Fe–W phases

6 phases (tier A 5, liquid 1); 5 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–W system page · Markdown · field reference

Phases of the Fe–W system (6)
Phase	Structure	Basis	Stability (calculated)	TDB models
BCC_A2 phase:fe-w:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–3999.9 K, x(W) 0–1	3
C14_LAVES phase:fe-w:c14-laves	MgZn2 · C14 · hP12 · P6_3/mmc (194)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–1335.45 K, x(W) 0.32844–0.33333	3
MU_D85 phase:fe-w:d85-mu	Fe7W6 · D8_5 · hR13 · R-3m (166)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–1914.37 K, x(W) 0.39185–0.46154	3
FCC_A1 phase:fe-w:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 873.57–1832.32 K, x(W) 0–0.01357	3
HCP_A3 phase:fe-w:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 3 calculated diagram(s)	3
LIQUID phase:fe-w:liquid	liquid	liquid	stable in 3 of 3 calculated diagram(s): 1805.91–4000 K, x(W) 0–1	3

BCC_A2 (Fe–W)

Id: phase:fe-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): 300–3999.9 K, x(W) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:fe-w:bcc-a2
tdb: tdb:FeW-15Jac-phonon.tdb:BCC_A2, tdb:FeW-15Jac-static.tdb:BCC_A2, tdb:FeW-87Gus-LB.tdb:BCC_A2

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

FeW-15Jac-phonon.tdb: BCC_A2, type code %B, sha256 3c044c4de34afca7…

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

FeW-15Jac-static.tdb: BCC_A2, type code %B, sha256 40556b11f6faf2f1…

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

FeW-87Gus-LB.tdb: BCC_A2, type code %B, sha256 0f42cbd0e7a82e6e…

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

Example references (2 of 2; assessments first):

doi:10.1007/BF02825699 P. Gustafson, Metall. Trans. A, 18A, 175-88 (1987).
assessment that models this phase
doi:10.1016/j.calphad.2015.04.010 A. Jacob, C. Schmetterer, L. Singheiser, A. Gray-Weale, B. Hallstedt, A. Watson, Calphad, 50, 92-104(2015).
assessment that models this phase

C14_LAVES (Fe–W)

Id: phase:fe-w:c14-laves; status assigned
Structure: MgZn2 · C14 · hP12 · P6_3/mmc (194); type st:c14-mgzn2-hp12; tier A: standard phase name; confidence high
Caveat: partitioned order/disorder model in FeW-15Jac-phonon.tdb also describes the disordered state
Caveat: partitioned order/disorder model in FeW-15Jac-static.tdb also describes the disordered state
Caveat: partitioned order/disorder model in FeW-87Gus-LB.tdb also describes the disordered state
Stability: stable in 3 of 3 calculated diagram(s): 300–1335.45 K, x(W) 0.32844–0.33333
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:fe-w:c14-laves
tdb: tdb:FeW-15Jac-phonon.tdb:C14_LAVES, tdb:FeW-15Jac-static.tdb:C14_LAVES, tdb:FeW-87Gus-LB.tdb:C14_LAVES

TDB models of C14_LAVES (3): PHASE and CONSTITUENT statements as written

FeW-15Jac-phonon.tdb: C14_LAVES, type code %, sha256 3c044c4de34afca7…

41: PHASE C14_LAVES % 2 2 1 !
42: CONST C14_LAVES : FE W : FE W : !

FeW-15Jac-static.tdb: C14_LAVES, type code %, sha256 40556b11f6faf2f1…

41: PHASE C14_LAVES % 2 2 1 !
42: CONST C14_LAVES : FE W : FE W : !

FeW-87Gus-LB.tdb: C14_LAVES, type code %, sha256 0f42cbd0e7a82e6e…

45: PHASE C14_LAVES % 2 2 1 !
46: CONST C14_LAVES : FE% W : FE W% : !

Example references (2 of 2; assessments first):

doi:10.1007/BF02825699 P. Gustafson, Metall. Trans. A, 18A, 175-88 (1987).
assessment that models this phase
doi:10.1016/j.calphad.2015.04.010 A. Jacob, C. Schmetterer, L. Singheiser, A. Gray-Weale, B. Hallstedt, A. Watson, Calphad, 50, 92-104(2015).
assessment that models this phase

MU_D85 (Fe–W)

Id: phase:fe-w:d85-mu; status assigned
Structure: Fe7W6 · D8_5 · hR13 · R-3m (166); type st:d8-5-fe7w6-hr13; tier A: standard phase name; confidence high
Caveat: partitioned order/disorder model in FeW-15Jac-phonon.tdb also describes the disordered state
Caveat: partitioned order/disorder model in FeW-15Jac-static.tdb also describes the disordered state
Stability: stable in 3 of 3 calculated diagram(s): 300–1914.37 K, x(W) 0.39185–0.46154
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:fe-w:d85-mu
tdb: tdb:FeW-15Jac-phonon.tdb:MU_D85, tdb:FeW-15Jac-static.tdb:MU_D85, tdb:FeW-87Gus-LB.tdb:MU_D85

TDB models of MU_D85 (3): PHASE and CONSTITUENT statements as written

FeW-15Jac-phonon.tdb: MU_D85, type code %, sha256 3c044c4de34afca7…

46: PHASE MU_D85 % 4 1 4 2 6 !
47: CONST MU_D85 : FE W : W : FE W : FE W : !

FeW-15Jac-static.tdb: MU_D85, type code %, sha256 40556b11f6faf2f1…

46: PHASE MU_D85 % 4 1 4 2 6 !
47: CONST MU_D85 : FE W : W : FE W : FE W : !

FeW-87Gus-LB.tdb: MU_D85, type code %, sha256 0f42cbd0e7a82e6e…

50: PHASE MU_D85 % 3 7 2 4 !
51: CONST MU_D85 : FE : W : FE W% : !

Example references (2 of 2; assessments first):

doi:10.1007/BF02825699 P. Gustafson, Metall. Trans. A, 18A, 175-88 (1987).
assessment that models this phase
doi:10.1016/j.calphad.2015.04.010 A. Jacob, C. Schmetterer, L. Singheiser, A. Gray-Weale, B. Hallstedt, A. Watson, Calphad, 50, 92-104(2015).
assessment that models this phase

FCC_A1 (Fe–W)

Id: phase:fe-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): 873.57–1832.32 K, x(W) 0–0.01357
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:fe-w:fcc-a1
tdb: tdb:FeW-15Jac-phonon.tdb:FCC_A1, tdb:FeW-15Jac-static.tdb:FCC_A1, tdb:FeW-87Gus-LB.tdb:FCC_A1

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

FeW-15Jac-phonon.tdb: FCC_A1, type code %A, sha256 3c044c4de34afca7…

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

FeW-15Jac-static.tdb: FCC_A1, type code %A, sha256 40556b11f6faf2f1…

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

FeW-87Gus-LB.tdb: FCC_A1, type code %A, sha256 0f42cbd0e7a82e6e…

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

Example references (2 of 2; assessments first):

doi:10.1007/BF02825699 P. Gustafson, Metall. Trans. A, 18A, 175-88 (1987).
assessment that models this phase
doi:10.1016/j.calphad.2015.04.010 A. Jacob, C. Schmetterer, L. Singheiser, A. Gray-Weale, B. Hallstedt, A. Watson, Calphad, 50, 92-104(2015).
assessment that models this phase

HCP_A3 (Fe–W)

Id: phase:fe-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:fe-w:hcp-a3
tdb: tdb:FeW-15Jac-phonon.tdb:HCP_A3, tdb:FeW-15Jac-static.tdb:HCP_A3, tdb:FeW-87Gus-LB.tdb:HCP_A3

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

FeW-15Jac-phonon.tdb: HCP_A3, type code %, sha256 3c044c4de34afca7…

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

FeW-15Jac-static.tdb: HCP_A3, type code %, sha256 40556b11f6faf2f1…

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

FeW-87Gus-LB.tdb: HCP_A3, type code %, sha256 0f42cbd0e7a82e6e…

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

Example references (2 of 2; assessments first):

doi:10.1007/BF02825699 P. Gustafson, Metall. Trans. A, 18A, 175-88 (1987).
assessment that models this phase
doi:10.1016/j.calphad.2015.04.010 A. Jacob, C. Schmetterer, L. Singheiser, A. Gray-Weale, B. Hallstedt, A. Watson, Calphad, 50, 92-104(2015).
assessment that models this phase

LIQUID (Fe–W)

Id: phase:fe-w:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 3 of 3 calculated diagram(s): 1805.91–4000 K, x(W) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:fe-w:liquid
tdb: tdb:FeW-15Jac-phonon.tdb:LIQUID, tdb:FeW-15Jac-static.tdb:LIQUID, tdb:FeW-87Gus-LB.tdb:LIQUID

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

FeW-15Jac-phonon.tdb: LIQUID, type code %, sha256 3c044c4de34afca7…

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

FeW-15Jac-static.tdb: LIQUID, type code %, sha256 40556b11f6faf2f1…

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

FeW-87Gus-LB.tdb: LIQUID, type code %, sha256 0f42cbd0e7a82e6e…

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

Example references (2 of 2; assessments first):

doi:10.1007/BF02825699 P. Gustafson, Metall. Trans. A, 18A, 175-88 (1987).
assessment that models this phase
doi:10.1016/j.calphad.2015.04.010 A. Jacob, C. Schmetterer, L. Singheiser, A. Gray-Weale, B. Hallstedt, A. Watson, Calphad, 50, 92-104(2015).
assessment that models 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}
}