Al–B system

36 accepted literature values from 3 paper(s) (experimental 7, model 29); 5 calculated phase diagram(s). 12 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 (9) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	7
model	29

Accepted values by property group
Property group	Values
invariant reaction	24
formation	10
other property	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.

Assessments with a calculated phase diagram
TDB file	Assessment	SHA-256	Links
AlB-01Luk-LB.tdb	H.L. Lukas, unpublished, 2001.	`642c909d17cc2a6bd403bc755976f6d6215565678cdf48ebb4782d6feeb71436`	viewer · TDB · JSON
AlB-04Mir.tdb	D. Mirkovic, J. Grobner, R. Schmid-Fetzer, O. Fabrichnaya, H.L. Lukas, J. Alloys Compd., 384, 168-74(2004). doi:10.1016/j.jallcom.2004.04.100	`47801a2129a7f1f254ec0643ae185581121ece7d640b9ed1a23d7ea8d2e46348`	viewer · TDB · JSON
AlB-15Wan.tdb	W. Wang, Z. Fu, T. Liu, W. Zhang, Calphad, 51, 24-34(2015). doi:10.1016/j.calphad.2015.07.001	`45a52a0572a39025f4b50dd3b6a3d6716533cd41e7220e2f72e077b344a54358`	viewer · TDB · JSON
AlB-98Luk.tdb	H.L. Lukas, COST 507, Final report round 2, 1998.	`564969ba25933e9fde6808575bb17062351414b3df6eaaa9ae70485bd4f278af`	viewer · TDB · JSON
AlB-99Cam.tdb	C.E. Campbell, U.R. Kattner, J. Phase Equilib., 20, 485-96(1999). doi:10.1361/105497199770340743	`4d78ca2cbf5a40960c80f7c5f391436a9dcb84eb31043f50d80d526478484e73`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
AlB-01Luk-LB.tdb	2320.34	ALB12_ALPHA (x(B) 0.92308) + LIQUID (x(B) 0.97485) + BETA_RHOMBO_B (x(B) 1)
AlB-01Luk-LB.tdb	2320.34	ALB12_ALPHA (x(B) 0.92308) + LIQUID (x(B) 0.97514) + BETA_RHOMBO_B (x(B) 1)
AlB-01Luk-LB.tdb	2320.33	ALB12_ALPHA (x(B) 0.92308) + LIQUID (x(B) 0.97502) + BETA_RHOMBO_B (x(B) 1)
AlB-01Luk-LB.tdb	1303.12	LIQUID (x(B) 0.01724) + ALB2_C32 (x(B) 0.66667) + ALB12_ALPHA (x(B) 0.92308)
AlB-01Luk-LB.tdb	1303.12	LIQUID (x(B) 0.01726) + ALB2_C32 (x(B) 0.66667) + ALB12_ALPHA (x(B) 0.92308)
AlB-01Luk-LB.tdb	934.81	LIQUID (x(B) 6.200e-4) + FCC_A1 (x(B) 0.00258) + ALB2_C32 (x(B) 0.66667)
AlB-04Mir.tdb	2320.34	ALB12_ALPHA (x(B) 0.92308) + LIQUID (x(B) 0.97485) + BETA_RHOMBO_B (x(B) 1)
AlB-04Mir.tdb	2320.34	ALB12_ALPHA (x(B) 0.92308) + LIQUID (x(B) 0.97504) + BETA_RHOMBO_B (x(B) 1)
AlB-04Mir.tdb	2320.33	ALB12_ALPHA (x(B) 0.92308) + LIQUID (x(B) 0.97502) + BETA_RHOMBO_B (x(B) 1)
AlB-04Mir.tdb	1245.74	LIQUID (x(B) 0.012) + ALB2_C32 (x(B) 0.66667) + ALB12_ALPHA (x(B) 0.92308)
AlB-04Mir.tdb	933	FCC_A1 (x(B) 5.000e-5) + LIQUID (x(B) 7.600e-4) + ALB2_C32 (x(B) 0.66667)
AlB-04Mir.tdb	486.65	FCC_A1 (x(B) 0) + ALB2_C32 (x(B) 0.66667) + ALB12_ALPHA (x(B) 0.92308)
AlB-15Wan.tdb	2319.88	ALB12_ALPHA (x(B) 0.92308) + LIQUID (x(B) 0.97451) + BETA_RHOMBO_B (x(B) 1)
AlB-15Wan.tdb	2319.88	ALB12_ALPHA (x(B) 0.92308) + LIQUID (x(B) 0.97467) + BETA_RHOMBO_B (x(B) 1)
AlB-15Wan.tdb	2319.88	ALB12_ALPHA (x(B) 0.92308) + LIQUID (x(B) 0.9747) + BETA_RHOMBO_B (x(B) 1)
AlB-15Wan.tdb	1244.98	LIQUID (x(B) 0.01293) + ALB2_C32 (x(B) 0.66667) + ALB12_ALPHA (x(B) 0.92308)
AlB-15Wan.tdb	1244.98	LIQUID (x(B) 0.01292) + ALB2_C32 (x(B) 0.66667) + ALB12_ALPHA (x(B) 0.92308)
AlB-15Wan.tdb	932.97	FCC_A1 (x(B) 1.200e-4) + LIQUID (x(B) 8.600e-4) + ALB2_C32 (x(B) 0.66667)
AlB-15Wan.tdb	486.87	FCC_A1 (x(B) 0) + ALB2_C32 (x(B) 0.66667) + ALB12_ALPHA (x(B) 0.92308)
AlB-98Luk.tdb	2335.95	ALB12_BETA (x(B) 0.92308) + LIQUID (x(B) 0.98811) + BETA_RHOMBO_B (x(B) 1)
AlB-98Luk.tdb	2335.95	ALB12_BETA (x(B) 0.92308) + LIQUID (x(B) 0.98816) + BETA_RHOMBO_B (x(B) 1)
AlB-98Luk.tdb	1826.25	ALB12_BETA (x(B) 0.92308) + ALB12_ALPHA (x(B) 0.92308) + BETA_RHOMBO_B (x(B) 1)
AlB-98Luk.tdb	1826.25	LIQUID (x(B) 0.48243) + ALB12_ALPHA (x(B) 0.92308) + ALB12_BETA (x(B) 0.92308)
AlB-98Luk.tdb	1245.85	LIQUID (x(B) 0.01861) + ALB2_C32 (x(B) 0.66667) + ALB12_ALPHA (x(B) 0.92308)
AlB-98Luk.tdb	1245.85	LIQUID (x(B) 0.01863) + ALB2_C32 (x(B) 0.66667) + ALB12_ALPHA (x(B) 0.92308)
AlB-98Luk.tdb	935.04	LIQUID (x(B) 7.300e-4) + FCC_A1 (x(B) 0.0031) + ALB2_C32 (x(B) 0.66667)
AlB-98Luk.tdb	935.04	LIQUID (x(B) 7.200e-4) + FCC_A1 (x(B) 0.00304) + ALB2_C32 (x(B) 0.66667)
AlB-99Cam.tdb	2251.23	LIQUID (x(B) 0.89811) + ALB12_ALPHA (x(B) 0.92308) + BETA_RHOMBO_B (x(B) 0.97485)
AlB-99Cam.tdb	2251.23	LIQUID (x(B) 0.89834) + ALB12_ALPHA (x(B) 0.92308) + BETA_RHOMBO_B (x(B) 0.97492)
AlB-99Cam.tdb	1302.28	LIQUID (x(B) 0.02519) + ALB2_C32 (x(B) 0.66667) + ALB12_ALPHA (x(B) 0.92308)
AlB-99Cam.tdb	1302.28	LIQUID (x(B) 0.02519) + ALB2_C32 (x(B) 0.66667) + ALB12_ALPHA (x(B) 0.92308)
AlB-99Cam.tdb	1302.28	LIQUID (x(B) 0.0252) + ALB2_C32 (x(B) 0.66667) + ALB12_ALPHA (x(B) 0.92308)
AlB-99Cam.tdb	1302.28	LIQUID (x(B) 0.02523) + ALB2_C32 (x(B) 0.66667) + ALB12_ALPHA (x(B) 0.92308)
AlB-99Cam.tdb	932.64	FCC_A1 (x(B) 4.000e-5) + LIQUID (x(B) 0.00129) + ALB2_C32 (x(B) 0.66667)
AlB-99Cam.tdb	932.64	FCC_A1 (x(B) 4.000e-5) + LIQUID (x(B) 0.00129) + ALB2_C32 (x(B) 0.66667)
AlB-99Cam.tdb	775.32	FCC_A1 (x(B) 0) + AL2B3 (x(B) 0.6) + ALB2_C32 (x(B) 0.66667)
AlB-99Cam.tdb	764.56	AL2B3 (x(B) 0.6) + ALB2_C32 (x(B) 0.66667) + ALB12_ALPHA (x(B) 0.92308)

Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull AlB-01Luk-LB · CALPHAD hull AlB-04Mir · CALPHAD hull AlB-98Luk · CALPHAD hull AlB-99Cam

Invariant reactions (literature)

Invariant reactions reported in the literature for the Al–B system (24)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location	Quote
2448	congruent melting: AlB12-H -> Liquid		model	[1] (ed.) 1998	Table I, p. 33, row 5 report
2367.15	congruent melting: Liquid -> AlB12	Liquid: B 0.923; AlB12: B 0.923	model	[2] Mirković 2004	Table 3, p. 5, row 1 report
2336	eutectic: Liquid -> AlB12-H + β-rhombo-B		model	[1] (ed.) 1998	Table I, p. 33, row 4 report
2323.15	peritectic: AlB12 ↔ β + L	AlB12: B 0.923; β: B 0.97	experimental	[3] Campbell 1999 cites Duschanek 1995 doi	Table 3, p. 3, row 12 report
2320.15	eutectic: Liquid -> AlB12 + β-B	Liquid: B 0.975; AlB12: B 0.923; β-B: B 1	model	[2] Mirković 2004	Table 3, p. 5, row 2 report
2251.15	peritectic: AlB12 ↔ β + L	AlB12: B 0.923; β: B 0.975; L: B 0.898	model	[3] Campbell 1999	Table 3, p. 3, row 13 report
1826.2	polymorphic: AlB12-L -> AlB12-H	AlB12-L: Al 0.076923, B 0.923077; AlB12-H: Al 0.076923, B 0.923077	model	[1] (ed.) 1998	Table I, p. 33, row 3 report
1303.15	peritectic: AlB2 ↔ AlB12 + L	AlB2: B 0.667; AlB12: B 0.923; L: B 0.006	experimental	[3] Campbell 1999 cites Sigworth 1984 doi	Table 3, p. 3, row 9 report
1302.15	peritectic: AlB2 ↔ AlB12 + L	AlB2: B 0.667; AlB12: B 0.923; L: B 0.025	model	[3] Campbell 1999	Table 3, p. 3, row 11 report
1251.15	peritectic: AlB2 ↔ AlB12 + L	AlB2: B 0.667; AlB12: B 0.923; L: B 0.02	model	[3] Campbell 1999 cites Batzner 1994	Table 3, p. 3, row 10 report
1245.8	peritectic: Liquid + AlB12-L -> AlB2	AlB12-L: Al 0.076923, B 0.923077; AlB2: Al 0.333333, B 0.666667	model	[1] (ed.) 1998	Table I, p. 33, row 2 report
1245.15	peritectic: Liquid + AlB12 -> AlB2	Liquid: B 0.012; AlB12: B 0.923; AlB2: B 0.667	model	[2] Mirković 2004	Table 3, p. 5, row 3 report
935	peritectic: Liquid + AlB2 -> fcc-Al	AlB2: Al 0.333333, B 0.666667	model	[1] (ed.) 1998	Table I, p. 33, row 1 report
933.602	congruent melting: L ↔ Al	L: B 0; Al: B 0	experimental	[3] Campbell 1999 cites Carlson 1990 doi	Table 3, p. 3, row 1 report
933.47	congruent melting: L ↔ Al	L: B 0; Al: B 0	model	[3] Campbell 1999 cites Dinsdale 1991 doi	Table 3, p. 3, row 2 report
933.25	eutectic: Al + AlB2 ↔ L	Al: B 6.300e-4; AlB2: B 0.667; L: B 3.500e-4	model	[3] Campbell 1999 cites Batzner 1994	Table 3, p. 3, row 7 report
932.99	eutectic: Liquid -> AlB2 + fcc	Liquid: B 7.600e-4; AlB2: B 0.667; fcc: B 5.400e-5	model	[2] Mirković 2004	Table 3, p. 5, row 4 report
932.99	eutectic: L ↔ (Al) + AlB2		model	[2] Mirković 2004	p. 6 report	The Al-rich eutectic reaction L ↔ (Al) + AlB2 is calculated at 659.84 ◦ C with 0.076 at.% B in Liquid and 0.005 at.% B in (Al).
932.93	eutectic: L ↔ (Al) + AlB12		model	[2] Mirković 2004	p. 6 report	The metastable eutectic reaction L ↔ (Al) + AlB12 is calculated 0.06 K lower, at 659.78 ◦ C with similar compositions.
932.85	eutectic: Al + AlB2 ↔ L	Al: B 4.500e-5; AlB2: B 0.667; L: B 5.500e-4	experimental	[3] Campbell 1999 cites Sigworth 1984 doi	Table 3, p. 3, row 6 report
932.63	eutectic: Al + AlB2 ↔ L	Al: B 4.400e-5; AlB2: B 0.667; L: B 0.0013	model	[3] Campbell 1999	Table 3, p. 3, row 8 report
798.15	peritectoid: Al + AlB2 ↔ Al2B3	Al: B 4.000e-5; AlB2: B 0.667; Al2B3: B 0.6	experimental	[3] Campbell 1999 cites Vardiman 1992 doi	Table 3, p. 3, row 3 report
798.15	peritectoid: Al + AlB2 ↔ Al2B3	Al: B 4.300e-5; AlB2: B 0.667; Al2B3: B 0.6	model	[3] Campbell 1999 cites Batzner 1994	Table 3, p. 3, row 4 report
775.45	peritectoid: Al + AlB2 ↔ Al2B3	Al: B 4.700e-5; AlB2: B 0.667; Al2B3: B 0.6	model	[3] Campbell 1999	Table 3, p. 3, row 5 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–B system (10)
Phase	Compound	Value	T (K)	Class	MP DFT (kJ/mol-atom)	OQMD DFT (kJ/mol-atom)	Source	Location
AlB12	AlB12	-27.8 kJ/mol-atom	298.15	model		16.476 (oqmd-1437941)	[3] Campbell 1999	Table 7, p. 7, row 5 report
AlB12	AlB12	-20.469 kJ/mol-atom	298.15	model		16.476 (oqmd-1437941)	[3] Campbell 1999 cites Barin 1989	Table 7, p. 7, row 3 report
AlB12	AlB12	-15.45 kJ/mol-atom ± 3.2	298.15	experimental		16.476 (oqmd-1437941)	[3] Campbell 1999 cites Domalski 1967 doi	Table 7, p. 7, row 1 report
AlB12	AlB12	-15.253 kJ/mol-atom	298.15	model		16.476 (oqmd-1437941)	[3] Campbell 1999 cites Fries doi	Table 7, p. 7, row 2 report
AlB12	AlB12	-7.13 kJ/mol-atom	298.15	model		16.476 (oqmd-1437941)	[3] Campbell 1999 cites Batzner 1994	Table 7, p. 7, row 4 report
AlB2	AlB2	-50.332 kJ/mol-atom	298.15	model	-4.148 (mp-aaaaabki)	-4.243 (oqmd-103360)	[3] Campbell 1999 cites Barin 1989	Table 7, p. 7, row 3 report
AlB2	AlB2	-28.603 kJ/mol-atom	298.15	model	-4.148 (mp-aaaaabki)	-4.243 (oqmd-103360)	[3] Campbell 1999 cites Fries doi	Table 7, p. 7, row 2 report
AlB2	AlB2	-22.3 kJ/mol-atom ± 4.2	298.15	experimental	-4.148 (mp-aaaaabki)	-4.243 (oqmd-103360)	[3] Campbell 1999 cites Domalski 1967 doi	Table 7, p. 7, row 1 report
AlB2	AlB2	-21.8 kJ/mol-atom	298.15	model	-4.148 (mp-aaaaabki)	-4.243 (oqmd-103360)	[3] Campbell 1999 cites Batzner 1994	Table 7, p. 7, row 4 report
AlB2	AlB2	-19.1 kJ/mol-atom	298.15	model	-4.148 (mp-aaaaabki)	-4.243 (oqmd-103360)	[3] Campbell 1999	Table 7, p. 7, row 5 report

Other properties

Other property (2)

Other property, Al–B system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Other printed: enthalpy of the peritectic reaction	-2.55 kJ/mol atoms	1245.15		model	[2] Mirković 2004	p. 5 report	The calculated enthalpy of the peritectic reaction at 972 ◦ C is -2.55 kJ/mol atoms, corresponding to the reaction given in Eq. (1).
Other printed: enthalpy of melting	41.2 kJ/mol atoms	1779.15		model	[2] Mirković 2004	p. 6 report	At the metastable congruent melting point of AlB2 at 1506 ◦ C, the enthalpy of melting is even 41.2 kJ/mol atoms.

Sources

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

I. Ansara, A. T. Dinsdale, M. H. Rand (eds.), COST 507: Thermochemical database for light metal alloys, Volume 2, EUR 18499 EN, Office for Official Publications of the European Communities, Luxembourg (1998), ISBN 92-828-3902-8.
Djordje Mirković, Joachim Gröbner, Rainer Schmid-Fetzer, Olga Fabrichnaya, Hans Leo Lukas, Experimental study and thermodynamic re-assessment of the Al–B system, Journal of Alloys and Compounds 384, 168-174 (2004). doi:10.1016/j.jallcom.2004.04.100
C. E. Campbell, U. R. Kattner, A thermodynamic assessment of the Ni-Al-B system, JPE 20, 485-496 (1999). doi:10.1361/105497199770340743

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}
}