# Cr–Ru system

> Cr–Ru system: 24 accepted literature values (invariant reaction 24) and 2 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

HTML: https://data.orchid-project.org/systems/CR-RU.html · Markdown: https://data.orchid-project.org/systems/CR-RU.md

24 accepted literature values from 2 paper(s) (model 5, unspecified 19); 2 calculated phase diagram(s). 1 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/CR-RU.json) · [CSV](https://data.orchid-project.org/systems/CR-RU.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#CR-RU) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#CR-RU/CrRu-05Che-LB.json) · [phases (7)](https://data.orchid-project.org/phases/pages/CR-RU.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/CR-RU.html) · [Markdown](https://data.orchid-project.org/systems/CR-RU.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| model | 5 |
| unspecified | 19 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 24 |

## 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 |
|---|---|---|---|
| CrRu-05Che-LB.tdb | P.-Y. Chevalier, E. Fischer, unpublished, 2005. | `6aaa1a7c6fe998e3f66e3fe50107e56633b727fd7d211de15ca0327413ee50a1` | [viewer](https://orchid-project.org/phase-diagrams/#CR-RU/CrRu-05Che-LB.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CrRu-05Che-LB.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CrRu-05Che-LB.json) |
| CrRu-15Zhu.tdb | L.L. Zhu, H.Y. Qi, L. Jiang, Z.P. Jin, J.-C. Zhao, Intermetallics, 64, 86-95(2015). [doi:10.1016/j.intermet.2015.04.011](https://doi.org/10.1016/j.intermet.2015.04.011) | `8548a182cf1b5ea420247891b86db51d681d793861804b9b5d49aceb05e1daa6` | [viewer](https://orchid-project.org/phase-diagrams/#CR-RU/CrRu-15Zhu.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CrRu-15Zhu.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CrRu-15Zhu.json) |

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

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| CrRu-05Che-LB.tdb | 1880.45 | BCC_A2 (x(Ru) 0.32063) + LIQUID (x(Ru) 0.3734) + HCP_A3 (x(Ru) 0.51637) |
| CrRu-05Che-LB.tdb | 1841.2 | BCC_A2 (x(Ru) 0.31506) + CR2RU_D8B (x(Ru) 0.33333) + HCP_A3 (x(Ru) 0.51503) |
| CrRu-05Che-LB.tdb | 1841.2 | BCC_A2 (x(Ru) 0.31509) + CR2RU_D8B (x(Ru) 0.33333) + HCP_A3 (x(Ru) 0.51504) |
| CrRu-05Che-LB.tdb | 1227.83 | BCC_A2 (x(Ru) 0.21498) + CR3RU_A15 (x(Ru) 0.25) + CR2RU_D8B (x(Ru) 0.33333) |
| CrRu-05Che-LB.tdb | 1227.83 | BCC_A2 (x(Ru) 0.21496) + CR3RU_A15 (x(Ru) 0.25) + CR2RU_D8B (x(Ru) 0.33333) |
| CrRu-05Che-LB.tdb | 1227.83 | BCC_A2 (x(Ru) 0.21497) + CR3RU_A15 (x(Ru) 0.25) + CR2RU_D8B (x(Ru) 0.33333) |
| CrRu-05Che-LB.tdb | 1106.06 | CR3RU_A15 (x(Ru) 0.25) + CR2RU_D8B (x(Ru) 0.33333) + HCP_A3 (x(Ru) 0.5094) |
| CrRu-05Che-LB.tdb | 1054.88 | BCC_A2 (x(Ru) 0.1906) + CR3RU_A15 (x(Ru) 0.25) + HCP_A3 (x(Ru) 0.51009) |
| CrRu-15Zhu.tdb | 1888.32 | BCC_A2 (x(Ru) 0.31759) + LIQUID (x(Ru) 0.36836) + HCP_A3 (x(Ru) 0.46554) |
| CrRu-15Zhu.tdb | 1852.76 | BCC_A2 (x(Ru) 0.31336) + SIGMA_D8B (x(Ru) 0.34198) + HCP_A3 (x(Ru) 0.47013) |
| CrRu-15Zhu.tdb | 1272.95 | BCC_A2 (x(Ru) 0.22275) + CR3RU_A15 (x(Ru) 0.315) + SIGMA_D8B (x(Ru) 0.31976) |
| CrRu-15Zhu.tdb | 1272.95 | BCC_A2 (x(Ru) 0.22273) + CR3RU_A15 (x(Ru) 0.315) + SIGMA_D8B (x(Ru) 0.31976) |
| CrRu-15Zhu.tdb | 1072.87 | CR3RU_A15 (x(Ru) 0.315) + SIGMA_D8B (x(Ru) 0.34118) + HCP_A3 (x(Ru) 0.59439) |
| CrRu-15Zhu.tdb | 1072.87 | CR3RU_A15 (x(Ru) 0.315) + SIGMA_D8B (x(Ru) 0.34117) + HCP_A3 (x(Ru) 0.59441) |
| CrRu-15Zhu.tdb | 1022.26 | BCC_A2 (x(Ru) 0.19204) + CR3RU_A15 (x(Ru) 0.315) + HCP_A3 (x(Ru) 0.60074) |
| CrRu-15Zhu.tdb | 1022.26 | BCC_A2 (x(Ru) 0.19203) + CR3RU_A15 (x(Ru) 0.315) + HCP_A3 (x(Ru) 0.60075) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/CR/CR-RU.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/CR/CR-RU.json) · [CALPHAD hull CrRu-05Che-LB](https://data.orchid-project.org/hulls/calphad-sgte/CR/CR-RU--CrRu-05Che-LB.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Cr–Ru system (24)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1888 | eutectic: L ↔ bcc(Cr) + hcp (Ru) | L: Ru 0.368; bcc(Cr): Ru 0.317; hcp (Ru): Ru 0.466 | model | [1] Zhu 2015 | Table 2, p. 3, row 4; `ORC-RTHHUGGRTT` |  |
| 1884 | eutectic: L ↔ bcc(Cr) + hcp (Ru) | L: Ru 0.367; bcc(Cr): Ru 0.315; hcp (Ru): Ru 0.471 | unspecified | [1] Zhu 2015; _cites Zhu 2008_ | Table 2, p. 3, row 3; `ORC-I56XVECUUP` |  |
| 1883 | eutectic: L ↔ bcc(Cr) + hcp (Ru) | L: Ru 0.37; bcc(Cr): Ru 0.32; hcp (Ru): Ru 0.48 | unspecified | [1] Zhu 2015; _cites Venkatraman 1987_ [doi](https://doi.org/10.1007/bf02873189) | Table 2, p. 3, row 1; `ORC-LVBKCVWR6O` |  |
| 1881 | eutectic: L ↔ bcc(Cr) + hcp (Ru) | L: Ru 0.373; bcc(Cr): Ru 0.321; hcp (Ru): Ru 0.516 | unspecified | [1] Zhu 2015; _cites Chevalier 2007_ | Table 2, p. 3, row 2; `ORC-HC3ED423NI` |  |
| 1858 | peritectoid: bcc (Cr) + hcp (Ru) ↔ σ | bcc (Cr): Ru 0.312; hcp (Ru): Ru 0.471; σ: Ru 0.347 | unspecified | [1] Zhu 2015; _cites Zhu 2008_ | Table 2, p. 3, row 6; `ORC-VJ7VWXVIYI` |  |
| 1853.15 | peritectoid: (Cr) + (Ru) -> Cr2Ru | (Cr): Ru 0.32; (Ru): Ru 0.48; Cr2Ru: Ru 0.33 | unspecified | [2] WATSON 2006; _cites ref. 3_ | Table 1, p. 3, row 13; `ORC-OJFB6EKF6N` |  |
| 1853 | peritectoid: bcc (Cr) + hcp (Ru) ↔ σ | bcc (Cr): Ru 0.313; hcp (Ru): Ru 0.47; σ: Ru 0.342 | model | [1] Zhu 2015 | Table 2, p. 3, row 7; `ORC-BQ3PVFM2GZ` |  |
| 1853 | peritectoid: bcc (Cr) + hcp (Ru) ↔ σ | bcc (Cr): Ru 0.32; hcp (Ru): Ru 0.48; σ: Ru 0.33 | unspecified | [1] Zhu 2015; _cites Venkatraman 1987_ [doi](https://doi.org/10.1007/bf02873189) | Table 2, p. 3, row 5; `ORC-VUNMIFSEET` |  |
| 1851.15 | peritectoid: (Cr) + (Ru) -> Cr2Ru | (Cr): Ru 0.324; (Ru): Ru 0.484; Cr2Ru: Ru 0.333 | unspecified | [2] WATSON 2006 | Table 1, p. 3, row 14; `ORC-IG6WCIDDVS` |  |
| 1273.15 | peritectoid: (Cr) + Cr2Ru -> Cr3Ru | (Cr): Ru 0.23; Cr2Ru: Ru 0.33; Cr3Ru: Ru 0.32 | unspecified | [2] WATSON 2006; _cites ref. 3_ | Table 1, p. 3, row 15; `ORC-G5XILJWBS7` |  |
| 1273 | peritectoid: bcc (Cr) + σ ↔ Cr3Ru | bcc (Cr): Ru 0.223; σ: Ru 0.32; Cr3Ru: Ru 0.315 | model | [1] Zhu 2015 | Table 2, p. 3, row 10; `ORC-7EVXCSPX4Z` |  |
| 1273 | peritectoid: bcc (Cr) + σ ↔ Cr3Ru | bcc (Cr): Ru 0.23; σ: Ru 0.32; Cr3Ru: Ru 0.315 | unspecified | [1] Zhu 2015; _cites Venkatraman 1987_ [doi](https://doi.org/10.1007/bf02873189) | Table 2, p. 3, row 8; `ORC-STRNDOA73I` |  |
| 1268 | peritectoid: bcc (Cr) + σ ↔ Cr3Ru | bcc (Cr): Ru 0.226; σ: Ru 0.329; Cr3Ru: Ru 0.315 | unspecified | [1] Zhu 2015; _cites Zhu 2008_ | Table 2, p. 3, row 9; `ORC-NV6SBDYNBQ` |  |
| 1259.05 | peritectoid: (Cr) + Cr2Ru -> Cr3Ru | (Cr): Ru 0.221; Cr2Ru: Ru 0.333; Cr3Ru: Ru 0.26 | unspecified | [2] WATSON 2006 | Table 1, p. 3, row 16; `ORC-FYUVQELA3D` |  |
| 1100 | eutectic: σ ↔ Cr3Ru + hcp (Ru) | σ: Ru 0.335; Cr3Ru: Ru 0.315; hcp (Ru): Ru 0.508 | unspecified | [1] Zhu 2015; _cites Zhu 2008_ | Table 2, p. 3, row 12; `ORC-MSB6PQVOWM` |  |
| 1076.85 | eutectoid: Cr2Ru -> Cr3Ru + (Ru) | Cr2Ru: Ru 0.333; Cr3Ru: Ru 0.257; (Ru): Ru 0.506 | unspecified | [2] WATSON 2006 | Table 1, p. 3, row 18; `ORC-HRJHX64HF7` |  |
| 1073.15 | eutectoid: Cr2Ru -> Cr3Ru + (Ru) | Cr2Ru: Ru 0.33; Cr3Ru: Ru 0.32; (Ru): Ru 0.5 | unspecified | [2] WATSON 2006; _cites ref. 3_ | Table 1, p. 3, row 17; `ORC-EEE66N2R7M` |  |
| 1073 | eutectic: σ ↔ Cr3Ru + hcp (Ru) | σ: Ru 0.341; Cr3Ru: Ru 0.315; hcp (Ru): Ru 0.594 | model | [1] Zhu 2015 | Table 2, p. 3, row 13; `ORC-26UCRKYQVK` |  |
| 1073 | eutectic: σ ↔ Cr3Ru + hcp (Ru) | σ: Ru 0.33; Cr3Ru: Ru 0.315; hcp (Ru): Ru 0.5 | unspecified | [1] Zhu 2015; _cites Venkatraman 1987_ [doi](https://doi.org/10.1007/bf02873189) | Table 2, p. 3, row 11; `ORC-3RGB3MFBP7` |  |
| 1053 | eutectic: Cr3Ru ↔ bcc (Cr) + hcp (Ru) | Cr3Ru: Ru 0.315; bcc (Cr): Ru 0.202; hcp (Ru): Ru 0.512 | unspecified | [1] Zhu 2015; _cites Zhu 2008_ | Table 2, p. 3, row 15; `ORC-JR3H7NEYCH` |  |
| 1024.15 | eutectoid: Cr3Ru -> (Cr) + (Ru) | Cr3Ru: Ru 0.256; (Cr): Ru 0.19; (Ru): Ru 0.512 | unspecified | [2] WATSON 2006 | Table 1, p. 3, row 20; `ORC-366NDK4UPF` |  |
| 1023.15 | eutectoid: Cr3Ru -> (Cr) + (Ru) | Cr3Ru: Ru 0.32; (Cr): Ru 0.18; (Ru): Ru 0.51 | unspecified | [2] WATSON 2006; _cites ref. 3_ | Table 1, p. 3, row 19; `ORC-B23RS42KCB` |  |
| 1023 | eutectic: Cr3Ru ↔ bcc (Cr) + hcp (Ru) | Cr3Ru: Ru 0.315; bcc (Cr): Ru 0.18; hcp (Ru): Ru 0.51 | unspecified | [1] Zhu 2015; _cites Venkatraman 1987_ [doi](https://doi.org/10.1007/bf02873189) | Table 2, p. 3, row 14; `ORC-YWPDSTIVRY` |  |
| 1022 | eutectic: Cr3Ru ↔ bcc (Cr) + hcp (Ru) | Cr3Ru: Ru 0.315; bcc (Cr): Ru 0.192; hcp (Ru): Ru 0.601 | model | [1] Zhu 2015 | Table 2, p. 3, row 16; `ORC-GGANRZQVQ7` |  |

## Sources

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

1. L.L. Zhu, H.Y. Qi, L. Jiang, Z.P. Jin, J.-C. Zhao, Experimental determination of the Ni–Cr–Ru phase diagram and thermodynamic reassessments of the Cr–Ru and Ni–Cr–Ru systems, Intermetallics 64, 86-95 (2015). [doi:10.1016/j.intermet.2015.04.011](https://doi.org/10.1016/j.intermet.2015.04.011)
2. A WATSON, L CORNISH, R SUSS, Development of a database for the prediction of phases in Pt-based Superalloys: Cr-Pt-Ru, Rare Metals 25, 597-607 (2006). [doi:10.1016/s1001-0521(06)60106-x](https://doi.org/10.1016/s1001-0521%2806%2960106-x)

## 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/).