# Fe–Ni–Ta system

> Fe–Ni–Ta system: 67 accepted literature values (phase equilibrium 53, mixing / partial 9, invariant reaction 5) and 0 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

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67 accepted literature values from 2 paper(s) (experimental 62, model 5); 0 calculated phase diagram(s).

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Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 62 |
| model | 5 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 5 |
| phase equilibrium | 53 |
| mixing / partial | 9 |

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Fe–Ni–Ta system (5)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1920.15 | quasi-peritectic: liquid + bcc(Ta) -> NiTa2 + (Fe,Ni)7Ta6 | liquid: Fe 0.1413, Ni 0.2723, Ta 0.5864; bcc(Ta): Fe 0.0312, Ni 0.09, Ta 0.8788; NiTa2: Fe 0.0672, Ni 0.2526, Ta 0.6802; (Fe,Ni)7Ta6: Fe 0.143, Ni 0.2407, Ta 0.6163; L: Fe 0.1413, Ni 0.2723, Ta 0.5864 | model | [1] Yang 2020 | Table 6, p. 18, row 1; `ORC-AUWNZTKXIZ` |  |
| 1691.15 | quasi-peritectic: liquid + bcc(Fe) -> Fe2Ta + fcc(Fe,Ni) | liquid: Fe 0.858, Ni 0.0748, Ta 0.0672; bcc(Fe): Fe 0.9276, Ni 0.0474, Ta 0.025; Fe2Ta: Fe 0.6311, Ni 0.0728, Ta 0.2961; fcc(Fe,Ni): Fe 0.9327, Ni 0.0519, Ta 0.0154; L: Fe 0.858, Ni 0.0748, Ta 0.0672 | model | [1] Yang 2020 | Table 6, p. 18, row 2; `ORC-2UK6RRBPQX` |  |
| 1619.15 | eutectic: liquid -> Ni2Ta + Fe2Ta + Ni3Ta | liquid: Fe 0.0958, Ni 0.5794, Ta 0.3248; Ni2Ta: Fe 0.0391, Ni 0.6215, Ta 0.3394; Fe2Ta: Fe 0.2787, Ni 0.3891, Ta 0.3322; Ni3Ta: Fe 0.0517, Ni 0.6927, Ta 0.2556; L: Fe 0.0958, Ni 0.5794, Ta 0.3248 | model | [1] Yang 2020 | Table 6, p. 18, row 3; `ORC-JZEIFRSMFW` |  |
| 1612.15 | eutectic: liquid -> Ni2Ta + (Fe,Ni)7Ta6 + Fe2Ta | liquid: Fe 0.0824, Ni 0.5415, Ta 0.3761; Ni2Ta: Fe 0.0384, Ni 0.6068, Ta 0.3548; (Fe,Ni)7Ta6: Fe 0.1121, Ni 0.4009, Ta 0.487; Fe2Ta: Fe 0.2811, Ni 0.3844, Ta 0.3345; L: Fe 0.0824, Ni 0.5415, Ta 0.3761 | model | [1] Yang 2020 | Table 6, p. 18, row 4; `ORC-3YYI24CRU7` |  |
| 1480.15 | eutectic: liquid -> Ni3Ta + fcc(Fe,Ni) + Fe2Ta | liquid: Fe 0.3334, Ni 0.5131, Ta 0.1535; Ni3Ta: Fe 0.1131, Ni 0.6404, Ta 0.2465; fcc(Fe,Ni): Fe 0.3953, Ni 0.509, Ta 0.0957; Fe2Ta: Fe 0.3504, Ni 0.345, Ta 0.3046; L: Fe 0.3334, Ni 0.5131, Ta 0.1535 | model | [1] Yang 2020 | Table 6, p. 18, row 5; `ORC-KGR3YUWO7V` |  |

## Other properties

### Phase equilibrium (53)

Table: Phase equilibrium, Fe–Ni–Ta system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase assemblage |  |  | Ni2Ta + (Fe,Ni)7Ta6; _alloy: Fe 0.053, Ni 0.554, Ta 0.393_ | experimental | [1] Yang 2020 | Table 2, p. 4, row 14; `ORC-HWW7YCFGMH` |  |
| Phase assemblage |  |  | bcc(Fe) + Fe2Ta; _alloy: Fe 0.904, Ni 0.029, Ta 0.067_ | experimental | [1] Yang 2020 | Table 2, p. 4, row 4; `ORC-VO23S3IWOS` |  |
| Phase composition |  |  | (Fe,Ni)7Ta6; _(Fe,Ni)7Ta6: Fe 0.062, Ni 0.388, Ta 0.55_ | experimental | [1] Yang 2020 | Table 2, p. 4, row 16; `ORC-2XL6PXHOWY` |  |
| Phase composition |  |  | (Fe,Ni)7Ta6; _(Fe,Ni)7Ta6: Fe 0.114, Ni 0.354, Ta 0.532_ | experimental | [1] Yang 2020 | Table 2, p. 4, row 15; `ORC-7RXKTQ53QV` |  |
| Phase composition |  |  | (Fe,Ni)7Ta6; _(Fe,Ni)7Ta6: Fe 0.373, Ni 0.076, Ta 0.551_ | experimental | [1] Yang 2020 | Table 2, p. 4, row 18; `ORC-HBO2M3H6XZ` |  |
| Phase composition |  |  | (Fe,Ni)7Ta6; _(Fe,Ni)7Ta6: Fe 0.235, Ni 0.177, Ta 0.588_ | experimental | [1] Yang 2020 | Table 2, p. 4, row 17; `ORC-NODIFR2TNT` |  |
| Phase composition |  |  | Fe2Ta; _Fe2Ta: Fe 0.311, Ni 0.249, Ta 0.44_ | experimental | [1] Yang 2020 | Table 2, p. 4, row 9; `ORC-3RNP5TIXTD` |  |
| Phase composition |  |  | Fe2Ta; _Fe2Ta: Fe 0.462, Ni 0.137, Ta 0.401_ | experimental | [1] Yang 2020 | Table 2, p. 4, row 11; `ORC-CZSOFLEEPH` |  |
| Phase composition |  |  | Fe2Ta; _Fe2Ta: Fe 0.165, Ni 0.476, Ta 0.359_ | experimental | [1] Yang 2020 | Table 2, p. 4, row 10; `ORC-KO7NBEZ3JL` |  |
| Phase composition |  |  | Fe2Ta; _Fe2Ta: Fe 0.45, Ni 0.246, Ta 0.304_ | experimental | [1] Yang 2020 | Table 2, p. 4, row 8; `ORC-YHN7RGEPYH` |  |
| Phase composition |  |  | Ni2Ta; _Ni2Ta: Fe 0.01, Ni 0.661, Ta 0.329_ | experimental | [1] Yang 2020 | Table 2, p. 4, row 13; `ORC-76QT7ZS547` |  |
| Phase composition |  |  | Ni2Ta; _Ni2Ta: Fe 0.022, Ni 0.635, Ta 0.343_ | experimental | [1] Yang 2020 | Table 2, p. 4, row 12; `ORC-KPW3ABUZHB` |  |
| Phase composition |  |  | Ni3Ta; _Ni3Ta: Fe 0.15, Ni 0.587, Ta 0.263_ | experimental | [1] Yang 2020 | Table 2, p. 4, row 7; `ORC-5NCKKI2VQN` |  |
| Phase composition |  |  | Ni3Ta; _Ni3Ta: Fe 0.029, Ni 0.709, Ta 0.262_ | experimental | [1] Yang 2020 | Table 2, p. 4, row 6; `ORC-CVJVL32PQO` |  |
| Phase composition |  |  | Ni3Ta; _Ni3Ta: Fe 0.065, Ni 0.741, Ta 0.194_ | experimental | [1] Yang 2020 | Table 2, p. 4, row 5; `ORC-DNZ7T4BOLU` |  |
| Phase composition |  |  | NiTa2; _NiTa2: Fe 0.116, Ni 0.306, Ta 0.578_ | experimental | [1] Yang 2020 | Table 2, p. 4, row 20; `ORC-LCBI2XP52L` |  |
| Phase composition |  |  | NiTa2; _NiTa2: Fe 0.052, Ni 0.351, Ta 0.597_ | experimental | [1] Yang 2020 | Table 2, p. 4, row 19; `ORC-N5XOJS6UZ4` |  |
| Phase composition |  |  | bcc(Fe); _bcc(Fe): Fe 0.951, Ni 0.033, Ta 0.016_ | experimental | [1] Yang 2020 | Table 2, p. 4, row 1; `ORC-TOW2W2O2DR` |  |
| Phase composition |  |  | bcc(Ta); _bcc(Ta): Fe 0.091, Ni 0.016, Ta 0.893_ | experimental | [1] Yang 2020 | Table 2, p. 4, row 21; `ORC-VTPVL4AGCU` |  |
| Phase composition |  |  | fcc(Fe,Ni); _fcc(Fe,Ni): Fe 0.171, Ni 0.753, Ta 0.076_ | experimental | [1] Yang 2020 | Table 2, p. 4, row 3; `ORC-4C7J4GHFTH` |  |
| Phase composition |  |  | fcc(Fe,Ni); _fcc(Fe,Ni): Fe 0.651, Ni 0.307, Ta 0.042_ | experimental | [1] Yang 2020 | Table 2, p. 4, row 2; `ORC-NLGRYNES4A` |  |
| Phase composition |  | 1273.15 | (Fe,Ni)7Ta6 + NiTa2 + (Fe,Ni)₇Ta₆ + NiTa₂; _(Fe,Ni)7Ta6: Fe 0.165, Ni 0.281, Ta 0.554; NiTa2: Fe 0.06, Ni 0.273, Ta 0.667; (Fe,Ni)₇Ta₆: Fe 0.165, Ni 0.281, Ta 0.554; NiTa₂: Fe 0.06, Ni 0.273, Ta 0.667_ | experimental | [1] Yang 2020 | Table 4, p. 12, row 7; `ORC-DS2ZILRZIW` |  |
| Phase composition |  | 1273.15 | (Fe,Ni)7Ta6 + bcc(Ta) + (Fe,Ni)₇Ta₆; _(Fe,Ni)7Ta6: Fe 0.318, Ni 0.122, Ta 0.56; bcc(Ta): Fe 0.097, Ni 0.034, Ta 0.869; (Fe,Ni)₇Ta₆: Fe 0.318, Ni 0.122, Ta 0.56_ | experimental | [1] Yang 2020 | Table 4, p. 12, row 6; `ORC-46DCTKHGUR` |  |
| Phase composition |  | 1273.15 | (Fe,Ni)7Ta6 + bcc(Ta) + (Fe,Ni)₇Ta₆; _(Fe,Ni)7Ta6: Fe 0.369, Ni 0.066, Ta 0.565; bcc(Ta): Fe 0.064, Ni 0.006, Ta 0.93; (Fe,Ni)₇Ta₆: Fe 0.369, Ni 0.066, Ta 0.565_ | experimental | [1] Yang 2020 | Table 4, p. 12, row 5; `ORC-SR2OUOSWPH` |  |
| Phase composition |  | 1273.15 | Fe2Ta + (Fe,Ni)7Ta6 + Fe₂Ta + (Fe,Ni)₇Ta₆; _Fe2Ta: Fe 0.35, Ni 0.305, Ta 0.345; (Fe,Ni)7Ta6: Fe 0.233, Ni 0.3, Ta 0.467; Fe₂Ta: Fe 0.35, Ni 0.305, Ta 0.345; (Fe,Ni)₇Ta₆: Fe 0.233, Ni 0.3, Ta 0.467_ | experimental | [1] Yang 2020 | Table 4, p. 12, row 4; `ORC-542SZM5VJF` |  |
| Phase composition |  | 1273.15 | Fe2Ta + (Fe,Ni)7Ta6 + Fe₂Ta + (Fe,Ni)₇Ta₆; _Fe2Ta: Fe 0.426, Ni 0.229, Ta 0.345; (Fe,Ni)7Ta6: Fe 0.303, Ni 0.235, Ta 0.462; Fe₂Ta: Fe 0.426, Ni 0.229, Ta 0.345; (Fe,Ni)₇Ta₆: Fe 0.303, Ni 0.235, Ta 0.462_ | experimental | [1] Yang 2020 | Table 4, p. 12, row 3; `ORC-FOCYKIVB5G` |  |
| Phase composition |  | 1273.15 | Ni2Ta + (Fe,Ni)7Ta6 + Fe2Ta + Ni₂Ta + (Fe,Ni)₇Ta₆ + Fe₂Ta; _Ni2Ta: Fe 0.026, Ni 0.636, Ta 0.338; (Fe,Ni)7Ta6: Fe 0.178, Ni 0.36, Ta 0.462; Fe2Ta: Fe 0.313, Ni 0.355, Ta 0.332; Ni₂Ta: Fe 0.026, Ni 0.636, Ta 0.338; (Fe,Ni)₇Ta₆: Fe 0.178, Ni 0.36, Ta 0.462; Fe₂Ta: Fe 0.313, Ni 0.355, Ta 0.332_ | experimental | [1] Yang 2020 | Table 4, p. 12, row 14; `ORC-M6W2KBZ756` |  |
| Phase composition |  | 1273.15 | Ni3Ta + Ni2Ta + Ni₃Ta + Ni₂Ta; _Ni3Ta: Fe 0.029, Ni 0.716, Ta 0.255; Ni2Ta: Fe 0.028, Ni 0.641, Ta 0.331; Ni₃Ta: Fe 0.029, Ni 0.716, Ta 0.255; Ni₂Ta: Fe 0.028, Ni 0.641, Ta 0.331_ | experimental | [1] Yang 2020 | Table 4, p. 12, row 8; `ORC-BBVHPIE3OC` |  |
| Phase composition |  | 1273.15 | Ni3Ta + fcc(Fe,Ni) + Fe2Ta + Ni₃Ta + Fe₂Ta; _Ni3Ta: Fe 0.074, Ni 0.675, Ta 0.251; fcc(Fe,Ni): Fe 0.48, Ni 0.445, Ta 0.075; Fe2Ta: Fe 0.42, Ni 0.289, Ta 0.291; Ni₃Ta: Fe 0.074, Ni 0.675, Ta 0.251; Fe₂Ta: Fe 0.42, Ni 0.289, Ta 0.291_ | experimental | [1] Yang 2020 | Table 4, p. 12, row 13; `ORC-QGSJFIQAEQ` |  |
| Phase composition |  | 1273.15 | Ni3Ta + fcc(Fe,Ni) + Ni₃Ta; _Ni3Ta: Fe 0.044, Ni 0.726, Ta 0.23; fcc(Fe,Ni): Fe 0.309, Ni 0.629, Ta 0.062; Ni₃Ta: Fe 0.044, Ni 0.726, Ta 0.23_ | experimental | [1] Yang 2020 | Table 4, p. 12, row 12; `ORC-T5E65S6KTM` |  |
| Phase composition |  | 1273.15 | NiTa2 + (Fe,Ni)7Ta6 + bcc(Ta) + NiTa₂ + (Fe,Ni)₇Ta₆; _NiTa2: Fe 0.098, Ni 0.238, Ta 0.664; (Fe,Ni)7Ta6: Fe 0.255, Ni 0.177, Ta 0.568; bcc(Ta): Fe 0.048, Ni 0.04, Ta 0.912; NiTa₂: Fe 0.098, Ni 0.238, Ta 0.664; (Fe,Ni)₇Ta₆: Fe 0.255, Ni 0.177, Ta 0.568_ | experimental | [1] Yang 2020 | Table 4, p. 12, row 15; `ORC-ZZRGIS63BO` |  |
| Phase composition |  | 1273.15 | NiTa2 + bcc(Ta) + NiTa₂; _NiTa2: Fe 0.092, Ni 0.243, Ta 0.665; bcc(Ta): Fe 0.02, Ni 0.023, Ta 0.957; NiTa₂: Fe 0.092, Ni 0.243, Ta 0.665_ | experimental | [1] Yang 2020 | Table 4, p. 12, row 10; `ORC-4TILYZDRDR` |  |
| Phase composition |  | 1273.15 | bcc(Ta) + NiTa2 + NiTa₂; _bcc(Ta): Fe 0.011, Ni 0.022, Ta 0.967; NiTa2: Fe 0.074, Ni 0.272, Ta 0.654; NiTa₂: Fe 0.074, Ni 0.272, Ta 0.654_ | experimental | [1] Yang 2020 | Table 4, p. 12, row 9; `ORC-S3BBOUGAIC` |  |
| Phase composition |  | 1273.15 | fcc(Fe,Ni) + Fe2Ta + Fe₂Ta; _fcc(Fe,Ni): Fe 0.707, Ni 0.27, Ta 0.023; Fe2Ta: Fe 0.545, Ni 0.147, Ta 0.308; Fe₂Ta: Fe 0.545, Ni 0.147, Ta 0.308_ | experimental | [1] Yang 2020 | Table 4, p. 12, row 1; `ORC-PDTXF3M7RN` |  |
| Phase composition |  | 1273.15 | fcc(Fe,Ni) + Fe2Ta + Fe₂Ta; _fcc(Fe,Ni): Fe 0.584, Ni 0.352, Ta 0.064; Fe2Ta: Fe 0.491, Ni 0.223, Ta 0.286; Fe₂Ta: Fe 0.491, Ni 0.223, Ta 0.286_ | experimental | [1] Yang 2020 | Table 4, p. 12, row 2; `ORC-PWBPJQT24W` |  |
| Phase composition |  | 1273.15 | fcc(Fe,Ni) + Ni3Ta + Ni₃Ta; _fcc(Fe,Ni): Fe 0.09, Ni 0.815, Ta 0.095; Ni3Ta: Fe 0.021, Ni 0.746, Ta 0.233; Ni₃Ta: Fe 0.021, Ni 0.746, Ta 0.233_ | experimental | [1] Yang 2020 | Table 4, p. 12, row 11; `ORC-O4ZU2IYDZ6` |  |
| Phase composition |  | 1473.15 | (Fe,Ni)7Ta6 + Fe2Ta + (Fe,Ni)₇Ta₆ + Fe₂Ta; _(Fe,Ni)7Ta6: Fe 0.184, Ni 0.348, Ta 0.468; Fe2Ta: Fe 0.289, Ni 0.347, Ta 0.364; (Fe,Ni)₇Ta₆: Fe 0.184, Ni 0.348, Ta 0.468; Fe₂Ta: Fe 0.289, Ni 0.347, Ta 0.364_ | experimental | [1] Yang 2020 | Table 3, p. 11, row 9; `ORC-UG533LJQF2` |  |
| Phase composition |  | 1473.15 | (Fe,Ni)7Ta6 + Fe2Ta + Ni2Ta + (Fe,Ni)₇Ta₆ + Fe₂Ta + Ni₂Ta; _(Fe,Ni)7Ta6: Fe 0.148, Ni 0.398, Ta 0.454; Fe2Ta: Fe 0.287, Ni 0.378, Ta 0.335; Ni2Ta: Fe 0.043, Ni 0.612, Ta 0.345; (Fe,Ni)₇Ta₆: Fe 0.148, Ni 0.398, Ta 0.454; Fe₂Ta: Fe 0.287, Ni 0.378, Ta 0.335; Ni₂Ta: Fe 0.043, Ni 0.612, Ta 0.345_ | experimental | [1] Yang 2020 | Table 3, p. 11, row 16; `ORC-MSEQ3KCFST` |  |
| Phase composition |  | 1473.15 | (Fe,Ni)7Ta6 + Ni2Ta + (Fe,Ni)₇Ta₆ + Ni₂Ta; _(Fe,Ni)7Ta6: Fe 0.1, Ni 0.33, Ta 0.57; Ni2Ta: Fe 0.072, Ni 0.276, Ta 0.652; (Fe,Ni)₇Ta₆: Fe 0.1, Ni 0.33, Ta 0.57; Ni₂Ta: Fe 0.072, Ni 0.276, Ta 0.652_ | experimental | [1] Yang 2020 | Table 3, p. 11, row 11; `ORC-7XNR3XZJ2U` |  |
| Phase composition |  | 1473.15 | (Fe,Ni)7Ta6 + bcc(Ta) + (Fe,Ni)₇Ta₆; _(Fe,Ni)7Ta6: Fe 0.301, Ni 0.11, Ta 0.589; bcc(Ta): Fe 0.041, Ni 0.01, Ta 0.949; (Fe,Ni)₇Ta₆: Fe 0.301, Ni 0.11, Ta 0.589_ | experimental | [1] Yang 2020 | Table 3, p. 11, row 12; `ORC-7EJK3CEUHT` |  |
| Phase composition |  | 1473.15 | Fe2Ta + (Fe,Ni)7Ta6 + Fe₂Ta + (Fe,Ni)₇Ta₆; _Fe2Ta: Fe 0.344, Ni 0.301, Ta 0.355; (Fe,Ni)7Ta6: Fe 0.225, Ni 0.329, Ta 0.446; Fe₂Ta: Fe 0.344, Ni 0.301, Ta 0.355; (Fe,Ni)₇Ta₆: Fe 0.225, Ni 0.329, Ta 0.446_ | experimental | [1] Yang 2020 | Table 3, p. 11, row 8; `ORC-FE4QUXFOZH` |  |
| Phase composition |  | 1473.15 | Fe2Ta + (Fe,Ni)7Ta6 + Fe₂Ta + (Fe,Ni)₇Ta₆; _Fe2Ta: Fe 0.46, Ni 0.192, Ta 0.348; (Fe,Ni)7Ta6: Fe 0.312, Ni 0.22, Ta 0.468; Fe₂Ta: Fe 0.46, Ni 0.192, Ta 0.348; (Fe,Ni)₇Ta₆: Fe 0.312, Ni 0.22, Ta 0.468_ | experimental | [1] Yang 2020 | Table 3, p. 11, row 10; `ORC-OOWYCAH7UN` |  |
| Phase composition |  | 1473.15 | Ni2Ta + (Fe,Ni)7Ta6 + Ni₂Ta + (Fe,Ni)₇Ta₆; _Ni2Ta: Fe 0.015, Ni 0.652, Ta 0.333; (Fe,Ni)7Ta6: Fe 0.117, Ni 0.406, Ta 0.477; Ni₂Ta: Fe 0.015, Ni 0.652, Ta 0.333; (Fe,Ni)₇Ta₆: Fe 0.117, Ni 0.406, Ta 0.477_ | experimental | [1] Yang 2020 | Table 3, p. 11, row 7; `ORC-D55CGWRPGG` |  |
| Phase composition |  | 1473.15 | Ni3Ta + Fe2Ta + fcc(Fe,Ni) + Ni₃Ta + Fe₂Ta; _Ni3Ta: Fe 0.096, Ni 0.66, Ta 0.244; Fe2Ta: Fe 0.355, Ni 0.353, Ta 0.292; fcc(Fe,Ni): Fe 0.395, Ni 0.513, Ta 0.092; Ni₃Ta: Fe 0.096, Ni 0.66, Ta 0.244; Fe₂Ta: Fe 0.355, Ni 0.353, Ta 0.292_ | experimental | [1] Yang 2020 | Table 3, p. 11, row 15; `ORC-TQY3TSF5N7` |  |
| Phase composition |  | 1473.15 | Ni3Ta + Ni2Ta + Ni₃Ta + Ni₂Ta; _Ni3Ta: Fe 0.024, Ni 0.731, Ta 0.245; Ni2Ta: Fe 0.028, Ni 0.661, Ta 0.311; Ni₃Ta: Fe 0.024, Ni 0.731, Ta 0.245; Ni₂Ta: Fe 0.028, Ni 0.661, Ta 0.311_ | experimental | [1] Yang 2020 | Table 3, p. 11, row 6; `ORC-FLKJ4WJO6X` |  |
| Phase composition |  | 1473.15 | Ni3Ta + fcc(Fe,Ni) + Ni₃Ta; _Ni3Ta: Fe 0.053, Ni 0.71, Ta 0.237; fcc(Fe,Ni): Fe 0.287, Ni 0.633, Ta 0.08; Ni₃Ta: Fe 0.053, Ni 0.71, Ta 0.237_ | experimental | [1] Yang 2020 | Table 3, p. 11, row 4; `ORC-FC4QJIJ3MO` |  |
| Phase composition |  | 1473.15 | NiTa2 + (Fe,Ni)7Ta6 + bcc(Ta) + NiTa₂ + (Fe,Ni)₇Ta₆; _NiTa2: Fe 0.112, Ni 0.217, Ta 0.671; (Fe,Ni)7Ta6: Fe 0.206, Ni 0.213, Ta 0.581; bcc(Ta): Fe 0.051, Ni 0.034, Ta 0.915; NiTa₂: Fe 0.112, Ni 0.217, Ta 0.671; (Fe,Ni)₇Ta₆: Fe 0.206, Ni 0.213, Ta 0.581_ | experimental | [1] Yang 2020 | Table 3, p. 11, row 17; `ORC-HJY3U3G36R` |  |
| Phase composition |  | 1473.15 | NiTa2 + bcc(Ta) + NiTa₂; _NiTa2: Fe 0.071, Ni 0.253, Ta 0.676; bcc(Ta): Fe 0.016, Ni 0.036, Ta 0.948; NiTa₂: Fe 0.071, Ni 0.253, Ta 0.676_ | experimental | [1] Yang 2020 | Table 3, p. 11, row 14; `ORC-5DITJGFJHA` |  |
| Phase composition |  | 1473.15 | bcc(Ta) + (Fe,Ni)7Ta6 + (Fe,Ni)₇Ta₆; _bcc(Ta): Fe 0.04, Ni 0.01, Ta 0.95; (Fe,Ni)7Ta6: Fe 0.28, Ni 0.163, Ta 0.557; (Fe,Ni)₇Ta₆: Fe 0.28, Ni 0.163, Ta 0.557_ | experimental | [1] Yang 2020 | Table 3, p. 11, row 13; `ORC-SAX2YZWG4L` |  |
| Phase composition |  | 1473.15 | fcc(Fe,Ni) + Fe2Ta + Fe₂Ta; _fcc(Fe,Ni): Fe 0.445, Ni 0.461, Ta 0.094; Fe2Ta: Fe 0.399, Ni 0.302, Ta 0.299; Fe₂Ta: Fe 0.399, Ni 0.302, Ta 0.299_ | experimental | [1] Yang 2020 | Table 3, p. 11, row 3; `ORC-GTYYOEAVXG` |  |
| Phase composition |  | 1473.15 | fcc(Fe,Ni) + Fe2Ta + Fe₂Ta; _fcc(Fe,Ni): Fe 0.571, Ni 0.364, Ta 0.065; Fe2Ta: Fe 0.482, Ni 0.224, Ta 0.294; Fe₂Ta: Fe 0.482, Ni 0.224, Ta 0.294_ | experimental | [1] Yang 2020 | Table 3, p. 11, row 2; `ORC-T7NMHNP3TJ` |  |
| Phase composition |  | 1473.15 | fcc(Fe,Ni) + Fe2Ta + Fe₂Ta; _fcc(Fe,Ni): Fe 0.562, Ni 0.15, Ta 0.288; Fe2Ta: Fe 0.706, Ni 0.265, Ta 0.029; Fe₂Ta: Fe 0.706, Ni 0.265, Ta 0.029_ | experimental | [1] Yang 2020 | Table 3, p. 11, row 1; `ORC-TXJIT3DCMK` |  |
| Phase composition |  | 1473.15 | fcc(Fe,Ni) + Ni3Ta + Ni₃Ta; _fcc(Fe,Ni): Fe 0.088, Ni 0.81, Ta 0.102; Ni3Ta: Fe 0.024, Ni 0.74, Ta 0.236; Ni₃Ta: Fe 0.024, Ni 0.74, Ta 0.236_ | experimental | [1] Yang 2020 | Table 3, p. 11, row 5; `ORC-MG2RNJGJN7` |  |

### Mixing / partial (9)

Table: Mixing / partial, Fe–Ni–Ta system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Partial enthalpy; _printed: ΔdissH0 (partial molar enthalpy of dissolution)_ | 42.3 unknown ± 1.4 | 1773 | Fe; _alloy: Fe 1_ | experimental | [2] Witusiewicz 2011 | Table 4, p. 10, row 2; `ORC-QBOTFZWBG7.805c17` |  |
| Partial enthalpy; _printed: ΔdissH0 (partial molar enthalpy of dissolution)_ | -37.2 unknown ± 1.9 | 1773 | Fe0.359Ta0.641; _alloy: Fe 0.359, Ni 0, Ta 0.641_ | experimental | [2] Witusiewicz 2011 | Table 4, p. 10, row 7; `ORC-RBIUGBH6AP.ac4d00` |  |
| Partial enthalpy; _printed: ΔdissH0 (partial molar enthalpy of dissolution)_ | -20.2 unknown ± 1.1 | 1773 | Fe0.477Ta0.523; _alloy: Fe 0.477, Ni 0, Ta 0.523_ | experimental | [2] Witusiewicz 2011 | Table 4, p. 10, row 6; `ORC-QZSSUKPVHP.408fb7` |  |
| Partial enthalpy; _printed: ΔdissH0 (partial molar enthalpy of dissolution)_ | -0.5 unknown ± 1.2 | 1773 | Fe0.638Ta0.362; _alloy: Fe 0.638, Ni 0, Ta 0.362_ | experimental | [2] Witusiewicz 2011 | Table 4, p. 10, row 5; `ORC-ZX3SPCCEO7.d17921` |  |
| Partial enthalpy; _printed: ΔdissH0 (partial molar enthalpy of dissolution)_ | 5.1 unknown ± 1.5 | 1773 | Fe0.678Ta0.322; _alloy: Fe 0.678, Ni 0, Ta 0.322_ | experimental | [2] Witusiewicz 2011 | Table 4, p. 10, row 4; `ORC-MNHCCD4UUO.ac8ada` |  |
| Partial enthalpy; _printed: ΔdissH0 (partial molar enthalpy of dissolution)_ | 24.1 unknown ± 1.4 | 1773 | Fe0.844Ta0.156; _alloy: Fe 0.844, Ni 0, Ta 0.156_ | experimental | [2] Witusiewicz 2011 | Table 4, p. 10, row 3; `ORC-L7LSQ45SMI.37dbcf` |  |
| Partial enthalpy; _printed: ΔdissH0 (partial molar enthalpy of dissolution)_ | 66.4 unknown ± 0.7 | 1773 | Ni; _alloy: Ni 1, Ta 0_ | experimental | [2] Witusiewicz 2011 | Table 4, p. 10, row 1; `ORC-EFKFL7YRVV.1dd8e4` |  |
| Partial enthalpy; _printed: ΔdissH0_ | 66.87 unknown | 1773 | Ni; _alloy: Ni 1, Ta 0_ | experimental | [2] Witusiewicz 2011; _cites SGTE 2011_ | Table 4, p. 10, row 9; `ORC-YH3XX7UGEI.73eecd` |  |
| Partial enthalpy; _printed: ΔdissH0 (partial molar enthalpy of dissolution)_ | -90.8 unknown ± 1.2 | 1773 | Ta; _alloy: Ta 1_ | experimental | [2] Witusiewicz 2011 | Table 4, p. 10, row 8; `ORC-4BSOU4T3BM.a0f731` |  |

## Sources

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

1. Bo Yang, Cuiping Guo, Changrong Li, Zhenmin Du, Experimental Investigation and Thermodynamic Modelling of the Fe-Ni-Ta System, J. Phase Equilib. Diffus. 41, 500-521 (2020). [doi:10.1007/s11669-020-00807-3](https://doi.org/10.1007/s11669-020-00807-3)
2. V.T. Witusiewicz, A.A. Bondar, U. Hecht, V.M. Voblikov, O.S. Fomichov, V.M. Petyukh et al., Experimental study and thermodynamic re-assessment of the binary Fe–Ta system, Intermetallics 19, 1059-1075 (2011). [doi:10.1016/j.intermet.2011.03.018](https://doi.org/10.1016/j.intermet.2011.03.018)

## 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 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_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/).