# Al–Sc system

> Al–Sc system: 103 accepted literature values (invariant reaction 70, crystal structure 33) and 3 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

HTML: https://data.orchid-project.org/systems/AL-SC.html · Markdown: https://data.orchid-project.org/systems/AL-SC.md

103 accepted literature values from 4 paper(s) (experimental 35, model 40, unspecified 28); 3 calculated phase diagram(s). 20 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/AL-SC.json) · [CSV](https://data.orchid-project.org/systems/AL-SC.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#AL-SC) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#AL-SC/AlSc-10Bo.json) · [phases (8)](https://data.orchid-project.org/phases/pages/AL-SC.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/AL-SC.html) · [Markdown](https://data.orchid-project.org/systems/AL-SC.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 35 |
| model | 40 |
| unspecified | 28 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 70 |
| crystal structure | 33 |

## 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 |
|---|---|---|---|
| AlSc-10Bo.tdb | H. Bo, L.B. Liu, Z.P. Jin, J. Alloys Compd., 490, 318-25(2010). [doi:10.1016/j.jallcom.2009.10.003](https://doi.org/10.1016/j.jallcom.2009.10.003) | `45d2f4a9a159e401b7d33a7f04c803b81317d99ff277797709fefc694ec5704b` | [viewer](https://orchid-project.org/phase-diagrams/#AL-SC/AlSc-10Bo.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/AlSc-10Bo.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/AlSc-10Bo.json) |
| AlSc-98Mur.tdb | J.L. Murray, J. Phase Equilib., 19, 380-84(1998). [doi:10.1361/105497198770342120](https://doi.org/10.1361/105497198770342120) | `c476dee15cbcc54154a2f9748d6b8eece661d00bdde805696a558c6309ee2108` | [viewer](https://orchid-project.org/phase-diagrams/#AL-SC/AlSc-98Mur.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/AlSc-98Mur.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/AlSc-98Mur.json) |
| AlSc-99Cac-LB.tdb | G. Cacciamani, P. Riani, G. Borzone, N. Parodi, A. Saccone, R. Ferro, A. Pisch, R. Schmid-Fetzer, Intermetallics, 7, 101-108(1999). [doi:10.1016/S0966-9795(98)00022-3](https://doi.org/10.1016/S0966-9795%2898%2900022-3) | `3bd2989713373b922f6ed1268770e1e9fc490f4f513250de1e0a5c23cc9c5a3d` | [viewer](https://orchid-project.org/phase-diagrams/#AL-SC/AlSc-99Cac-LB.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/AlSc-99Cac-LB.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/AlSc-99Cac-LB.json) |

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

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| AlSc-10Bo.tdb | 1591.11 | LIQUID (x(Sc) 0.22616) + AL3SC_L12 (x(Sc) 0.25) + AL2SC_C15 (x(Sc) 0.33333) |
| AlSc-10Bo.tdb | 1591.11 | LIQUID (x(Sc) 0.22629) + AL3SC_L12 (x(Sc) 0.25) + AL2SC_C15 (x(Sc) 0.33333) |
| AlSc-10Bo.tdb | 1591.11 | LIQUID (x(Sc) 0.2261) + AL3SC_L12 (x(Sc) 0.25) + AL2SC_C15 (x(Sc) 0.33333) |
| AlSc-10Bo.tdb | 1504.81 | AL2SC_C15 (x(Sc) 0.33333) + LIQUID (x(Sc) 0.47769) + ALSC_B2 (x(Sc) 0.5) |
| AlSc-10Bo.tdb | 1504.81 | AL2SC_C15 (x(Sc) 0.33333) + LIQUID (x(Sc) 0.47757) + ALSC_B2 (x(Sc) 0.5) |
| AlSc-10Bo.tdb | 1472.48 | ALSC_B2 (x(Sc) 0.5) + LIQUID (x(Sc) 0.56482) + ALSC2_B82 (x(Sc) 0.66667) |
| AlSc-10Bo.tdb | 1472.35 | ALSC2_B82 (x(Sc) 0.66667) + LIQUID (x(Sc) 0.77399) + BCC_A2 (x(Sc) 0.84632) |
| AlSc-10Bo.tdb | 1472.35 | ALSC2_B82 (x(Sc) 0.66667) + LIQUID (x(Sc) 0.77404) + BCC_A2 (x(Sc) 0.84637) |
| AlSc-10Bo.tdb | 1242.39 | ALSC2_B82 (x(Sc) 0.66667) + BCC_A2 (x(Sc) 0.88088) + HCP_A3 (x(Sc) 0.89758) |
| AlSc-10Bo.tdb | 1242.39 | ALSC2_B82 (x(Sc) 0.66667) + BCC_A2 (x(Sc) 0.88096) + HCP_A3 (x(Sc) 0.89767) |
| AlSc-10Bo.tdb | 932.79 | FCC_A1 (x(Sc) 0.002) + LIQUID (x(Sc) 0.00303) + AL3SC_L12 (x(Sc) 0.25) |
| AlSc-98Mur.tdb | 1615.51 | LIQUID (x(Sc) 0.91504) + BCC_A2 (x(Sc) 0.95314) + HCP_A3 (x(Sc) 0.96441) |
| AlSc-98Mur.tdb | 1603.68 | LIQUID (x(Sc) 0.24855) + AL3SC_L12 (x(Sc) 0.25) + AL2SC_C15 (x(Sc) 0.33333) |
| AlSc-98Mur.tdb | 1603.68 | LIQUID (x(Sc) 0.24887) + AL3SC_L12 (x(Sc) 0.25) + AL2SC_C15 (x(Sc) 0.33333) |
| AlSc-98Mur.tdb | 1603.68 | LIQUID (x(Sc) 0.24847) + AL3SC_L12 (x(Sc) 0.25) + AL2SC_C15 (x(Sc) 0.33333) |
| AlSc-98Mur.tdb | 1550.82 | AL2SC_C15 (x(Sc) 0.33333) + LIQUID (x(Sc) 0.44694) + ALSC_B2 (x(Sc) 0.5) |
| AlSc-98Mur.tdb | 1550.82 | AL2SC_C15 (x(Sc) 0.33333) + LIQUID (x(Sc) 0.4468) + ALSC_B2 (x(Sc) 0.5) |
| AlSc-98Mur.tdb | 1455.83 | ALSC_B2 (x(Sc) 0.5) + LIQUID (x(Sc) 0.61084) + ALSC2_B82 (x(Sc) 0.66667) |
| AlSc-98Mur.tdb | 1455.83 | ALSC_B2 (x(Sc) 0.5) + LIQUID (x(Sc) 0.61078) + ALSC2_B82 (x(Sc) 0.66667) |
| AlSc-98Mur.tdb | 1178.57 | ALSC2_B82 (x(Sc) 0.66667) + LIQUID (x(Sc) 0.82969) + HCP_A3 (x(Sc) 0.95263) |
| AlSc-98Mur.tdb | 1178.57 | ALSC2_B82 (x(Sc) 0.66667) + LIQUID (x(Sc) 0.82966) + HCP_A3 (x(Sc) 0.95264) |
| AlSc-98Mur.tdb | 932.81 | FCC_A1 (x(Sc) 0.00233) + LIQUID (x(Sc) 0.00335) + AL3SC_L12 (x(Sc) 0.25) |
| AlSc-98Mur.tdb | 932.8 | FCC_A1 (x(Sc) 0.00227) + LIQUID (x(Sc) 0.00325) + AL3SC_L12 (x(Sc) 0.25) |
| AlSc-99Cac-LB.tdb | 1556.09 | LIQUID (x(Sc) 0.20653) + AL3SC_L12 (x(Sc) 0.25) + AL2SC_C15 (x(Sc) 0.33333) |
| AlSc-99Cac-LB.tdb | 1556.09 | LIQUID (x(Sc) 0.20684) + AL3SC_L12 (x(Sc) 0.25) + AL2SC_C15 (x(Sc) 0.33333) |
| AlSc-99Cac-LB.tdb | 1556.09 | LIQUID (x(Sc) 0.20646) + AL3SC_L12 (x(Sc) 0.25) + AL2SC_C15 (x(Sc) 0.33333) |
| AlSc-99Cac-LB.tdb | 1506.79 | AL2SC_C15 (x(Sc) 0.33333) + LIQUID (x(Sc) 0.49101) + ALSC_B2 (x(Sc) 0.5) |
| AlSc-99Cac-LB.tdb | 1506.78 | AL2SC_C15 (x(Sc) 0.33333) + LIQUID (x(Sc) 0.49123) + ALSC_B2 (x(Sc) 0.5) |
| AlSc-99Cac-LB.tdb | 1478.32 | ALSC_B2 (x(Sc) 0.5) + LIQUID (x(Sc) 0.56612) + ALSC2_B82 (x(Sc) 0.66667) |
| AlSc-99Cac-LB.tdb | 1478.32 | ALSC_B2 (x(Sc) 0.5) + LIQUID (x(Sc) 0.56608) + ALSC2_B82 (x(Sc) 0.66667) |
| AlSc-99Cac-LB.tdb | 1460.8 | ALSC2_B82 (x(Sc) 0.66667) + LIQUID (x(Sc) 0.77463) + BCC_A2 (x(Sc) 0.79816) |
| AlSc-99Cac-LB.tdb | 1460.8 | ALSC2_B82 (x(Sc) 0.66667) + LIQUID (x(Sc) 0.77467) + BCC_A2 (x(Sc) 0.79821) |
| AlSc-99Cac-LB.tdb | 1250.33 | ALSC2_B82 (x(Sc) 0.66667) + BCC_A2 (x(Sc) 0.87179) + HCP_A3 (x(Sc) 0.90804) |
| AlSc-99Cac-LB.tdb | 1250.33 | ALSC2_B82 (x(Sc) 0.66667) + BCC_A2 (x(Sc) 0.87188) + HCP_A3 (x(Sc) 0.90812) |
| AlSc-99Cac-LB.tdb | 930.94 | FCC_A1 (x(Sc) 0.0024) + LIQUID (x(Sc) 0.00575) + AL3SC_L12 (x(Sc) 0.25) |
| AlSc-99Cac-LB.tdb | 930.94 | FCC_A1 (x(Sc) 0.0024) + LIQUID (x(Sc) 0.00575) + AL3SC_L12 (x(Sc) 0.25) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/AL/AL-SC.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/AL/AL-SC.json) · [CALPHAD hull AlSc-98Mur](https://data.orchid-project.org/hulls/calphad-sgte/AL/AL-SC--AlSc-98Mur.json) · [CALPHAD hull AlSc-99Cac-LB](https://data.orchid-project.org/hulls/calphad-sgte/AL/AL-SC--AlSc-99Cac-LB.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Al–Sc system (70)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1814.15 | congruent melting: L -> βSc | βSc: Sc 1 | model | [1] Murray 1998 | Table 1, p. 1, row 9; `ORC-SLAUQQK7PM` |  |
| 1698 | congruent melting: Liquid -> Al2Sc | L: Al 0.666667, Sc 0.333333; Al2Sc: Al 0.666667, Sc 0.333333 | model | [2] Bo 2010; _cites Kang 2008_ [doi](https://doi.org/10.1016/j.calphad.2008.03.002) | Table 2, p. 6, row 11; `ORC-BYVGRKIMMC` |  |
| 1694 | congruent melting: Liquid -> Al2Sc | L: Sc 0.333; Al2Sc: Sc 0.333 | model | [2] Bo 2010 | Table 2, p. 6, row 12; `ORC-AUCK5AORHI` |  |
| 1693.15 | congruent melting: L->ScAl2 | L: Sc 0.333; ScAl2: Sc 0.333 | experimental | [3] Cacciamani 1999; _cites Naumkin 1965_ | Table 4, p. 7, row 7; `ORC-55KHEULI6V` |  |
| 1693.15 | congruent melting: L -> Al2Sc | L: Sc 0.333; Al2Sc: Sc 0.333 | model | [1] Murray 1998 | Table 1, p. 1, row 4; `ORC-W6HFOE7ZRT` |  |
| 1693 | congruent melting: Liquid -> Al2Sc | L: Sc 0.333; Al2Sc: Sc 0.333 | experimental | [2] Bo 2010; _cites Naumkin 1965_ | Table 2, p. 6, row 9; `ORC-YUA5JHZQ22` |  |
| 1664.65 | congruent melting: L->ScAl2 | L: Sc 0.333; ScAl2: Sc 0.333 | unspecified | [3] Cacciamani 1999 | Table 4, p. 7, row 8; `ORC-VIBUTGGLG2` |  |
| 1664.5 | congruent melting: Liquid -> Al2Sc | L: Sc 0.333; Al2Sc: Sc 0.333 | unspecified | [2] Bo 2010; _cites Cacciamani 1999_ [doi](https://doi.org/10.1016/s0966-9795%2898%2900022-3) | Table 2, p. 6, row 10; `ORC-6BLRFSODKI` |  |
| 1610.15 | peritectic: (αSc) -> L + (βSc) | (αSc): Sc 0.97; L: Sc 0.92; (βSc): Sc 0.98 | model | [1] Murray 1998 | Table 1, p. 1, row 10; `ORC-SFZZ7M4H2G` |  |
| 1593.15 | peritectic: L + Al2Sc -> Al3Sc | L: Sc 0.24; Al2Sc: Sc 0.333; Al3Sc: Sc 0.25 | model | [1] Murray 1998 | Table 1, p. 1, row 3; `ORC-2UJQWCSHLT` |  |
| 1593.15 | L+ScAl2->ScAl3 | L: Sc 0.24; ScAl2: Sc 0.333; ScAl3: Sc 0.25 | experimental | [3] Cacciamani 1999; _cites Naumkin 1965_ | Table 4, p. 7, row 5; `ORC-UFYZD7CUIZ` |  |
| 1593 | Liquid + Al2Sc -> Al3Sc | L: Sc 0.24; Al2Sc: Sc 0.333; Al3Sc: Sc 0.25 | experimental | [2] Bo 2010; _cites Naumkin 1965_ | Table 2, p. 6, row 5; `ORC-A6UO5BK3Q3` |  |
| 1591 | Liquid + Al2Sc -> Al3Sc | L: Sc 0.226; Al2Sc: Sc 0.333; Al3Sc: Sc 0.25 | model | [2] Bo 2010 | Table 2, p. 6, row 8; `ORC-IWO7JQS3PF` |  |
| 1589 | Liquid + Al2Sc -> Al3Sc | Al2Sc: Al 0.666667, Sc 0.333333; Al3Sc: Al 0.75, Sc 0.25 | model | [2] Bo 2010; _cites Kang 2008_ [doi](https://doi.org/10.1016/j.calphad.2008.03.002) | Table 2, p. 6, row 7; `ORC-WQZFKJKIF6` |  |
| 1574 | congruent melting: Liquid -> AlSc2 | L: Al 0.333333, Sc 0.666667; AlSc2: Al 0.333333, Sc 0.666667 | model | [2] Bo 2010; _cites Kang 2008_ [doi](https://doi.org/10.1016/j.calphad.2008.03.002) | Table 2, p. 6, row 27; `ORC-PO5M3YB2XM` |  |
| 1573.15 | congruent melting: L -> AlSc | L: Sc 0.5; AlSc: Sc 0.5 | model | [1] Murray 1998 | Table 1, p. 1, row 6; `ORC-GR6CR3QFSY` |  |
| 1573.15 | congruent melting: L->ScAl | L: Sc 0.5; ScAl: Sc 0.5 | experimental | [3] Cacciamani 1999; _cites Naumkin 1965_ | Table 4, p. 7, row 12; `ORC-QDIHBXM46W` |  |
| 1573.15 | congruent melting: L->Sc2Al | L: Sc 0.667; Sc2Al: Sc 0.667 | experimental | [3] Cacciamani 1999 | Table 4, p. 7, row 18; `ORC-SKJ7CQMK67` |  |
| 1573 | congruent melting: Liquid -> AlSc2 | L: Sc 0.667; AlSc2: Sc 0.667 | unspecified | [2] Bo 2010; _cites Cacciamani 1999_ [doi](https://doi.org/10.1016/s0966-9795%2898%2900022-3) | Table 2, p. 6, row 25; `ORC-WNSYKHCYMJ` |  |
| 1571 | congruent melting: Liquid -> AlSc2 | L: Sc 0.667; AlSc2: Sc 0.667 | model | [2] Bo 2010 | Table 2, p. 6, row 28; `ORC-MBQTJVDQVU` |  |
| 1560.15 | congruent melting: L->Sc2Al | L: Sc 0.667; Sc2Al: Sc 0.667 | unspecified | [3] Cacciamani 1999 | Table 4, p. 7, row 19; `ORC-AINHKT62LL` |  |
| 1560 | congruent melting: Liquid -> AlSc2 | L: Sc 0.667; AlSc2: Sc 0.667 | unspecified | [2] Bo 2010; _cites Cacciamani 1999_ [doi](https://doi.org/10.1016/s0966-9795%2898%2900022-3) | Table 2, p. 6, row 26; `ORC-VZ4AOQJFRE` |  |
| 1556.15 | L+ScAl2->ScAl3 | L: Sc 0.207; ScAl2: Sc 0.333; ScAl3: Sc 0.25 | unspecified | [3] Cacciamani 1999 | Table 4, p. 7, row 6; `ORC-BUS6B5SSBO` |  |
| 1556 | Liquid + Al2Sc -> Al3Sc | L: Sc 0.207; Al2Sc: Sc 0.333; Al3Sc: Sc 0.25 | unspecified | [2] Bo 2010; _cites Cacciamani 1999_ [doi](https://doi.org/10.1016/s0966-9795%2898%2900022-3) | Table 2, p. 6, row 6; `ORC-YTLT2MJOR4` |  |
| 1519 | congruent melting: Liquid -> AlSc | L: Al 0.5, Sc 0.5; AlSc: Al 0.5, Sc 0.5 | model | [2] Bo 2010; _cites Kang 2008_ [doi](https://doi.org/10.1016/j.calphad.2008.03.002) | Table 2, p. 6, row 19; `ORC-Z6XKAMAM6W` |  |
| 1513.15 | congruent melting: L->ScAl | L: Sc 0.5; ScAl: Sc 0.5 | experimental | [3] Cacciamani 1999 | Table 4, p. 7, row 13; `ORC-A74BDQ46DE` |  |
| 1513 | congruent melting: Liquid -> AlSc | L: Sc 0.5; AlSc: Sc 0.5 | unspecified | [2] Bo 2010; _cites Cacciamani 1999_ [doi](https://doi.org/10.1016/s0966-9795%2898%2900022-3) | Table 2, p. 6, row 17; `ORC-5G7LKOUDZK` |  |
| 1509 | congruent melting: Liquid -> AlSc | L: Sc 0.5; AlSc: Sc 0.5 | model | [2] Bo 2010 | Table 2, p. 6, row 20; `ORC-RGFM7KVJ5L` |  |
| 1508 | eutectic: Liquid -> Al2Sc + AlSc | Al2Sc: Al 0.666667, Sc 0.333333; AlSc: Al 0.5, Sc 0.5 | model | [2] Bo 2010; _cites Kang 2008_ [doi](https://doi.org/10.1016/j.calphad.2008.03.002) | Table 2, p. 6, row 15; `ORC-RKJLTW4TNQ` |  |
| 1507.25 | congruent melting: L->ScAl | L: Sc 0.5; ScAl: Sc 0.5 | unspecified | [3] Cacciamani 1999 | Table 4, p. 7, row 14; `ORC-LMJEQG5LEO` |  |
| 1507.1 | congruent melting: Liquid -> AlSc | L: Sc 0.5; AlSc: Sc 0.5 | unspecified | [2] Bo 2010; _cites Cacciamani 1999_ [doi](https://doi.org/10.1016/s0966-9795%2898%2900022-3) | Table 2, p. 6, row 18; `ORC-AAPG5U5DEC` |  |
| 1506.75 | eutectic: L->ScAl2+ScAl | L: Sc 0.491; ScAl2: Sc 0.333; ScAl: Sc 0.5 | unspecified | [3] Cacciamani 1999 | Table 4, p. 7, row 11; `ORC-SAK2NOVHH7` |  |
| 1506.6 | eutectic: Liquid -> Al2Sc + AlSc | L: Sc 0.491; Al2Sc: Sc 0.333; AlSc: Sc 0.5 | unspecified | [2] Bo 2010; _cites Cacciamani 1999_ [doi](https://doi.org/10.1016/s0966-9795%2898%2900022-3) | Table 2, p. 6, row 14; `ORC-6TNNB4GXZG` |  |
| 1505 | eutectic: Liquid -> Al2Sc + AlSc | L: Sc 0.478; Al2Sc: Sc 0.333; AlSc: Sc 0.5 | model | [2] Bo 2010 | Table 2, p. 6, row 16; `ORC-VRAJBQTC4M` |  |
| 1493.15 | eutectic: L->ScAl+Sc2Al | L: Sc 0.58; ScAl: Sc 0.5; Sc2Al: Sc 0.667 | experimental | [3] Cacciamani 1999 | Table 4, p. 7, row 16; `ORC-LFGC7RMSDO` |  |
| 1479 | eutectic: Liquid -> AlSc2 + βSc | AlSc2: Al 0.333333, Sc 0.666667 | model | [2] Bo 2010; _cites Kang 2008_ [doi](https://doi.org/10.1016/j.calphad.2008.03.002) | Table 2, p. 6, row 31; `ORC-C2XAHBA7YY` |  |
| 1478.25 | eutectic: L->ScAl+Sc2Al | L: Sc 0.566; ScAl: Sc 0.5; Sc2Al: Sc 0.667 | unspecified | [3] Cacciamani 1999 | Table 4, p. 7, row 17; `ORC-UVC5MDZ2IW` |  |
| 1478.1 | eutectic: Liquid -> AlSc + AlSc2 | L: Sc 0.566; AlSc: Sc 0.5; AlSc2: Sc 0.667 | unspecified | [2] Bo 2010; _cites Cacciamani 1999_ [doi](https://doi.org/10.1016/s0966-9795%2898%2900022-3) | Table 2, p. 6, row 22; `ORC-M2GXF4VGGJ` |  |
| 1474 | eutectic: Liquid -> AlSc + AlSc2 | AlSc: Al 0.5, Sc 0.5; AlSc2: Al 0.333333, Sc 0.666667 | model | [2] Bo 2010; _cites Kang 2008_ [doi](https://doi.org/10.1016/j.calphad.2008.03.002) | Table 2, p. 6, row 23; `ORC-Z67FWZOS2V` |  |
| 1472 | eutectic: Liquid -> AlSc + AlSc2 | L: Sc 0.565; AlSc: Sc 0.5; AlSc2: Sc 0.667 | model | [2] Bo 2010 | Table 2, p. 6, row 24; `ORC-B3572UCO4G` |  |
| 1472 | eutectic: Liquid -> AlSc2 + βSc | L: Sc 0.774; AlSc2: Sc 0.667; βSc: Sc 0.846 | model | [2] Bo 2010 | Table 2, p. 6, row 32; `ORC-B7MRKKQW32` |  |
| 1468.15 | eutectic: L->ScAl+Sc2Al | ScAl: Sc 0.5; Sc2Al: Sc 0.667 | experimental | [3] Cacciamani 1999; _cites Naumkin 1965_ | Table 4, p. 7, row 15; `ORC-BMVA65OCA3` |  |
| 1468.15 | peritectic: L + AlSc -> AlSc2 | L: Sc 0.7; AlSc: Sc 0.5; AlSc2: Sc 0.667 | model | [1] Murray 1998 | Table 1, p. 1, row 7; `ORC-TB66GI3D2Z` |  |
| 1468 | eutectic: Liquid -> AlSc + AlSc2 | AlSc: Sc 0.5; AlSc2: Sc 0.667 | experimental | [2] Bo 2010; _cites Naumkin 1965_ | Table 2, p. 6, row 21; `ORC-ICQGP6VBR4` |  |
| 1463.15 | eutectic: L->ScAl2+ScAl | L: Sc 0.45; ScAl2: Sc 0.333; ScAl: Sc 0.5 | experimental | [3] Cacciamani 1999 | Table 4, p. 7, row 10; `ORC-NDMT36NUHB` |  |
| 1463 | eutectic: Liquid -> Al2Sc + AlSc | L: Sc 0.45; Al2Sc: Sc 0.333; AlSc: Sc 0.5 | unspecified | [2] Bo 2010; _cites Cacciamani 1999_ [doi](https://doi.org/10.1016/s0966-9795%2898%2900022-3) | Table 2, p. 6, row 13; `ORC-KUCZHSFYWV` |  |
| 1460.75 | eutectic: L->Sc2Al+(βSc) | L: Sc 0.775; Sc2Al: Sc 0.667; (βSc): Sc 0.798 | unspecified | [3] Cacciamani 1999 | Table 4, p. 7, row 21; `ORC-TFPNRY3QEQ` |  |
| 1460.6 | eutectic: Liquid -> AlSc2 + βSc | L: Sc 0.775; AlSc2: Sc 0.667; βSc: Sc 0.798 | unspecified | [2] Bo 2010; _cites Cacciamani 1999_ [doi](https://doi.org/10.1016/s0966-9795%2898%2900022-3) | Table 2, p. 6, row 30; `ORC-W4EPMSZBAA` |  |
| 1458.15 | eutectic: L->Sc2Al+(βSc) | L: Sc 0.77; Sc2Al: Sc 0.667; (βSc): Sc 0.81 | experimental | [3] Cacciamani 1999 | Table 4, p. 7, row 20; `ORC-5ERFNQ3MIF` |  |
| 1458 | eutectic: Liquid -> AlSc2 + βSc | L: Sc 0.77; AlSc2: Sc 0.667; βSc: Sc 0.81 | unspecified | [2] Bo 2010; _cites Cacciamani 1999_ [doi](https://doi.org/10.1016/s0966-9795%2898%2900022-3) | Table 2, p. 6, row 29; `ORC-EVSDUFCLUW` |  |
| 1423.15 | eutectic: L -> Al2Sc + AlSc | L: Sc 0.45; Al2Sc: Sc 0.333; AlSc: Sc 0.5 | model | [1] Murray 1998 | Table 1, p. 1, row 5; `ORC-3HQFAAADQD` |  |
| 1423.15 | eutectic: L->ScAl2+ScAl | L: Sc 0.43; ScAl2: Sc 0.033; ScAl: Sc 0.5 | experimental | [3] Cacciamani 1999; _cites Naumkin 1965_ | Table 4, p. 7, row 9; `ORC-CSVLEWKAMV` |  |
| 1250.25 | (βSc)->Sc2Al+(αSc) | (βSc): Sc 0.872; Sc2Al: Sc 0.667; (αSc): Sc 0.908 | unspecified | [3] Cacciamani 1999 | Table 4, p. 7, row 24; `ORC-XPPARB5N47` |  |
| 1250.1 | βSc -> AlSc2 + αSc | βSc: Sc 0.872; AlSc2: Sc 0.667; αSc: Sc 0.908 | unspecified | [2] Bo 2010; _cites Cacciamani 1999_ [doi](https://doi.org/10.1016/s0966-9795%2898%2900022-3) | Table 2, p. 6, row 34; `ORC-JNAEE4U57R` |  |
| 1243.15 | (βSc)->Sc2Al+(αSc) | (βSc): Sc 0.85; Sc2Al: Sc 0.667; (αSc): Sc 0.93 | experimental | [3] Cacciamani 1999 | Table 4, p. 7, row 23; `ORC-CTK35ADYJ5` |  |
| 1243 | βSc -> AlSc2 + αSc | βSc: Sc 0.85; AlSc2: Sc 0.667; αSc: Sc 0.93 | unspecified | [2] Bo 2010; _cites Cacciamani 1999_ [doi](https://doi.org/10.1016/s0966-9795%2898%2900022-3) | Table 2, p. 6, row 33; `ORC-OBUQH3735E` |  |
| 1242 | βSc -> AlSc2 + αSc | βSc: Sc 0.881; AlSc2: Sc 0.667; αSc: Sc 0.898 | model | [2] Bo 2010 | Table 2, p. 6, row 36; `ORC-CCKQNO7EUH` |  |
| 1233 | βSc -> AlSc2 + αSc | AlSc2: Al 0.333333, Sc 0.666667 | model | [2] Bo 2010; _cites Kang 2008_ [doi](https://doi.org/10.1016/j.calphad.2008.03.002) | Table 2, p. 6, row 35; `ORC-CFIQXQHUUK` |  |
| 1218.15 | eutectic: L->Sc2Al+(αSc) | L: Sc 0.87; Sc2Al: Sc 0.667; (αSc): Sc 0.9 | experimental | [3] Cacciamani 1999; _cites Naumkin 1965_ | Table 4, p. 7, row 22; `ORC-KP2FFKUOCP` |  |
| 1218.15 | eutectic: L -> AlSc2 + (αSc) | L: Sc 0.87; AlSc2: Sc 0.667; (αSc): Sc 0.96 | model | [1] Murray 1998 | Table 1, p. 1, row 8; `ORC-O44RT44XD7` |  |
| 933.602 | congruent melting: L -> Al | Al: Sc 0 | model | [1] Murray 1998 | Table 1, p. 1, row 1; `ORC-KCRFMMVDG3` |  |
| 933.15 | eutectic: L -> (Al) + Al3Sc | L: Sc 0.005; (Al): Sc 0.0038; Al3Sc: Sc 0.25 | model | [1] Murray 1998 | Table 1, p. 1, row 2; `ORC-INNWOJTCQS` |  |
| 933 | eutectic: Liquid -> Fcc_Al + Al3Sc | Al3Sc: Al 0.75, Sc 0.25 | model | [2] Bo 2010; _cites Kang 2008_ [doi](https://doi.org/10.1016/j.calphad.2008.03.002) | Table 2, p. 6, row 3; `ORC-LT44UE7UEI` |  |
| 933 | eutectic: Liquid -> Fcc_Al + Al3Sc | L: Sc 0.00303; Fcc_Al: Sc 0.002; Al3Sc: Sc 0.25 | model | [2] Bo 2010 | Table 2, p. 6, row 4; `ORC-PTBISIIOYI` |  |
| 932.15 | eutectic: L->(Al)+ScAl3 | L: Sc 0.00313; (Al): Sc 0.00228; ScAl3: Sc 0.25 | experimental | [3] Cacciamani 1999; _cites LA 1971_ | Table 4, p. 7, row 1; `ORC-CQU7FRA3EU` |  |
| 932 | eutectic: Liquid -> Fcc_Al + Al3Sc | L: Sc 0.00313; Fcc_Al: Sc 0.00228; Al3Sc: Sc 0.25 | experimental | [2] Bo 2010; _cites Willey 1971_ | Table 2, p. 6, row 1; `ORC-U3ZEF243JR` |  |
| 931.15 | eutectic: L->(Al)+ScAl3 | L: Sc 0.0036; (Al): Sc 0.00228; ScAl3: Sc 0.25 | experimental | [3] Cacciamani 1999; _cites Kononenko 1990_ | Table 4, p. 7, row 3; `ORC-OO6VJHY23S` |  |
| 929.65 | eutectic: L->(Al)+ScAl3 | L: Sc 0.00566; (Al): Sc 0.00415; ScAl3: Sc 0.25 | unspecified | [3] Cacciamani 1999 | Table 4, p. 7, row 4; `ORC-CKR3MW2ZPJ` |  |
| 929.5 | eutectic: Liquid -> Fcc_Al + Al3Sc | L: Sc 0.00566; Fcc_Al: Sc 0.00415; Al3Sc: Sc 0.25 | unspecified | [2] Bo 2010; _cites Cacciamani 1999_ [doi](https://doi.org/10.1016/s0966-9795%2898%2900022-3) | Table 2, p. 6, row 2; `ORC-F4HFXB6Q5U` |  |
| 928.15 | eutectic: L->(Al)+ScAl3 | L: Sc 0.0033; (Al): Sc 0.0021; ScAl3: Sc 0.25 | experimental | [3] Cacciamani 1999; _cites Drits 1973_ | Table 4, p. 7, row 2; `ORC-PICPAQL36I` |  |

## Other properties

### Crystal structure (33)

Table: Crystal structure, Al–Sc system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Lattice a | 7.6 Å | 298.15 | Al2Sc; _alloy: Sc 0.333333_ | model | [4] Hu 2018; _cites Villars 1997_ | Table 1, p. 2, row 7; `ORC-2VELKITNTL.89164a` |  |
| Lattice a | 7.582 Å | 298.15 | Al2Sc; _Al2Sc: Al 0.667, Sc 0.333_ | unspecified | [1] Murray 1998 | Table 3, p. 1, row 3; `ORC-UJZ5BTEQNS` |  |
| Lattice a | 4.1 Å | 298.15 | Al3Sc; _alloy: Sc 0.25_ | model | [4] Hu 2018; _cites Villars 1997_ | Table 1, p. 2, row 6; `ORC-2NYZH7HVP2.781346` |  |
| Lattice a | 4.103 Å | 298.15 | Al3Sc; _Al3Sc: Al 0.75, Sc 0.25_ | unspecified | [1] Murray 1998 | Table 3, p. 1, row 2; `ORC-E2KQTU64M7` |  |
| Lattice a | 3.45 Å | 298.15 | AlSc; _alloy: Sc 0.5_ | model | [4] Hu 2018; _cites Villars 1997_ | Table 1, p. 2, row 8; `ORC-HDCRGCGAK7.9c8022` |  |
| Lattice a | 3.45 Å | 298.15 | AlSc; _AlSc: Al 0.5, Sc 0.5_ | unspecified | [1] Murray 1998 | Table 3, p. 1, row 4; `ORC-SE2QN4IIHV` |  |
| Lattice a | 4.888 Å | 298.15 | AlSc2; _alloy: Sc 0.666667_ | model | [4] Hu 2018; _cites Villars 1997_ | Table 1, p. 2, row 9; `ORC-7TVA4XQQN2.a7ccbd` |  |
| Lattice a | 4.888 Å | 298.15 | AlSc2; _AlSc2: Al 0.333, Sc 0.667_ | unspecified | [1] Murray 1998 | Table 3, p. 1, row 5; `ORC-SJ4IZONHKF.cadd1f` |  |
| Lattice a | 4.8813 Å | 298.15 | Sc2Al; _alloy: Sc 0.666667_ | experimental | [3] Cacciamani 1999; _cites Schuster 1985_ [doi](https://doi.org/10.1016/0022-5088%2885%2990066-9) | Table 1, p. 2, row 2; `ORC-HETVZGRQ62.79969b` |  |
| Lattice a | 4.888 Å | 298.15 | Sc2Al; _alloy: Sc 0.666667_ | experimental | [3] Cacciamani 1999; _cites Eymond 1969_ [doi](https://doi.org/10.1016/0022-5088%2869%2990191-x) | Table 1, p. 2, row 1; `ORC-HPPDBSM56W.a62ef0` |  |
| Lattice a | 4.887 Å | 298.15 | Sc2Al; _alloy: Sc 0.666667_ | experimental | [3] Cacciamani 1999 | Table 1, p. 2, row 3; `ORC-W4WGQDTJRA.6ef3fc` |  |
| Lattice a | 3.988 Å | 298.15 | ScAl; _alloy: Sc 0.5_ | experimental | [3] Cacciamani 1999; _cites Schuster 1985_ [doi](https://doi.org/10.1016/0022-5088%2885%2990066-9) | Table 1, p. 2, row 5; `ORC-E4WCTERNVL.0ff4bc` |  |
| Lattice a | 3.45 Å | 298.15 | ScAl; _alloy: Sc 0.5_ | experimental | [3] Cacciamani 1999; _cites Schob 1965_ [doi](https://doi.org/10.1107/s0365110x65003134) | Table 1, p. 2, row 4; `ORC-FJJTEM7GGC.ac6a09` |  |
| Lattice a | 7.58 Å | 298.15 | ScAl2; _alloy: Sc 0.333333_ | experimental | [3] Cacciamani 1999; _cites Rechkin 1964_ | Table 1, p. 2, row 6; `ORC-5YCJ5VJTQZ.19c989` |  |
| Lattice a | 7.5748 Å | 298.15 | ScAl2; _alloy: Sc 0.333333_ | experimental | [3] Cacciamani 1999; _cites Schuster 1985_ [doi](https://doi.org/10.1016/0022-5088%2885%2990066-9) | Table 1, p. 2, row 7; `ORC-K4AAJQ4WI5.7db5ee` |  |
| Lattice a | 7.578 Å | 298.15 | ScAl2; _alloy: Sc 0.333333_ | experimental | [3] Cacciamani 1999 | Table 1, p. 2, row 8; `ORC-PYAL5L3AB2.78c5f6` |  |
| Lattice a | 4.1 Å | 298.15 | ScAl3; _alloy: Sc 0.25_ | experimental | [3] Cacciamani 1999; _cites Rechkin 1964_ | Table 1, p. 2, row 9; `ORC-AQU77FFZPB.763ed6` |  |
| Lattice a | 4.103 Å | 298.15 | ScAl3; _alloy: Sc 0.25_ | experimental | [3] Cacciamani 1999 | Table 1, p. 2, row 11; `ORC-BKUHTILTQF.ad5544` |  |
| Lattice a | 4.101 Å | 298.15 | ScAl3; _alloy: Sc 0.25_ | experimental | [3] Cacciamani 1999; _cites Schuster 1985_ [doi](https://doi.org/10.1016/0022-5088%2885%2990066-9) | Table 1, p. 2, row 10; `ORC-DDR3M6J4QH.0cc8e9` |  |
| Lattice b | 7.6 Å | 298.15 | Al2Sc; _alloy: Sc 0.333333_ | model | [4] Hu 2018; _cites Villars 1997_ | Table 1, p. 2, row 7; `ORC-2VELKITNTL.4566f1` |  |
| Lattice b | 4.1 Å | 298.15 | Al3Sc; _alloy: Sc 0.25_ | model | [4] Hu 2018; _cites Villars 1997_ | Table 1, p. 2, row 6; `ORC-2NYZH7HVP2.0a529f` |  |
| Lattice b | 3.45 Å | 298.15 | AlSc; _alloy: Sc 0.5_ | model | [4] Hu 2018; _cites Villars 1997_ | Table 1, p. 2, row 8; `ORC-HDCRGCGAK7.6628c2` |  |
| Lattice b | 4.888 Å | 298.15 | AlSc2; _alloy: Sc 0.666667_ | model | [4] Hu 2018; _cites Villars 1997_ | Table 1, p. 2, row 9; `ORC-7TVA4XQQN2.08984c` |  |
| Lattice b | 9.882 Å | 298.15 | ScAl; _alloy: Sc 0.5_ | experimental | [3] Cacciamani 1999; _cites Schuster 1985_ [doi](https://doi.org/10.1016/0022-5088%2885%2990066-9) | Table 1, p. 2, row 5; `ORC-E4WCTERNVL.4ace67` |  |
| Lattice c | 7.6 Å | 298.15 | Al2Sc; _alloy: Sc 0.333333_ | model | [4] Hu 2018; _cites Villars 1997_ | Table 1, p. 2, row 7; `ORC-2VELKITNTL.7e4fb1` |  |
| Lattice c | 4.1 Å | 298.15 | Al3Sc; _alloy: Sc 0.25_ | model | [4] Hu 2018; _cites Villars 1997_ | Table 1, p. 2, row 6; `ORC-2NYZH7HVP2.f8337d` |  |
| Lattice c | 3.45 Å | 298.15 | AlSc; _alloy: Sc 0.5_ | model | [4] Hu 2018; _cites Villars 1997_ | Table 1, p. 2, row 8; `ORC-HDCRGCGAK7.45edfa` |  |
| Lattice c | 6.166 Å | 298.15 | AlSc2; _alloy: Sc 0.666667_ | model | [4] Hu 2018; _cites Villars 1997_ | Table 1, p. 2, row 9; `ORC-7TVA4XQQN2.18fe58` |  |
| Lattice c | 6.166 Å | 298.15 | AlSc2; _AlSc2: Al 0.333, Sc 0.667_ | unspecified | [1] Murray 1998 | Table 3, p. 1, row 5; `ORC-SJ4IZONHKF.f48623` |  |
| Lattice c | 6.167 Å | 298.15 | Sc2Al; _alloy: Sc 0.666667_ | experimental | [3] Cacciamani 1999; _cites Schuster 1985_ [doi](https://doi.org/10.1016/0022-5088%2885%2990066-9) | Table 1, p. 2, row 2; `ORC-HETVZGRQ62.1f6c1d` |  |
| Lattice c | 6.166 Å | 298.15 | Sc2Al; _alloy: Sc 0.666667_ | experimental | [3] Cacciamani 1999; _cites Eymond 1969_ [doi](https://doi.org/10.1016/0022-5088%2869%2990191-x) | Table 1, p. 2, row 1; `ORC-HPPDBSM56W.5be556` |  |
| Lattice c | 6.173 Å | 298.15 | Sc2Al; _alloy: Sc 0.666667_ | experimental | [3] Cacciamani 1999 | Table 1, p. 2, row 3; `ORC-W4WGQDTJRA.c5ee8d` |  |
| Lattice c | 3.652 Å | 298.15 | ScAl; _alloy: Sc 0.5_ | experimental | [3] Cacciamani 1999; _cites Schuster 1985_ [doi](https://doi.org/10.1016/0022-5088%2885%2990066-9) | Table 1, p. 2, row 5; `ORC-E4WCTERNVL.04ba22` |  |

## Sources

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

1. J. L. Murray, The Al-Sc (aluminum-scandium) system, JPE 19, 380-384 (1998). [doi:10.1361/105497198770342120](https://doi.org/10.1361/105497198770342120)
2. H. Bo, L.B. Liu, Z.P. Jin, Thermodynamic analysis of Al–Sc, Cu–Sc and Al–Cu–Sc system, Journal of Alloys and Compounds 490, 318-325 (2010). [doi:10.1016/j.jallcom.2009.10.003](https://doi.org/10.1016/j.jallcom.2009.10.003)
3. G. Cacciamani, P. Riani, G. Borzone, N. Parodi, A. Saccone, R. Ferro et al., Thermodynamic measurements and assessment of the Al–Sc system, Intermetallics 7, 101-108 (1999). [doi:10.1016/s0966-9795(98)00022-3](https://doi.org/10.1016/s0966-9795%2898%2900022-3)
4. J.L. Hu, H. Bo, L.B. Liu, Z.P. Jin, Thermodynamic study of the Al-Sc-Y system, Thermochimica Acta 661, 147-159 (2018). [doi:10.1016/j.tca.2018.01.018](https://doi.org/10.1016/j.tca.2018.01.018)

## 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/).