# Fe–W system

> Fe–W system: 4 accepted literature values (crystal structure 2, phase transition 1, invariant reaction 1) and 3 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

HTML: https://data.orchid-project.org/systems/FE-W.html · Markdown: https://data.orchid-project.org/systems/FE-W.md

4 accepted literature values from 2 paper(s) (experimental 2, unspecified 2); 3 calculated phase diagram(s). 4 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: [JSON](https://data.orchid-project.org/literature/systems/FE-W.json) · [CSV](https://data.orchid-project.org/systems/FE-W.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#FE-W) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#FE-W/FeW-15Jac-phonon.json) · [phases (6)](https://data.orchid-project.org/phases/pages/FE-W.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/FE-W.html) · [Markdown](https://data.orchid-project.org/systems/FE-W.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 2 |
| unspecified | 2 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 1 |
| phase transition | 1 |
| crystal structure | 2 |

## 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.

Table: Assessments with a calculated phase diagram

| TDB file | Assessment | SHA-256 | Links |
|---|---|---|---|
| FeW-15Jac-phonon.tdb | A. Jacob, C. Schmetterer, L. Singheiser, A. Gray-Weale, B. Hallstedt, A. Watson, Calphad, 50, 92-104(2015). [doi:10.1016/j.calphad.2015.04.010](https://doi.org/10.1016/j.calphad.2015.04.010) | `3c044c4de34afca7d493b118e17ed918697675af0bcccc6296e09cad248ec9fa` | [viewer](https://orchid-project.org/phase-diagrams/#FE-W/FeW-15Jac-phonon.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/FeW-15Jac-phonon.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/FeW-15Jac-phonon.json) |
| FeW-15Jac-static.tdb | A. Jacob, C. Schmetterer, L. Singheiser, A. Gray-Weale, B. Hallstedt, A. Watson, Calphad, 50, 92-104(2015). [doi:10.1016/j.calphad.2015.04.010](https://doi.org/10.1016/j.calphad.2015.04.010) | `40556b11f6faf2f1031039825b1563e4cd65bbf686489fb783a65f51f891ec92` | [viewer](https://orchid-project.org/phase-diagrams/#FE-W/FeW-15Jac-static.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/FeW-15Jac-static.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/FeW-15Jac-static.json) |
| FeW-87Gus-LB.tdb | P. Gustafson, Metall. Trans. A, 18A, 175-88 (1987). [doi:10.1007/BF02825699](https://doi.org/10.1007/BF02825699) | `0f42cbd0e7a82e6e7f3faf7a4de53382dcfddd5e797891f5ad7784c9c2beae65` | [viewer](https://orchid-project.org/phase-diagrams/#FE-W/FeW-87Gus-LB.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/FeW-87Gus-LB.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/FeW-87Gus-LB.json) |

Table: Calculated three-phase invariants (model, mole fraction of the second component)

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| FeW-15Jac-phonon.tdb | 1910.63 | LIQUID (x(W) 0.16907) + MU_D85 (x(W) 0.40965) + BCC_A2 (x(W) 0.9585) |
| FeW-15Jac-phonon.tdb | 1819.91 | LIQUID (x(W) 0.10845) + BCC_A2 (x(W) 0.14363) + MU_D85 (x(W) 0.40032) |
| FeW-15Jac-phonon.tdb | 1332.91 | BCC_A2 (x(W) 0.03414) + C14_LAVES (x(W) 0.32844) + MU_D85 (x(W) 0.41053) |
| FeW-15Jac-static.tdb | 1910.74 | LIQUID (x(W) 0.16368) + MU_D85 (x(W) 0.42803) + BCC_A2 (x(W) 0.95972) |
| FeW-15Jac-static.tdb | 1821.16 | LIQUID (x(W) 0.11066) + BCC_A2 (x(W) 0.14966) + MU_D85 (x(W) 0.41758) |
| FeW-15Jac-static.tdb | 1332.97 | BCC_A2 (x(W) 0.03293) + C14_LAVES (x(W) 0.32861) + MU_D85 (x(W) 0.4055) |
| FeW-87Gus-LB.tdb | 1914.37 | LIQUID (x(W) 0.15827) + MU_D85 (x(W) 0.40537) + BCC_A2 (x(W) 0.96215) |
| FeW-87Gus-LB.tdb | 1819.89 | LIQUID (x(W) 0.11633) + BCC_A2 (x(W) 0.13831) + MU_D85 (x(W) 0.39476) |
| FeW-87Gus-LB.tdb | 1335.45 | BCC_A2 (x(W) 0.04106) + C14_LAVES (x(W) 0.33333) + MU_D85 (x(W) 0.39425) |
| FeW-87Gus-LB.tdb | 383.76 | BCC_A2 (x(W) 1.000e-5) + C14_LAVES (x(W) 0.33333) + MU_D85 (x(W) 0.4611) |
| FeW-87Gus-LB.tdb | 383.76 | BCC_A2 (x(W) 1.000e-5) + C14_LAVES (x(W) 0.33333) + MU_D85 (x(W) 0.4611) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/FE/FE-W.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/FE/FE-W.json) · [CALPHAD hull FeW-15Jac-static](https://data.orchid-project.org/hulls/calphad-sgte/FE/FE-W--FeW-15Jac-static.json) · [CALPHAD hull FeW-87Gus-LB](https://data.orchid-project.org/hulls/calphad-sgte/FE/FE-W--FeW-87Gus-LB.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Fe–W system (1)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1463 | eutectoid: /~-phase -> Fe-rich bcc + FeW |  | experimental | [1] Gustafson 1987 | p. 1; `ORC-JR4WOMFVCM.4fcc73` | “In a complementary work Hofmann ~~employed DTA analysis on alloys containing the FeW phase and he found that it forms from the/z-phase and W-rich solid solution at 1488 K and that the /~-phase decomposes eutectoidally into an Fe-rich bcc phase and FeW at 1463 K.” |

## Other properties

### Phase transition (1)

Table: Phase transition, Fe–W system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 1488 K | 1488 | other: /z-phase + W-rich solid solution -> FeW | experimental | [1] Gustafson 1987 | p. 1; `ORC-JR4WOMFVCM.30e926` | “In a complementary work Hofmann ~~employed DTA analysis on alloys containing the FeW phase and he found that it forms from the/z-phase and W-rich solid solution at 1488 K and that the /~-phase decomposes eutectoidally into an Fe-rich bcc phase and FeW at 1463 K.” |

### Crystal structure (2)

Table: Crystal structure, Fe–W system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Lattice a | 4.766 Å | 298.15 | μ; _alloy: Fe 0.538462, W 0.461538_ | unspecified | [2] Ostrowska 2020 | Table 3, p. 3, row 1; `ORC-XIGI5PPGSY.411566` |  |
| Lattice c | 25.8731 Å | 298.15 | μ; _alloy: Fe 0.538462, W 0.461538_ | unspecified | [2] Ostrowska 2020 | Table 3, p. 3, row 1; `ORC-XIGI5PPGSY.63ead6` |  |

## Sources

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

1. Per Gustafson, A thermodynamic evaluation of the C−Fe−W system, Metall Trans A 18, 175-188 (1987). [doi:10.1007/bf02825699](https://doi.org/10.1007/bf02825699)
2. Marlena Ostrowska, Gabriele Cacciamani, Thermodynamic modelling of the σ and μ phases in several ternary systems containing Co, Cr, Fe, Mo, Re and W, Journal of Alloys and Compounds 845, 156122 (2020). [doi:10.1016/j.jallcom.2020.156122](https://doi.org/10.1016/j.jallcom.2020.156122)

## 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). https://doi.org/10.5281/zenodo.23735569
- R. Arróyave, J. Saal, D. Shin, ORCHID-Diagrams: calculated binary phase diagrams (version 2026.10), Zenodo (2026). https://doi.org/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). https://doi.org/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). https://doi.org/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.

```bibtex
@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}
}
```

---

Derived data CC BY 4.0 ([licence](https://creativecommons.org/licenses/by/4.0/)): cite ORCHID ([CITATION.cff](https://data.orchid-project.org/CITATION.cff)) and the original sources. Quotes are short excerpts kept so that each value can be checked; they remain under the publishers' copyright and are not relicensed. Source papers, page images and full text are not redistributed. Field reference: [SCHEMA.md](https://data.orchid-project.org/literature/SCHEMA.md). Machine-readable guide: [llms.txt](https://data.orchid-project.org/llms.txt). Found an error? The report link of a value (Markdown: its id, ORC-..., in the Location column) opens a pre-filled GitHub issue, https://github.com/orchid-calphad/orchid-data/issues/new?template=report-value-error.yml&record_id=\<id>, carrying only the record id, source and value; [how to contribute](https://orchid-project.org/contribute/).