Фазовая диаграмма системы Be-Ta

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Be-Ta (Beryllium-Tantalum) H. Okamoto and L.E. Tanner Six intermediate phases have been identified in the Be-Ta system, but little or no information is available concerning the alloy phase relations. The assessed diagram shows the position of each phase and melting points where available. The melting point of bBe and the bBe = aBe allotropic transformation temperature are 1289 с 5 and 1270 с 6 C, respectively [Melt]. [50Kau] observed a eutectic network in a slowly cooled alloy containing 0.05 at.% Ta. Therefore, the solid solubility of Ta in (Be) is less than this value. The melting point of Ta is 3020 C [Melt]. The initial slope of the L/[L + (Ta) ] liquidus in the assessed diagram is drawn by assuming no solubility of Be in (Ta). [80Tan] predicted the existence of a stable or metastable compound, BeTa, with the CsCl-type crystal structure, from the study of a series of Be-transition metal systems. 50Kau: A.R. Kaufmann, P. Gordon, and D.W. Lillie, Trans. ASM, 42, 785-844 ( 1950). 57Bat: F.W. von Batchelder and R.F. Raeuchle, Acta Crystallogr., 10(10), 648- 649 (1957); TR: Acta Crystallogr., 10(12), 768 (1957). 57Gla: E.I. Gladyshevskii and P.I. Kripyakevich, Kristallografiya, 2, 742-745 ( 1957) in Russian; TR: Sov. Phys. Crystallogr., 2, 730-733 (1957). 58Che: Ye.Ye. Cherkashin, Ye.I. Gladyshevskiy, P.I. Kripyakevich, and Yu.B. Kuz'ma, Zh. Neorg. Khim., 3(3), 650-653 (1958) in Russian; TR: Russ. J. Inorg. Chem., 3(3), 135-141 (1958). 59Pai: R.M. Paine, A.J. Stonehouse, and W.W. Beaver, WADC Tech. Rept., Part I, 266 p (1959). 60Zal: A. Zalkin and D.E. Sands, U.S. At. Energy Comm. UCRL-5988-T, May 24, 6 p (1960). 61Zal: A. Zalkin, D.E. Sands, R.G. Bedford, and O.H. Krikorian, Acta Crystallogr., 14(1), 63-65 (1961). 65Gan: E. Gangleberger, E. Laube, and H. Nowotny, Monatsh. Chem., 96, 242-245 ( 1965) in German. 72Hav: E.E. Havinga, H. Damsma, and P. Hokkeling, J. Less-Common Met., 27, 169- 193 (1972). 75Stu: M. Stumke and G. Petzow, Z. Metallkd., 66, 292-297 (1975) in German. 80Tan: L.E. Tanner, Acta Metall., 28(12), 1805-1816 (1980). Published in Phase Diagrams of Binary Beryllium Alloys, 1987. Complete evaluation contains 3 figures, 2 tables, and 25 references. 1