Фазовая диаграмма системы Ni-Ta

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Ni-Ta (Nickel-Tantalum) A. Nash and P. Nash The Ni-Ta diagram is based primarily on the work of [33The], [49Kub], [53Kor], [62Kor], [77Pim], and [83Nas]. There is full agreement on the reactions that produce all of the compounds except Ni8Ta. By means of diffusion couples and microprobe analysis, [77Pim] established the solubility limits for all five intermediate phases, which varied between 2 and 4 at.% in the temperature range of 1150 to 1340 C. The solubility of Ta in ( Ni) is uncertain and thus is shown as a dotted line. A splat-cooling technique was used to prepare alloys containing 15 to 25 at.% Ta [67Ruh]. The cooling rates varied from 105 to 107 C/s at the melting point. Four structural features were identified in the quenched alloys: (1) the cph z phase, (2) a microcrystalline phase, (3) Ni3Ta with lower than equilibrium Ta content, and (4) extended solid solubility of the (Ni) solid solution. 33The: E. Therkelsen, Met. Alloys, 4, 105-108 (1933). 49Kub: O. Kubaschewski and H. Speidel, J. Inst. Met., 75, 417-430 (1948-1949). 53Kor: I.I. Kornilov and E.N. Pylaeva, Akad. Nauk SSSR, Inst. Obshch. Neorg. Khim., 23, 110-117 (1953) in Russian; TR: Lawrence Radiation Laboratory, Univ. of California, Trans. #970 (1953). 62Kor: I.I. Kornilov and E.N. Pylaeva, Russ. J. Inorg. Chem., 7(3), 300-303 ( 1962). 67Ruh: R.C. Ruhl, B.C. Giessen, M. Cohen, and N.J. Grant, J. Less-Common Met., 13(6), 611-618 (1967). 77Pim: V.N. Pimenov, Yu.E. Ugaste, and K.A. Akkushkarova, Russ. Metall., 1, 155-159 (1977). 83Nas: P. Nash and D.R.F. West, Met. Sci., 17(2), 99-100 (1983). Published in Phase Diagrams of Binary Nickel Alloys, 1991. Complete evaluation contains 4 figures, 3 tables, and 37 references. Special Points of the Ni-Ta System