Al–Nb system
86 accepted literature values from 6 paper(s) (experimental 36, model 44, DFT 1, unspecified 5); 6 calculated phase diagram(s). 16 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 (15) · papers (bibliography) · Markdown
| Evidence class | Values |
|---|---|
| experimental | 36 |
| model | 44 |
| DFT | 1 |
| unspecified | 5 |
| Property group | Values |
|---|---|
| invariant reaction | 67 |
| phase transition | 9 |
| phase equilibrium | 3 |
| heat capacity / entropy / enthalpy | 2 |
| crystal structure | 5 |
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.
| TDB file | Assessment | SHA-256 | Links |
|---|---|---|---|
| AlNb-08Zhu.tdb | Z. Zhu, Y. Du, L. Zhang, H. Chen, H. Xu, C. Tang, J. Alloys Compd., 460, 632-38(2008). doi:10.1016/j.jallcom.2007.06.033 | a89bdff6737f8160e2c61a7bb8ebf76bad9e95e55fe85aa80f15572005a561b8 | viewer · TDB · JSON |
| AlNb-09Wit.tdb | V.T. Witusiewicz, A.A. Bondar, U. Hecht, T.Ya. Velikanova, J. Alloys Compd., 472, 133-61(2009). doi:10.1016/j.jallcom.2008.05.008 | 4dcb4c37be340beecd788f6e4540d9c11a4a5dc46ef7edb1d4a0e11137471286 | viewer · TDB · JSON |
| AlNb-15He.tdb | C. He, F. Stein, M. Palm, J. Alloys Compd., 637, 361-75(2015). doi:10.1016/j.jallcom.2015.02.182 | d55f60a76b49353c6a944c46a11c7599c258955a60870ec673004d5c3234eeba | viewer · TDB · JSON |
| AlNb-23Fio.tdb | J.M. Fiorani, M. Badran, J.M. Joubert, J.C. Crivello, A.A.A.P. da Silva, G.C. Coelho, C.A. Nunes, N. David, M. Vilasi, Calphad, 80, 102522(2023). doi:10.1016/j.calphad.2022.102522 | f8fec1a8af356181165ab869e73768bf92605c9c8da860c081a33db98dd99cdd | viewer · TDB · JSON |
| AlNb-97Ser-LB.tdb | C. Servant, I. Ansara, J. Chim. Phys., 94, 869-88(1997). | b55876dc0b3e6a6b34a6b58cd71234fda73d7b8686ef1d3b802c97f6e7a38165 | viewer · TDB · JSON |
| AlNb-98Sau.tdb | N. Saunders, COST 507, Final report round 2, 1998. | 62c0666d7a7aae9c3c2b5bbc5b2144cb74a7e940933672ea064805da245abb3e | viewer · TDB · JSON |
| TDB file | T (K) | Phases at the invariant |
|---|---|---|
| AlNb-08Zhu.tdb | 2332.94 | LIQUID (x(Nb) 0.73914) + ALNB3_A15 (x(Nb) 0.77801) + B2_BCC (x(Nb) 0.80141) |
| AlNb-08Zhu.tdb | 2207.54 | LIQUID (x(Nb) 0.65028) + SIGMA_D8B (x(Nb) 0.68811) + ALNB3_A15 (x(Nb) 0.762) |
| AlNb-08Zhu.tdb | 1860.63 | AL3NB_D022 (x(Nb) 0.25) + LIQUID (x(Nb) 0.42011) + SIGMA_D8B (x(Nb) 0.59332) |
| AlNb-08Zhu.tdb | 934.54 | LIQUID (x(Nb) 1.000e-5) + FCC_A1 (x(Nb) 0.00153) + AL3NB_D022 (x(Nb) 0.25) |
| AlNb-08Zhu.tdb | 934.54 | LIQUID (x(Nb) 1.000e-5) + FCC_A1 (x(Nb) 0.00153) + AL3NB_D022 (x(Nb) 0.25) |
| AlNb-09Wit.tdb | 2334.71 | LIQUID (x(Nb) 0.73443) + ALNB3_A15 (x(Nb) 0.77476) + B2_BCC (x(Nb) 0.80519) |
| AlNb-09Wit.tdb | 2211.75 | LIQUID (x(Nb) 0.64766) + SIGMA_D8B (x(Nb) 0.69744) + ALNB3_A15 (x(Nb) 0.75124) |
| AlNb-09Wit.tdb | 1844.01 | AL3NB_D022 (x(Nb) 0.25717) + LIQUID (x(Nb) 0.43788) + SIGMA_D8B (x(Nb) 0.61314) |
| AlNb-09Wit.tdb | 934.52 | LIQUID (x(Nb) 2.000e-5) + FCC_A1 (x(Nb) 0.0015) + AL3NB_D022 (x(Nb) 0.24999) |
| AlNb-09Wit.tdb | 934.52 | LIQUID (x(Nb) 2.000e-5) + FCC_A1 (x(Nb) 0.0015) + AL3NB_D022 (x(Nb) 0.24999) |
| AlNb-15He.tdb | 2331.21 | LIQUID (x(Nb) 0.73726) + ALNB3_A15 (x(Nb) 0.78275) + BCC_A2 (x(Nb) 0.80133) |
| AlNb-15He.tdb | 2212.73 | LIQUID (x(Nb) 0.64963) + SIGMA_D8B (x(Nb) 0.69444) + ALNB3_A15 (x(Nb) 0.76602) |
| AlNb-15He.tdb | 1854.54 | AL3NB_D022 (x(Nb) 0.2542) + LIQUID (x(Nb) 0.43553) + SIGMA_D8B (x(Nb) 0.59363) |
| AlNb-15He.tdb | 934.48 | LIQUID (x(Nb) 4.000e-5) + FCC_A1 (x(Nb) 0.00149) + AL3NB_D022 (x(Nb) 0.24856) |
| AlNb-15He.tdb | 934.48 | LIQUID (x(Nb) 4.000e-5) + FCC_A1 (x(Nb) 0.00149) + AL3NB_D022 (x(Nb) 0.24856) |
| AlNb-23Fio.tdb | 2335.05 | LIQUID (x(Nb) 0.72982) + ALNB3_A15 (x(Nb) 0.78738) + BCC_A2 (x(Nb) 0.80298) |
| AlNb-23Fio.tdb | 2205.36 | LIQUID (x(Nb) 0.64491) + SIG2SL (x(Nb) 0.69097) + ALNB3_A15 (x(Nb) 0.75931) |
| AlNb-23Fio.tdb | 2205.36 | LIQUID (x(Nb) 0.64491) + SIG2SL3 (x(Nb) 0.69097) + ALNB3_A15 (x(Nb) 0.75931) |
| AlNb-23Fio.tdb | 2205.36 | LIQUID (x(Nb) 0.64491) + SIG2SL5 (x(Nb) 0.69097) + ALNB3_A15 (x(Nb) 0.75931) |
| AlNb-23Fio.tdb | 1862.13 | LIQUID (x(Nb) 0.42808) + SIGMA_D8B (x(Nb) 0.54277) + SIG2SL (x(Nb) 0.55329) |
| AlNb-23Fio.tdb | 1862.13 | LIQUID (x(Nb) 0.42808) + SIGMA_D8B (x(Nb) 0.54277) + SIG2SL5 (x(Nb) 0.55329) |
| AlNb-23Fio.tdb | 1862.13 | LIQUID (x(Nb) 0.42808) + SIGMA_D8B (x(Nb) 0.54277) + SIG2SL3 (x(Nb) 0.55329) |
| AlNb-23Fio.tdb | 1848.39 | AL3NB_D022 (x(Nb) 0.25816) + LIQUID (x(Nb) 0.41963) + SIGMA_D8B (x(Nb) 0.52335) |
| AlNb-23Fio.tdb | 1787.89 | AL3NB_D022 (x(Nb) 0.25678) + SIGMA_D8B (x(Nb) 0.54413) + SIG2SL (x(Nb) 0.55259) |
| AlNb-23Fio.tdb | 1787.89 | AL3NB_D022 (x(Nb) 0.25678) + SIGMA_D8B (x(Nb) 0.54413) + SIG2SL5 (x(Nb) 0.55259) |
| AlNb-23Fio.tdb | 1787.89 | AL3NB_D022 (x(Nb) 0.25678) + SIGMA_D8B (x(Nb) 0.54413) + SIG2SL3 (x(Nb) 0.55259) |
| AlNb-23Fio.tdb | 934.5 | LIQUID (x(Nb) 5.000e-5) + FCC_A1 (x(Nb) 0.00155) + AL3NB_D022 (x(Nb) 0.25) |
| AlNb-23Fio.tdb | 934.5 | LIQUID (x(Nb) 4.000e-5) + FCC_A1 (x(Nb) 0.0015) + AL3NB_D022 (x(Nb) 0.25) |
| AlNb-23Fio.tdb | 934.5 | LIQUID (x(Nb) 4.000e-5) + FCC_A1 (x(Nb) 0.0015) + AL3NB_D022 (x(Nb) 0.25) |
| AlNb-23Fio.tdb | 509.49 | SIG2SL (x(Nb) 0.66818) + ALNB3_A15 (x(Nb) 0.77912) + BCC_A2 (x(Nb) 0.98834) |
| AlNb-23Fio.tdb | 509.49 | SIG2SL3 (x(Nb) 0.66818) + ALNB3_A15 (x(Nb) 0.77912) + BCC_A2 (x(Nb) 0.98834) |
| AlNb-23Fio.tdb | 509.49 | SIG2SL5 (x(Nb) 0.66818) + ALNB3_A15 (x(Nb) 0.77912) + BCC_A2 (x(Nb) 0.98834) |
| AlNb-97Ser-LB.tdb | 2323.98 | LIQUID (x(Nb) 0.71187) + ALNB3_A15 (x(Nb) 0.78331) + BCC_A2 (x(Nb) 0.81955) |
| AlNb-97Ser-LB.tdb | 2207.81 | LIQUID (x(Nb) 0.63129) + SIGMA_D8B (x(Nb) 0.69377) + ALNB3_A15 (x(Nb) 0.74601) |
| AlNb-97Ser-LB.tdb | 1869.54 | AL3NB_D022 (x(Nb) 0.25517) + LIQUID (x(Nb) 0.41931) + SIGMA_D8B (x(Nb) 0.59584) |
| AlNb-97Ser-LB.tdb | 934.19 | LIQUID (x(Nb) 1.000e-5) + FCC_A1 (x(Nb) 0.00104) + AL3NB_D022 (x(Nb) 0.24999) |
| AlNb-97Ser-LB.tdb | 934.19 | LIQUID (x(Nb) 1.000e-5) + FCC_A1 (x(Nb) 0.00104) + AL3NB_D022 (x(Nb) 0.24999) |
| AlNb-98Sau.tdb | 2333.74 | LIQUID (x(Nb) 0.7184) + ALNB3_A15 (x(Nb) 0.78172) + B2_BCC (x(Nb) 0.83086) |
| AlNb-98Sau.tdb | 2237.63 | LIQUID (x(Nb) 0.64747) + SIGMA_OLD (x(Nb) 0.68285) + ALNB3_A15 (x(Nb) 0.77213) |
| AlNb-98Sau.tdb | 1832.15 | AL3NB_D022 (x(Nb) 0.25) + LIQUID (x(Nb) 0.41204) + SIGMA_OLD (x(Nb) 0.59631) |
| AlNb-98Sau.tdb | 1832.15 | AL3NB_D022 (x(Nb) 0.25) + LIQUID (x(Nb) 0.41193) + SIGMA_OLD (x(Nb) 0.59625) |
| AlNb-98Sau.tdb | 934.57 | LIQUID (x(Nb) 1.000e-5) + FCC_A1 (x(Nb) 0.00166) + AL3NB_D022 (x(Nb) 0.25) |
| AlNb-98Sau.tdb | 934.57 | LIQUID (x(Nb) 1.000e-5) + FCC_A1 (x(Nb) 0.00162) + AL3NB_D022 (x(Nb) 0.25) |
| AlNb-98Sau.tdb | 934.57 | LIQUID (x(Nb) 1.000e-5) + FCC_A1 (x(Nb) 0.00162) + AL3NB_D022 (x(Nb) 0.25) |
| AlNb-98Sau.tdb | 765.8 | AL3NB_D022 (x(Nb) 0.25) + B2_BCC (x(Nb) 0.5547) + SIGMA_OLD (x(Nb) 0.63573) |
| AlNb-98Sau.tdb | 765.8 | AL3NB_D022 (x(Nb) 0.25) + B2_BCC (x(Nb) 0.5547) + SIGMA_OLD (x(Nb) 0.63573) |
| AlNb-98Sau.tdb | 765.8 | AL3NB_D022 (x(Nb) 0.25) + B2_BCC (x(Nb) 0.5547) + SIGMA_OLD (x(Nb) 0.63573) |
Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull AlNb-08Zhu · CALPHAD hull AlNb-09Wit · CALPHAD hull AlNb-15He · CALPHAD hull AlNb-97Ser-LB · CALPHAD hull AlNb-98Sau
Invariant reactions (literature)
| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---|---|---|---|---|---|---|
| 2336.15 | peritectic: L + (Nb) = Nb3Al | Nb3Al: Al 0.25, Nb 0.75 | experimental | [1] He 2015 cites Witusiewicz 2015 | Table 4, p. 7, row 3 report | |
| 2336 | L + β -> δ | δ: Al 0.25, Nb 0.75 | experimental | [2] Witusiewicz 2009 | Table 5, p. 10, row 2 report | |
| 2335.15 | peritectic: L + (Nb) = Nb3Al | L: Al 0.265; (Nb): Al 0.195; Nb3Al: Al 0.225 | model | [1] He 2015 cites Witusiewicz 2015 | Table 4, p. 7, row 5 report | |
| 2335 | other: L + β -> δ | L: Al 0.265; β: Al 0.195; δ: Al 0.225 | unspecified | [2] Witusiewicz 2009 | Table 5, p. 10, row 6 report | |
| 2334 | L + β -> δ | L: Al 0.282; β: Al 0.169; δ: Al 0.218 | model | [2] Witusiewicz 2009 cites Saunders 1998 | Table 5, p. 10, row 4 report | |
| 2333.7 | peritectic: Liquid + bcc-A2 -> AlNb3** | Liquid: Nb 0.718; bcc-A2: Nb 0.831; AlNb3**: Nb 0.782 | model | [3] (ed.) 1998 | Table I, p. 89, row 4 report | |
| 2333.15 | peritectic: L + (Nb) = Nb3Al | L: Al 0.28; (Nb): Al 0.215; Nb3Al: Al 0.225 | experimental | [1] He 2015 cites Jorda 1980 doi | Table 4, p. 7, row 2 report | |
| 2333.15 | peritectic: L + (Nb) = Nb3Al | L: Al 0.261; (Nb): Al 0.198; Nb3Al: Al 0.222 | model | [1] He 2015 cites Zhu 2008 doi | Table 4, p. 7, row 4 report | |
| 2333 | peritectic: L + β -> δ | L: Al 0.28; β: Al 0.215; δ: Al 0.225 | experimental | [2] Witusiewicz 2009 cites Massalski 1990 | Table 5, p. 10, row 1 report | |
| 2333 | L + β -> δ | L: Al 0.261; β: Al 0.198; δ: Al 0.222 | model | [2] Witusiewicz 2009 cites Zhu 2008 doi | Table 5, p. 10, row 5 report | |
| 2331.15 | peritectic: L + (Nb) = Nb3Al | L: Al 0.263; (Nb): Al 0.199; Nb3Al: Al 0.217 | model | [1] He 2015 | Table 4, p. 7, row 1 report | |
| 2324 | L + β -> δ | L: Al 0.288; β: Al 0.18; δ: Al 0.217 | model | [2] Witusiewicz 2009 cites Servant 1998 doi | Table 5, p. 10, row 3 report | |
| 2238 | L + δ -> σ | L: Al 0.353; δ: Al 0.228; σ: Al 0.317 | model | [2] Witusiewicz 2009 cites Saunders 1998 | Table 5, p. 10, row 10 report | |
| 2237.6 | peritectic: Liquid + AlNb3** -> σ | Liquid: Nb 0.647; AlNb3**: Nb 0.772; σ: Nb 0.683 | model | [3] (ed.) 1998 | Table I, p. 89, row 3 report | |
| 2213.15 | peritectic: L + Nb3Al = Nb2Al | L: Al 0.35; Nb3Al: Al 0.234; Nb2Al: Al 0.306 | model | [1] He 2015 | Table 4, p. 7, row 6 report | |
| 2213.15 | peritectic: L + Nb3Al = Nb2Al | L: Al 0.36; Nb3Al: Al 0.25; Nb2Al: Al 0.32 | experimental | [1] He 2015 cites Jorda 1980 doi | Table 4, p. 7, row 7 report | |
| 2213.15 | peritectic: L + Nb3Al = Nb2Al | L: Al 0.352; Nb3Al: Al 0.249; Nb2Al: Al 0.302 | model | [1] He 2015 cites Witusiewicz 2015 | Table 4, p. 7, row 10 report | |
| 2213 | peritectic: L + δ -> σ | L: Al 0.36; δ: Al 0.25; σ: Al 0.32 | experimental | [2] Witusiewicz 2009 cites Massalski 1990 | Table 5, p. 10, row 7 report | |
| 2213 | other: L + δ -> σ | L: Al 0.352; δ: Al 0.249; σ: Al 0.302 | unspecified | [2] Witusiewicz 2009 | Table 5, p. 10, row 12 report | |
| 2209.15 | peritectic: L + Nb3Al = Nb2Al | L: Al 0.349; Nb3Al: Al 0.238; Nb2Al: Al 0.311 | model | [1] He 2015 cites Zhu 2008 doi | Table 4, p. 7, row 9 report | |
| 2209 | L + δ -> σ | L: Al 0.349; δ: Al 0.238; σ: Al 0.311 | model | [2] Witusiewicz 2009 cites Zhu 2008 doi | Table 5, p. 10, row 11 report | |
| 2209 | L + δ -> σ | L: Al 0.368; δ: Al 0.254; σ: Al 0.306 | model | [2] Witusiewicz 2009 cites Servant 1998 doi | Table 5, p. 10, row 9 report | |
| 2208.15 | peritectic: L + Nb3Al = Nb2Al | Nb3Al: Al 0.25, Nb 0.75; Nb2Al: Al 0.333333, Nb 0.666667 | experimental | [1] He 2015 cites Witusiewicz 2015 | Table 4, p. 7, row 8 report | |
| 2208 | L + δ -> σ | δ: Al 0.25, Nb 0.75 | experimental | [2] Witusiewicz 2009 | Table 5, p. 10, row 8 report | |
| 2001.15 | congruent melting: L = NbAl3 | L: Al 0.749; NbAl3: Al 0.749 | model | [1] He 2015 | Table 4, p. 7, row 11 report | |
| 2000.15 | congruent melting: L = NbAl3 | L: Al 0.75, Nb 0.25; NbAl3: Al 0.75, Nb 0.25 | experimental | [1] He 2015 cites Stein 2014 doi | Table 4, p. 7, row 15 report | |
| 1994.15 | congruent melting: L = NbAl3 | L: Al 0.75, Nb 0.25; NbAl3: Al 0.75, Nb 0.25 | experimental | [1] He 2015 cites Witusiewicz 2015 | Table 4, p. 7, row 14 report | |
| 1988.15 | congruent melting: L = NbAl3 | L: Al 0.75, Nb 0.25; NbAl3: Al 0.75, Nb 0.25 | experimental | [1] He 2015 cites Witusiewicz 2015 | Table 4, p. 7, row 13 report | |
| 1987.15 | congruent melting: L = NbAl3 | L: Al 0.7486; NbAl3: Al 0.7486 | model | [1] He 2015 cites Witusiewicz 2015 | Table 4, p. 7, row 17 report | |
| 1987 | other: L -> ε | L: Al 0.7486; ε: Al 0.7486 | unspecified | [2] Witusiewicz 2009 | Table 5, p. 10, row 18 report | |
| 1986 | congruent melting: L -> ε | experimental | [2] Witusiewicz 2009 | Table 5, p. 10, row 14 report | ||
| 1968 | congruent melting: L -> ε | L: Al 0.7486; ε: Al 0.7486 | model | [2] Witusiewicz 2009 cites Servant 1998 doi | Table 5, p. 10, row 15 report | |
| 1961.15 | congruent melting: L = NbAl3 | L: Al 0.75; NbAl3: Al 0.75 | model | [1] He 2015 cites Zhu 2008 doi | Table 4, p. 7, row 16 report | |
| 1961 | congruent melting: L -> ε | L: Al 0.75; ε: Al 0.75 | model | [2] Witusiewicz 2009 cites Zhu 2008 doi | Table 5, p. 10, row 17 report | |
| 1956 | congruent melting: L -> ε | L: Al 0.75; ε: Al 0.75 | model | [2] Witusiewicz 2009 cites Saunders 1998 | Table 5, p. 10, row 16 report | |
| 1955.5 | congruent melting: Al3Nb* -> Liquid | Al3Nb*: Nb 0.25; Liquid: Nb 0.25 | model | [3] (ed.) 1998 | Table I, p. 89, row 5 report | |
| 1953.15 | congruent melting: L = NbAl3 | L: Al 0.75; NbAl3: Al 0.75 | experimental | [1] He 2015 cites Jorda 1980 doi | Table 4, p. 7, row 12 report | |
| 1953 | other: L -> ε | L: Al 0.75; ε: Al 0.75 | experimental | [2] Witusiewicz 2009 cites Massalski 1990 | Table 5, p. 10, row 13 report | |
| 1869 | eutectic: L -> ε + σ | L: Al 0.581; ε: Al 0.745; σ: Al 0.404 | model | [2] Witusiewicz 2009 cites Servant 1998 doi | Table 5, p. 10, row 21 report | |
| 1863.15 | eutectic: L = Nb2Al + NbAl3 | L: Al 0.55; Nb2Al: Al 0.42; NbAl3: Al 0.75, Nb 0.25 | experimental | [1] He 2015 cites Jorda 1980 doi | Table 4, p. 7, row 19 report | |
| 1863 | eutectic: L -> ε + σ | L: Al 0.55; σ: Al 0.42 | experimental | [2] Witusiewicz 2009 cites Massalski 1990 | Table 5, p. 10, row 19 report | |
| 1861.15 | eutectic: L = Nb2Al + NbAl3 | L: Al 0.58; Nb2Al: Al 0.333333, Nb 0.666667; NbAl3: Al 0.75, Nb 0.25 | model | [1] He 2015 cites Zhu 2008 doi | Table 4, p. 7, row 21 report | |
| 1861 | eutectic: L -> ε + σ | L: Al 0.58; ε: Al 0.75; σ: Al 0.406 | model | [2] Witusiewicz 2009 cites Zhu 2008 doi | Table 5, p. 10, row 23 report | |
| 1854.15 | eutectic: L = Nb2Al + NbAl3 | L: Al 0.564; Nb2Al: Al 0.406; NbAl3: Al 0.746 | model | [1] He 2015 | Table 4, p. 7, row 18 report | |
| 1845.15 | eutectic: L = Nb2Al + NbAl3 | Nb2Al: Al 0.406; NbAl3: Al 0.75, Nb 0.25 | experimental | [1] He 2015 cites Witusiewicz 2015 | Table 4, p. 7, row 20 report | |
| 1845 | eutectic: L -> ε + σ | experimental | [2] Witusiewicz 2009 | Table 5, p. 10, row 20 report | ||
| 1844.15 | eutectic: L = Nb2Al + NbAl3 | L: Al 0.562; Nb2Al: Al 0.386; NbAl3: Al 0.743 | model | [1] He 2015 cites Witusiewicz 2015 | Table 4, p. 7, row 22 report | |
| 1844 | other: L -> ε + σ | L: Al 0.562; ε: Al 0.743; σ: Al 0.386 | unspecified | [2] Witusiewicz 2009 | Table 5, p. 10, row 24 report | |
| 1832.1 | eutectic: Liquid -> Al3Nb* + σ | Liquid: Nb 0.412; Al3Nb*: Nb 0.25; σ: Nb 0.596 | model | [3] (ed.) 1998 | Table I, p. 89, row 2 report | |
| 1832 | eutectic: L -> ε + σ | L: Al 0.588; ε: Al 0.75; σ: Al 0.404 | model | [2] Witusiewicz 2009 cites Saunders 1998 | Table 5, p. 10, row 22 report | |
| 934.6 | peritectic: L + ε -> (αAl) | L: Al 0.9996; (αAl): Al 0.9994 | experimental | [2] Witusiewicz 2009 cites Massalski 1990 | Table 5, p. 10, row 26 report | |
| 934.6 | L + ε -> (αAl) | experimental | [2] Witusiewicz 2009 cites Zhu 2008 doi | Table 5, p. 10, row 28 report | ||
| 934.6 | L + ε -> (αAl) | experimental | [2] Witusiewicz 2009 cites Lundin 1966 | Table 5, p. 10, row 27 report | ||
| 934.59 | peritectic | experimental | [4] Zhu 2008 | p. 3 report | The degenerated equilibrium temperature is determined to be 661.44 ◦ C after the temperature calibration to pure Al is made. That temperature is higher by 1.1 K than the melting point of Al, showing a peritectic nature for the observed degenerated equilibrium. | |
| 934.55 | peritectic: L + NbAl3 = (Al) | NbAl3: Al 0.75, Nb 0.25; (Al): Al 0.9994 | experimental | [1] He 2015 cites Zhu 2008 doi | Table 4, p. 7, row 25 report | |
| 934.55 | peritectic: L + NbAl3 = (Al) | L: Al 0.9996; NbAl3: Al 0.75, Nb 0.25 | experimental | [1] He 2015 cites Shilo 1982 doi | Table 4, p. 7, row 24 report | |
| 934.5 | other: L + ε -> (αAl) | L: Al 0.99998; ε: Al 0.75; (αAl): Al 0.9985 | unspecified | [2] Witusiewicz 2009 | Table 5, p. 10, row 33 report | |
| 934.5 | L + ε -> (αAl) | L: Al 0.99999; ε: Al 0.75; (αAl): Al 0.9985 | model | [2] Witusiewicz 2009 cites Zhu 2008 doi | Table 5, p. 10, row 32 report | |
| 934.45 | peritectic: L + NbAl3 = (Al) | L: Al 0.99999; NbAl3: Al 0.75; (Al): Al 0.9985 | model | [1] He 2015 cites Zhu 2008 doi | Table 4, p. 7, row 27 report | |
| 934.45 | peritectic: L + NbAl3 = (Al) | L: Al 0.9999; NbAl3: Al 0.751; (Al): Al 0.9985 | model | [1] He 2015 | Table 4, p. 7, row 23 report | |
| 934.45 | peritectic: L + NbAl3 = (Al) | L: Al 0.99998; NbAl3: Al 0.75, Nb 0.25; (Al): Al 0.9985 | model | [1] He 2015 cites Witusiewicz 2015 | Table 4, p. 7, row 28 report | |
| 934.2 | peritectic: Liquid + Al3Nb* -> fcc-Al | Liquid: Nb 0; Al3Nb*: Nb 0.25; fcc-Al: Nb 0.001 | model | [3] (ed.) 1998 | Table I, p. 89, row 1 report | |
| 934.2 | L + ε -> (αAl) | L: Al 0.99999; ε: Al 0.75; (αAl): Al 0.999 | model | [2] Witusiewicz 2009 cites Servant 1998 doi | Table 5, p. 10, row 30 report | |
| 934.2 | L + ε -> (αAl) | L: Al 1; ε: Al 0.75; (αAl): Al 0.999 | model | [2] Witusiewicz 2009 cites Saunders 1998 | Table 5, p. 10, row 31 report | |
| 933 | eutectic: L -> (αAl) + ε | experimental | [2] Witusiewicz 2009 cites Baron 1961 | Table 5, p. 10, row 25 report | ||
| 930.15 | peritectic: L + NbAl3 = (Al) | NbAl3: Al 0.75 | experimental | [1] He 2015 cites Witusiewicz 2015 | Table 4, p. 7, row 26 report | |
| 930 | L + ε -> (αAl) | experimental | [2] Witusiewicz 2009 | Table 5, p. 10, row 29 report |
Other properties
Phase transition (9)
| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---|---|---|---|---|---|---|
| Phase transition | 1524 K | 1524 | congruent transformation: ␣2 ↔ 0 | model | [2] Witusiewicz 2009 | p. 14 report | As calculated, a congruent transformation ␣2 ↔ 0 occurs at 1524 K. |
| Phase transition | 1953.15 K | 1953.15 | NbAl3 | experimental | [1] He 2015 cites Jorda 1980 doi | p. 2 report | These values are much higher than the previously accepted one (1680 °C [16]). |
| Phase transition | 1987 K | 1987 | congruent transformation | model | [2] Witusiewicz 2009 | p. 10 report | Thus, in agreement with our own measurements and with the present thermodynamic description, the congruent melting temperature of NbAl3 amount to 1987 K. |
| Phase transition | 1987.15 K | 1987.15 | congruent transformation | experimental | [1] He 2015 cites Witusiewicz 2015 | p. 2 report | A noticeable information obtained experimentally by Witusiewicz et al. [8] is the congruent melting temperature of NbAl3 (1721 °C from DTA and 1714 °C from pyrometric measurement). |
| Phase transition | 1994.15 K | 1994.15 | congruent transformation | experimental | [1] He 2015 cites Witusiewicz 2015 | p. 2 report | A noticeable information obtained experimentally by Witusiewicz et al. [8] is the congruent melting temperature of NbAl3 (1721 °C from DTA and 1714 °C from pyrometric measurement). |
| Phase transition | 2000.15 K | 2000.15 | congruent transformation | experimental | [1] He 2015 cites Stein 2014 doi | p. 2 report | In a more recent paper [9] the congruent melting temperature of NbAl3 was re-investigated applying lower heating and cooling rates than in [8] (5 and 10 K/min instead of 20 K/min), giving a value of 1727 °C. |
| Phase transition | 2000.15 K | 2000.15 | congruent transformation | experimental | [1] He 2015 cites Stein 2014 doi | p. 8 report | It should be noted that the calculated congruent melting temperature of NbAl3 is 1728 °C, which perfectly fits the experimental value of 1727 °C [9], which in turn is much higher than reported in previous descriptions. |
| Phase transition | 2000.15 K | 2000.15 | congruent transformation | experimental | [1] He 2015 cites Stein 2014 doi | p. 1 report | In addition, according to the latest experimental data the congruent melting temperature of the intermetallic phase NbAl3 is 1727 °C [9], which is higher than the previously reported value. |
| Phase transition | 2001.15 K | 2001.15 | congruent transformation | model | [1] He 2015 | p. 8 report | It should be noted that the calculated congruent melting temperature of NbAl3 is 1728 °C, which perfectly fits the experimental value of 1727 °C [9], which in turn is much higher than reported in previous descriptions. |
Phase equilibrium (3)
| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---|---|---|---|---|---|---|
| Phase assemblage | 1473 | ␣ + ␥ alloy: Al 0.46, Nb 0.08 | experimental | [2] Witusiewicz 2009 | p. 6 report | Fig. 4c and d show the microstructure of sample no. 11 with about 46 at.% Al and 8 at.% Nb: after annealing for 2 h at 1633 K the sample displays single phase ␣-grains (Fig. 4c), whereas the double annealing 1633 K/2 h + 1473 K/15 h resulted in a lamellar two-phase structure composed of ␣ and ␥ (Fig. 4d). | |
| Phase assemblage | 1633 | ␣ alloy: Al 0.46, Nb 0.08 | experimental | [2] Witusiewicz 2009 | p. 6 report | Fig. 4c and d show the microstructure of sample no. 11 with about 46 at.% Al and 8 at.% Nb: after annealing for 2 h at 1633 K the sample displays single phase ␣-grains (Fig. 4c), whereas the double annealing 1633 K/2 h + 1473 K/15 h resulted in a lamellar two-phase structure composed of ␣ and ␥ (Fig. 4d). | |
| Phase assemblage | 1703 | ␣ +  alloy: Al 0.47, Nb 0.12 | experimental | [2] Witusiewicz 2009 | p. 5 report | The sample with 47 at.% Al and 12 at.% Nb displayed a small amount of -phase at 1703 K (see Fig. 3f) that significantly reduced the coarsening of ␣-grains. |
Heat capacity / entropy / enthalpy (2)
| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---|---|---|---|---|---|---|
| Entropy printed: entropy at constant volume | 93 J K 1 mol 1 | 298.15 | DFT | [5] Gebauer 2022 cites Online | p. 7 report | The entropy at constant volume of AlNbO4 is available in an online database for ab initio phonon calculations[36] and is 93.0 J K1 mol1 at 25 °C. | |
| Entropy printed: entropy at constant pressure | 90 J K 1 mol 1 | 298.15 | model | [5] Gebauer 2022 | p. 7 report | The entropy at constant pressure (calculated, this work) is 90.0 J K1 mol1 at 25 °C. |
Crystal structure (5)
| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---|---|---|---|---|---|---|
| Lattice a | 3.844 Å | 298.15 | Al3Nb alloy: Nb 0.25 | model | [6] Shao 2004 cites Villars 1991 | Table 1, p. 2, row 10 report | |
| Lattice a | 9.945 Å | 298.15 | Nb2Al (σ) alloy: Nb 0.666667 | model | [6] Shao 2004 cites Villars 1991 | Table 1, p. 2, row 8 report | |
| Lattice a | 5.186 Å | 298.15 | Nb3Al alloy: Nb 0.75 | model | [6] Shao 2004 cites Villars 1991 | Table 1, p. 2, row 9 report | |
| Lattice c | 8.605 Å | 298.15 | Al3Nb alloy: Nb 0.25 | model | [6] Shao 2004 cites Villars 1991 | Table 1, p. 2, row 10 report | |
| Lattice c | 5.171 Å | 298.15 | Nb2Al (σ) alloy: Nb 0.666667 | model | [6] Shao 2004 cites Villars 1991 | 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).
- Cuiyun He, Frank Stein, Martin Palm, Thermodynamic description of the systems Co–Nb, Al–Nb and Co–Al–Nb, Journal of Alloys and Compounds 637, 361-375 (2015). doi:10.1016/j.jallcom.2015.02.182
- V.T. Witusiewicz, A.A. Bondar, U. Hecht, T.Ya. Velikanova, The Al–B–Nb–Ti system, Journal of Alloys and Compounds 472, 133-161 (2009). doi:10.1016/j.jallcom.2008.05.008
- 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.
- Zhijun Zhu, Yong Du, Lijun Zhang, Hailin Chen, Honghui Xu, Chengying Tang, Experimental identification of the degenerated equilibrium and thermodynamic modeling in the Al–Nb system, Journal of Alloys and Compounds 460, 632-638 (2008). doi:10.1016/j.jallcom.2007.06.033
- Julian Gebauer, Peter Franke, Hans Jürgen Seifert, Thermodynamic Evaluation of the system Ta–O and Preliminary Assessment of the Systems Al–Nb–O and Al–Ta–O, Adv Eng Mater 24 (2022). doi:10.1002/adem.202200162
- G. Shao, Thermodynamic assessment of the Nb–Si–Al system, Intermetallics 12, 655-664 (2004). doi:10.1016/j.intermet.2004.03.011