Al–U system

57 accepted literature values from 3 paper(s) (experimental 15, model 17, DFT 25); 3 calculated phase diagram(s).

Data: JSON · CSV · interactive explorer · interactive phase diagram · phases (10) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	15
model	17
DFT	25

Accepted values by property group
Property group	Values
invariant reaction	20
formation	5
heat capacity / entropy / enthalpy	11
crystal structure	21

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
AlU-08Wan.tdb	J. Wang, X.J. Liu, C.P. Wang, J. Nucl. Mater., 374, 79-86(2008). doi:10.1016/j.jnucmat.2007.06.023	`c873310a9de11c896661cae78b9edf85d8cf05572f27b1e1755845df52d02b19`	viewer · TDB · JSON
AlU-10Sed.tdb	D. Sedmidubsky, R.J.M. Konings, P. Soucek, J. Nucl. Mater., 397, 1-7(2010). doi:10.1016/j.jnucmat.2009.11.023	`064d1a3f1f9b0fa854e84e76825929d3856a08b96c0f7b136bb6ef1f7e165190`	viewer · TDB · JSON
AlU-10Zha.tdb	X. Zhang, Y.F. Cui, G.L. Xu, W.J. Zhu, H.S. Liu, B.Y. Yin, Z.P. Jin, J. Nucl. Mater., 402, 15-24(2010). doi:10.1016/j.jnucmat.2010.04.018	`2ca2fd5f09bedc79b6e3665dbbdc0f84424e506f3ec039d8c617206a18c3de73`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
AlU-08Wan.tdb	1623.85	LIQUID (x(U) 0.1586) + AL3U_L12 (x(U) 0.25) + AL2U_C15 (x(U) 0.33333)
AlU-08Wan.tdb	1623.85	LIQUID (x(U) 0.15854) + AL3U_L12 (x(U) 0.25) + AL2U_C15 (x(U) 0.33333)
AlU-08Wan.tdb	1623.85	LIQUID (x(U) 0.15868) + AL3U_L12 (x(U) 0.25) + AL2U_C15 (x(U) 0.33333)
AlU-08Wan.tdb	1377.57	AL2U_C15 (x(U) 0.33333) + LIQUID (x(U) 0.92813) + BCC_A2 (x(U) 0.9511)
AlU-08Wan.tdb	1029.45	AL2U_C15 (x(U) 0.33333) + BCC_A2 (x(U) 0.98591) + TETRAGONAL_U (x(U) 0.996)
AlU-08Wan.tdb	1003.91	LIQUID (x(U) 0.02959) + AL4U_BETA (x(U) 0.19197) + AL3U_L12 (x(U) 0.25)
AlU-08Wan.tdb	1003.91	LIQUID (x(U) 0.02959) + AL4U_BETA (x(U) 0.19197) + AL3U_L12 (x(U) 0.25)
AlU-08Wan.tdb	938.89	AL2U_C15 (x(U) 0.33333) + TETRAGONAL_U (x(U) 0.99829) + ORTHORHOMBIC_A20 (x(U) 0.99951)
AlU-08Wan.tdb	938.89	AL2U_C15 (x(U) 0.33333) + TETRAGONAL_U (x(U) 0.99833) + ORTHORHOMBIC_A20 (x(U) 0.99952)
AlU-08Wan.tdb	919.34	AL4U_BETA (x(U) 0.19202) + AL4U_D1B (x(U) 0.19202) + AL3U_L12 (x(U) 0.25)
AlU-08Wan.tdb	919.34	LIQUID (x(U) 0.01908) + AL4U_D1B (x(U) 0.18688) + AL4U_BETA (x(U) 0.18688)
AlU-08Wan.tdb	914.25	FCC_A1 (x(U) 0) + LIQUID (x(U) 0.0185) + AL4U_D1B (x(U) 0.18651)
AlU-10Sed.tdb	1623.75	LIQUID (x(U) 0.15957) + AL3U_L12 (x(U) 0.25) + AL2U_C15 (x(U) 0.33333)
AlU-10Sed.tdb	1397.35	AL2U_C15 (x(U) 0.33333) + LIQUID (x(U) 0.93659) + BCC_A2 (x(U) 0.95962)
AlU-10Sed.tdb	1030.14	AL2U_C15 (x(U) 0.33333) + BCC_A2 (x(U) 0.99011) + TETRAGONAL_U (x(U) 1)
AlU-10Sed.tdb	1009.44	LIQUID (x(U) 0.00391) + AL4U_D1B (x(U) 0.2) + AL3U_L12 (x(U) 0.25)
AlU-10Sed.tdb	942.02	AL2U_C15 (x(U) 0.33333) + ORTHORHOMBIC_A20 (x(U) 1) + TETRAGONAL_U (x(U) 1)
AlU-10Sed.tdb	932.53	FCC_A1 (x(U) 0) + LIQUID (x(U) 0.00138) + AL4U_D1B (x(U) 0.2)
AlU-10Zha.tdb	1623.85	LIQUID (x(U) 0.1586) + AL3U_L12 (x(U) 0.25) + AL2U_C15 (x(U) 0.33333)
AlU-10Zha.tdb	1623.85	LIQUID (x(U) 0.15854) + AL3U_L12 (x(U) 0.25) + AL2U_C15 (x(U) 0.33333)
AlU-10Zha.tdb	1623.85	LIQUID (x(U) 0.15866) + AL3U_L12 (x(U) 0.25) + AL2U_C15 (x(U) 0.33333)
AlU-10Zha.tdb	1377.57	AL2U_C15 (x(U) 0.33333) + LIQUID (x(U) 0.92813) + BCC_A2 (x(U) 0.9511)
AlU-10Zha.tdb	1029.45	AL2U_C15 (x(U) 0.33333) + BCC_A2 (x(U) 0.98591) + TETRAGONAL_U (x(U) 0.996)
AlU-10Zha.tdb	1002.52	LIQUID (x(U) 0.02944) + AL4U_D1B (x(U) 0.2) + AL3U_L12 (x(U) 0.25)
AlU-10Zha.tdb	1002.52	LIQUID (x(U) 0.02946) + AL4U_D1B (x(U) 0.2) + AL3U_L12 (x(U) 0.25)
AlU-10Zha.tdb	1002.52	LIQUID (x(U) 0.02942) + AL4U_D1B (x(U) 0.2) + AL3U_L12 (x(U) 0.25)
AlU-10Zha.tdb	938.89	AL2U_C15 (x(U) 0.33333) + TETRAGONAL_U (x(U) 0.99829) + ORTHORHOMBIC_A20 (x(U) 0.99951)
AlU-10Zha.tdb	938.89	AL2U_C15 (x(U) 0.33333) + TETRAGONAL_U (x(U) 0.99833) + ORTHORHOMBIC_A20 (x(U) 0.99952)
AlU-10Zha.tdb	913.76	FCC_A1 (x(U) 0) + LIQUID (x(U) 0.01896) + AL4U_D1B (x(U) 0.2)
AlU-10Zha.tdb	913.76	FCC_A1 (x(U) 0) + LIQUID (x(U) 0.01885) + AL4U_D1B (x(U) 0.2)
AlU-10Zha.tdb	913.76	FCC_A1 (x(U) 0) + LIQUID (x(U) 0.01883) + AL4U_D1B (x(U) 0.2)

Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull AlU-08Wan · CALPHAD hull AlU-10Zha

Invariant reactions (literature)

Invariant reactions reported in the literature for the Al–U system (20)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location
1893.15	congruent melting: L -> Al2U	Al2U: Al 0.667	model	[1] Wang 2008	Table 2, p. 5, row 20 report
1893.15	congruent melting: L -> Al2U	Al2U: Al 0.667	model	[1] Wang 2008 cites Kassner 1989 doi	Table 2, p. 5, row 19 report
1863.15	congruent melting: L -> Al2U	Al2U: Al 0.667	experimental	[1] Wang 2008 cites Cabane 1955	Table 2, p. 5, row 18 report
1624.15	peritectic: L + Al2U -> Al3U	L: Al 0.845; Al2U: Al 0.667; Al3U: Al 0.75	model	[1] Wang 2008	Table 2, p. 5, row 15 report
1623.15	peritectic: L + Al2U -> Al3U	L: Al 0.832; Al2U: Al 0.667; Al3U: Al 0.75	experimental	[1] Wang 2008 cites Cabane 1955	Table 2, p. 5, row 13 report
1623.15	peritectic: L + Al2U -> Al3U	L: Al 0.87; Al2U: Al 0.667; Al3U: Al 0.75	model	[1] Wang 2008 cites Kassner 1989 doi	Table 2, p. 5, row 14 report
1378.15	eutectic: L -> γ (U) + Al2U	L: Al 0.0713; γ (U): Al 0.0488; Al2U: Al 0.667	model	[1] Wang 2008	Table 2, p. 5, row 5 report
1378.15	eutectic: L -> γ (U) + Al2U	γ (U): Al 0.047; Al2U: Al 0.667	experimental	[1] Wang 2008 cites Straatman 1964	Table 2, p. 5, row 3 report
1378.15	eutectic: L -> γ (U) + Al2U	L: Al 0.06; γ (U): Al 0.047; Al2U: Al 0.667	model	[1] Wang 2008 cites Kassner 1989 doi	Table 2, p. 5, row 4 report
1033.15	eutectoid: γ (U) -> β (U) + Al2U	γ (U): Al 0.014; β (U): Al 0.0054; Al2U: Al 0.667	experimental	[1] Wang 2008 cites Straatman 1964	Table 2, p. 5, row 7 report
1031.15	eutectoid: γ (U) -> β (U) + Al2U	Al2U: Al 0.667	model	[1] Wang 2008 cites Kassner 1989 doi	Table 2, p. 5, row 8 report
1029.15	eutectoid: γ (U) -> β (U) + Al2U	γ (U): Al 0.0141; β (U): Al 0.004; Al2U: Al 0.667	model	[1] Wang 2008	Table 2, p. 5, row 9 report
1023.15	eutectoid: γ (U) -> β (U) + Al2U	γ (U): Al 0.014; β (U): Al 0.0054; Al2U: Al 0.667	experimental	[1] Wang 2008 cites Straatman 1964	Table 2, p. 5, row 6 report
1005.15	peritectic: L + Al3U -> Al4U (β)	Al3U: Al 0.75, U 0.25; Al4U (β): Al 0.8, U 0.2	experimental	[1] Wang 2008 cites Cabane 1955	Table 2, p. 5, row 10 report
1004.15	peritectic: L + Al3U -> Al4U (β)	L: Al 0.972; Al3U: Al 0.75; Al4U (β): Al 0.814	model	[1] Wang 2008	Table 2, p. 5, row 12 report
1004.15	peritectic: L + Al3U -> Al4U (β)	L: Al 0.977; Al3U: Al 0.75; Al4U (β): Al 0.818	model	[1] Wang 2008 cites Kassner 1989 doi	Table 2, p. 5, row 11 report
919.15	polymorphic: Al4U (α) -> Al4U (β)	Al4U (α): Al 0.8; Al4U (β): Al 0.828	model	[1] Wang 2008 cites Kassner 1989 doi	Table 2, p. 5, row 16 report
919.15	polymorphic: Al4U (α) -> Al4U (β)	Al4U (α): Al 0.809; Al4U (β): Al 0.824	model	[1] Wang 2008	Table 2, p. 5, row 17 report
914.15	eutectic: L -> fcc (Al) + Al4U (α)	L: Al 0.982; fcc (Al): Al 1; Al4U (α): Al 0.824	model	[1] Wang 2008	Table 2, p. 5, row 2 report
914.15	eutectic: L -> fcc (Al) + Al4U (α)	L: Al 0.983; fcc (Al): Al 0.99993; Al4U (α): Al 0.828	model	[1] Wang 2008 cites Kassner 1989 doi	Table 2, p. 5, row 1 report

Formation enthalpies

Literature values in kJ/mol-atom where the per-atom basis is known. DFT columns: the lowest-energy entry at the same composition (Materials Project 2026.04.13, OQMD v1.8; different energy references, never averaged), from dft_parity.json.

Enthalpies of formation, Al–U system (3)
Phase	Value	Class	Source	Location
UAl2	-86.1 kJ/mol (basis unstated)	DFT	[2] Sedmidubský 2010	Table 2, p. 3, row 1 report
UAl3	-87 kJ/mol (basis unstated)	DFT	[2] Sedmidubský 2010	Table 2, p. 3, row 4 report
UAl4	-91.4 kJ/mol (basis unstated)	DFT	[2] Sedmidubský 2010	Table 2, p. 3, row 9 report

Other properties

Formation (2)

Formation, Al–U system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Entropy of formation printed: ΔfS°298	-1.1 J/mol (basis unstated)/K	298.15	UAl2 alloy: U 0.333333	DFT	[2] Sedmidubský 2010	Table 2, p. 3, row 1 report
Entropy of formation printed: ΔfS°298	-13.1 J/mol (basis unstated)/K	298.15	UAl3 alloy: U 0.25	DFT	[2] Sedmidubský 2010	Table 2, p. 3, row 4 report

Heat capacity / entropy / enthalpy (11)

Heat capacity / entropy / enthalpy, Al–U system
Property	Value	T (K)	Phases / composition	Class	Source	Location
heat content contribution printed: H°298 - H°0 (el.)	0.67 kJ mol^-1	298.15	UAl2 alloy: U 0.333333	DFT	[2] Sedmidubský 2010	Table 2, p. 3, row 1 report
heat content contribution printed: H°298 - H°0 (ph.)	24.2 kJ mol^-1	298.15	UAl2 alloy: U 0.333333	DFT	[2] Sedmidubský 2010	Table 2, p. 3, row 1 report
heat content contribution printed: H°298 - H°0 (el.)	0.65 kJ mol^-1	298.15	UAl3 alloy: U 0.25	DFT	[2] Sedmidubský 2010	Table 2, p. 3, row 4 report
heat content contribution printed: H°298 - H°0 (ph.)	32.3 kJ mol^-1	298.15	UAl3 alloy: U 0.25	DFT	[2] Sedmidubský 2010	Table 2, p. 3, row 4 report
heat content contribution printed: H°298 − H°0 (el.)	1 kJ mol−1	298.15	UAl4 alloy: U 0.2	DFT	[2] Sedmidubský 2010	Table 2, p. 3, row 9 report
heat content contribution printed: H°298 - H°0 (el.)	1 kJ mol^-1	298.15	UAl4 alloy: U 0.2	DFT	[2] Sedmidubský 2010	Table 2, p. 3, row 9 report
sm contribution printed: S°298 (ph.)	101.2 J/mol (basis unstated)/K	298.15	UAl2 alloy: U 0.333333	DFT	[2] Sedmidubský 2010	Table 2, p. 3, row 1 report
sm contribution printed: S°298 (el.)	4.5 J/mol (basis unstated)/K	298.15	UAl2 alloy: U 0.333333	DFT	[2] Sedmidubský 2010	Table 2, p. 3, row 1 report
sm contribution printed: S°298 (ph.)	117.5 J/mol (basis unstated)/K	298.15	UAl3 alloy: U 0.25	DFT	[2] Sedmidubský 2010	Table 2, p. 3, row 4 report
sm contribution printed: S°298 (el.)	4.4 J/mol (basis unstated)/K	298.15	UAl3 alloy: U 0.25	DFT	[2] Sedmidubský 2010	Table 2, p. 3, row 4 report
sm contribution printed: S°298 (el.)	5.7 J/mol (basis unstated)/K	298.15	UAl4 alloy: U 0.2	DFT	[2] Sedmidubský 2010	Table 2, p. 3, row 9 report

Crystal structure (21)

Crystal structure, Al–U system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Lattice a	7.776 Å		UAl2 alloy: U 0.333333	experimental	[3] Moussa 2018 cites Steeb 1961 doi	Table 1, p. 3, row 6 report
Lattice a	4.266 Å		UAl3 alloy: U 0.25	experimental	[3] Moussa 2018 cites Rundle 1949 doi	Table 1, p. 3, row 7 report
Lattice a	4.401 Å		UAl4 alloy: U 0.2	experimental	[3] Moussa 2018 cites Tougait 2004 doi	Table 1, p. 3, row 8 report
Lattice a	2.854 Å		αU αU: Al 0.001	model	[3] Moussa 2018 cites Kassner 1989 doi	Table 1, p. 3, row 1 report
Lattice a	7.76 Å	298.15	UAl2 alloy: U 0.333333	DFT	[2] Sedmidubský 2010 cites Katz 1962 doi	Table 1, p. 2, row 1 report
Lattice a	4.253 Å	298.15	UAl3 alloy: U 0.25	DFT	[2] Sedmidubský 2010 cites Petzow 1968 doi	Table 1, p. 2, row 4 report
Lattice a	4.401 Å	298.15	UAl4 alloy: U 0.2	DFT	[2] Sedmidubský 2010 cites Zenou 2001 doi	Table 1, p. 2, row 8 report
Lattice b	7.776 Å		UAl2 alloy: U 0.333333	experimental	[3] Moussa 2018 cites Steeb 1961 doi	Table 1, p. 3, row 6 report
Lattice b	4.266 Å		UAl3 alloy: U 0.25	experimental	[3] Moussa 2018 cites Rundle 1949 doi	Table 1, p. 3, row 7 report
Lattice b	6.255 Å		UAl4 alloy: U 0.2	experimental	[3] Moussa 2018 cites Tougait 2004 doi	Table 1, p. 3, row 8 report
Lattice b	5.867 Å		αU αU: Al 0.001	model	[3] Moussa 2018 cites Kassner 1989 doi	Table 1, p. 3, row 1 report
Lattice b	7.76 Å	298.15	UAl2 alloy: U 0.333333	DFT	[2] Sedmidubský 2010 cites Katz 1962 doi	Table 1, p. 2, row 1 report
Lattice b	4.253 Å	298.15	UAl3 alloy: U 0.25	DFT	[2] Sedmidubský 2010 cites Petzow 1968 doi	Table 1, p. 2, row 4 report
Lattice b	6.246 Å	298.15	UAl4 alloy: U 0.2	DFT	[2] Sedmidubský 2010 cites Zenou 2001 doi	Table 1, p. 2, row 8 report
Lattice c	7.776 Å		UAl2 alloy: U 0.333333	experimental	[3] Moussa 2018 cites Steeb 1961 doi	Table 1, p. 3, row 6 report
Lattice c	4.266 Å		UAl3 alloy: U 0.25	experimental	[3] Moussa 2018 cites Rundle 1949 doi	Table 1, p. 3, row 7 report
Lattice c	13.727 Å		UAl4 alloy: U 0.2	experimental	[3] Moussa 2018 cites Tougait 2004 doi	Table 1, p. 3, row 8 report
Lattice c	4.954 Å		αU αU: Al 0.001	model	[3] Moussa 2018 cites Kassner 1989 doi	Table 1, p. 3, row 1 report
Lattice c	7.76 Å	298.15	UAl2 alloy: U 0.333333	DFT	[2] Sedmidubský 2010 cites Katz 1962 doi	Table 1, p. 2, row 1 report
Lattice c	4.253 Å	298.15	UAl3 alloy: U 0.25	DFT	[2] Sedmidubský 2010 cites Petzow 1968 doi	Table 1, p. 2, row 4 report
Lattice c	13.72 Å	298.15	UAl4 alloy: U 0.2	DFT	[2] Sedmidubský 2010 cites Zenou 2001 doi	Table 1, p. 2, row 8 report

Sources

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

J. Wang, X.J. Liu, C.P. Wang, Thermodynamic modeling of the Al–U and Co–U systems, Journal of Nuclear Materials 374, 79-86 (2008). doi:10.1016/j.jnucmat.2007.06.023
D. Sedmidubský, R.J.M. Konings, P. Souček, Ab-initio calculations and phase diagram assessments of An–Al systems (An= U, Np, Pu), Journal of Nuclear Materials 397, 1-7 (2010). doi:10.1016/j.jnucmat.2009.11.023
Chantal Moussa, Alexandre Berche, José Barbosa, Mathieu Pasturel, Bertrand Stepnik, Olivier Tougait, Experimental investigation of the phase equilibria and thermodynamic assessment in the U-Ga and U-Al-Ga systems, Journal of Nuclear Materials 499, 361-371 (2018). doi:10.1016/j.jnucmat.2017.11.037

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}
}