Hf–Ti system

13 accepted literature values from 2 paper(s) (experimental 8, model 5); 1 calculated phase diagram(s). 13 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: JSON · CSV · interactive explorer · interactive phase diagram · phases (4) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	8
model	5

Accepted values by property group
Property group	Values
phase transition	13

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.

Assessments with a calculated phase diagram
TDB file	Assessment	SHA-256	Links
HfTi-97Bit-LB.tdb	H. Bittermann, P. Rogl, J. Phase Equilib., 18, 24-47(1997). doi:10.1007/BF02646757	`44d765c37f4e4954719cb74a40d7305866fc0d9b90a31f520fe33e13be804b2b`	viewer · TDB · JSON

Convex hulls: Materials Project DFT hull · OQMD DFT hull

Other properties

Phase transition (13)

Phase transition, Hf–Ti system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Phase transition	500.15 K	500.15	critical point: hcp - (Hf, Ti) hcp-(Hf, Ti): Ti 0.5	model	[1] Cacciamani 2011	Table 6, p. 7, row 3 report
Phase transition	1043 K	1043	congruent transformation: (αTi,αHf)/(βTi,βHf)	experimental	[2] Bittermann 1997 cites ref. 59Tyl	Table 5, p. 6, row 2 report
Phase transition	1063 K	1063	congruent transformation: (αTi,αHf)/(βTi,βHf)	experimental	[2] Bittermann 1997 cites Chang 1966	Table 5, p. 6, row 3 report
Phase transition	1063 K	1063	congruent transformation: (αTi,αHf)/(βTi,βHf)	experimental	[2] Bittermann 1997 cites Hayes 1957	Table 5, p. 6, row 1 report
Phase transition	1063 K	1063	congruent transformation: (αTi,αHf)/(βTi,βHf)	model	[2] Bittermann 1997	Table 5, p. 6, row 5 report
Phase transition	1063.15 K	1063.15	congruent transformation: bcc-(Hf, Ti) -> hcp-(Hf, Ti) bcc-(Hf, Ti): Ti 0.78; hcp-(Hf, Ti): Ti 0.78	model	[1] Cacciamani 2011	Table 6, p. 7, row 2 report
Phase transition	1068 K	1068	congruent transformation: (αTi,αHf)/(βTi,βHf)	experimental	[2] Bittermann 1997 cites Ruda 1975	Table 5, p. 6, row 4 report
Phase transition	1873 K	1873	congruent transformation: (βTi,βHf)/L	experimental	[2] Bittermann 1997 cites ref. 59Tyl	Table 5, p. 6, row 7 report
Phase transition	1913 K	1913	congruent transformation: (βTi,βHf)/L	experimental	[2] Bittermann 1997 cites Chang 1966	Table 5, p. 6, row 8 report
Phase transition	1913 K	1913	congruent transformation: (βTi,βHf)/L	experimental	[2] Bittermann 1997 cites Hayes 1957	Table 5, p. 6, row 6 report
Phase transition	1926 K	1926	congruent transformation: (βTi,βHf)/L	model	[2] Bittermann 1997	Table 5, p. 6, row 10 report
Phase transition	1926.15 K	1926.15	congruent melting: L -> bcc-(Hf, Ti) L: Ti 0.88; bcc-(Hf, Ti): Ti 0.88	model	[1] Cacciamani 2011	Table 6, p. 7, row 1 report
Phase transition	1929 K	1929	congruent transformation: (βTi,βHf)/L	experimental	[2] Bittermann 1997 cites Rudy 1969	Table 5, p. 6, row 9 report

Sources

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

G. Cacciamani, P. Riani, F. Valenza, Equilibrium between MB2 (M=Ti,Zr,Hf) UHTC and Ni: A thermodynamic database for the B–Hf–Ni–Ti–Zr system, Calphad 35, 601-619 (2011). doi:10.1016/j.calphad.2011.10.003
H. Bittermann, P. Rogl, Critical assessment and thermodynamic calculation of the ternary system boron-hafnium-titanium (B-Hf-Ti), JPE 18, 24-47 (1997). doi:10.1007/bf02646757

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

@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}
}