assessment that models this phase

NI8W (Ni–W)

Id: phase:ni-w:ni8w; status needs_review
No structure assigned. Why: no_structure_token; off_stoichiometric_model
Candidate (tdb_comment): Pt8Ti · tI18 · I4/mmm — NiW-17Iso.tdb: 'Prototype Pt8Ti (tI18, I4/mmm)'
Stability: stable in 1 of 1 calculated diagram(s): 300–802.5 K, x(W) 0.11111–0.11111
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ni-w:ni8w
tdb: tdb:NiW-17Iso.tdb:NI8W

TDB models of NI8W (1): PHASE and CONSTITUENT statements as written

NiW-17Iso.tdb: NI8W, type code %A, sha256 feb57ad6eaab269b…

53: PHASE NI8W %A 2 1 0.125 !
54: CONST NI8W : NI : VA W% : !

Example references (1 of 1; assessments first):

doi:10.3139/146.111557 I. Isomaki, M. Hamalainien, M.H. Braga, M. Gasik, Int. J. Mater. Res., 108, 1025-35(2017).
assessment that models this phase

NIW (Ni–W)

Id: phase:ni-w:niw; status assigned
Structure: MoNi · oP56 · P2_12_12_1 (19); type st:moni-op56; 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: Ni 0.5000, W 0.5000
Stability: stable in 2 of 2 calculated diagram(s): 300–1340.8 K, x(W) 0.5–0.5
Literature: 10 values (10 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:ni-w:niw
paper: paper:10.1007/bf02817278:NiW
tdb: tdb:NiW-08Pop.tdb:NIW, tdb:NiW-86Fer-LB.tdb:NIW

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

NiW-08Pop.tdb: NIW, type code %, sha256 e3c06f0d3fa4f8bf…

48: PHASE NIW % 2 1 1 !
49: CONST NIW : NI : W : !

NiW-86Fer-LB.tdb: NIW, type code %, sha256 55903dd3fecb1bf8…

55: PHASE NIW % 2 1 1 !
56: CONST NIW : NI : W : !

Example references (4 of 4; assessments first):

doi:10.1007/BF02817278 A. Fernandez Guillermet, L. Ostlund, Metall. Trans. A, 17A, 1809-23(1986).
assessment that models this phase; reports values for this phase
doi:10.1016/j.intermet.2008.04.003 J. Popovič, P. Brož, J. Buršík, Microstructure and phase equilibria in the Ni–Al–W system, Intermetallics 16, 884-888 (2008).
assessment that models this phase
doi:10.1016/0036-9748(74)90349-4 K.E Poulsen, S Rubæk, E.W Langer, A new intermetallic phase in the W-Ni system, Scripta Metallurgica 8, 1297-1300 (1974).
cited as the source of values for this phase
doi:10.1007/bf02644589 J. M. Walsh, M. J. Donachie, On a new intermetallic phase in the nickel-tungsten system, Metall Trans 4, 2854-2855 (1973).
cited as the source of values for this phase

NIW2 (Ni–W)

Id: phase:ni-w:niw2; status needs_review
No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
Candidate (literature_printed): (NiW2) · tI96 — printed with a label mapped to this phase
Candidate (sgte_mmc2): (NiW2) · tI96 — Hallstedt 2025 mmc2 row for NIW2: NiW2
Stoichiometry: Ni 0.3333, W 0.6667
Stability: stable in 2 of 2 calculated diagram(s): 300–1340 K, x(W) 0.66667–0.66667
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:ni-w:niw2
paper: paper:10.1007/bf02817278:NiW2
tdb: tdb:NiW-08Pop.tdb:NIW2, tdb:NiW-86Fer-LB.tdb:NIW2

TDB models of NIW2 (2): PHASE and CONSTITUENT statements as written

NiW-08Pop.tdb: NIW2, type code %, sha256 e3c06f0d3fa4f8bf…

53: PHASE NIW2 % 2 1 2 !
54: CONST NIW2 : NI : W : !

NiW-86Fer-LB.tdb: NIW2, type code %, sha256 55903dd3fecb1bf8…

60: PHASE NIW2 % 2 1 2 !
61: CONST NIW2 : NI : W : !

Example references (3 of 3; assessments first):

doi:10.1007/BF02817278 A. Fernandez Guillermet, L. Ostlund, Metall. Trans. A, 17A, 1809-23(1986).
assessment that models this phase; reports values for this phase
doi:10.1016/j.intermet.2008.04.003 J. Popovič, P. Brož, J. Buršík, Microstructure and phase equilibria in the Ni–Al–W system, Intermetallics 16, 884-888 (2008).
assessment that models this phase
doi:10.1016/0036-9748(74)90349-4 K.E Poulsen, S Rubæk, E.W Langer, A new intermetallic phase in the W-Ni system, Scripta Metallurgica 8, 1297-1300 (1974).
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}
}