Фазовая диаграмма системы Cd-In

К оглавлению: Другие диаграммы (Others phase diargams)


Cd-In (Cadmium-Indium) J. Dutkiewicz, L. Zabdyr, Z. Moser, and J. Salawa The assessed Cd-In phase diagram includes the following equilibrium phases: (1) the liquid, L; (2) the terminal (Cd) solid solution, with a maximum solubility of 1.4 at.% In; (3) aT, the tetragonal (In) solid solution, with a maximum solubility of 5.8 at.% Cd; (4) aK, the fcc (In) solid solution, with a maximum solubility of 19.2 at.% Cd; and (5) ordered fcc AuCu3-type Cd3In, with a narrow range of homogeneity shifted to the Cd side at higher temperatures. The diagram is based primarily on the data of [59Heu], [62Heu], and [71Ros]. The liquidus curve is accepted from [59Heu] and [62Heu] for In-rich alloys, because they used high-purity starting materials and very low cooling/heating rates for their measurements. A later calorimetric study by [71Ros] shows good correspondence. The eutectic temperature was found by [59Heu] to be 127.7 C; the eutectic composition from [59Heu] is 74.3 at.% In. The assessed peritectic temperature (196 C) is accepted from [59Heu]. The eutectoid decomposition of Cd3In, inferred from the characteristic lamellar decomposition structure in the optical microscopy study of [59Heu], was confirmed by [71Ros]. The solid solubility of In in (Cd) was estimated precisely in [59Heu] as 1.4 at.% In at 138 C by quantitative metallographic analysis. The maximum solid solubility of 19.2 at.% Cd in (In) at 126 C is also accepted from [59Heu]. A martensitic transformation described by [62Heu] occurs in the composition range 94 to 96 at.% In. The high-temperature fcc aK phase transforms reversibly on cooling into the tetragonal aT phase. The mechanism of the transformation was discussed by [82Nit], who also reported that alloys containing 94.5 to 96 at.% In exhibit a shape-memory effect. After splat quenching to -190 C, an extended metastable a phase field (A1 structure) was found by [68Sri] in the composition range 20 to 90 at.% In. [73Gar] showed the solid solubility of Cd in (In) at 1960 MPa decreasing to 8 at.% Cd and the eutectic point shifting to 12.5 at.% In and 220 C. The temperature range of existence of Cd3In is much wider under pressure than at room temperature. 59Heu: T. Heumann and B. Predel, Z. Metallkd., 50, 309-314 (1959) in German. 62Heu: T. Heumann and B. Predel, Z. Metallkd., 53, 240-248 (1962) in German. 68Rid: N. Ridley, Br. J. Appl. Phys., Ser. 2, 1, 955-956 (1968). 68Sri: P.K. Srivastava, B.C. Giessen, and N.J. Grant, Acta Metall., 16, 1199- 1208 (1968). 71Ros: A. Rosina, Rud. Met. Zb., 2(3), 85-105 (1971). 71Str: M.E. Straumanis, P.B. Rao, and W.J. James, Z. Metallkd., 62, 493-498 ( 1971). 73Gar: V.K. Gartman and E.G. Ponyatovsky, Zh. Fiz. Khim., 47, 1664-1665 (1973) in Russian. 82Nit: O. Nittono and Y. Koyama, Trans. Jpn. Inst. Met., 23, 285-295 (1982). Submitted to the APD Program. Complete evaluation contains 3 figures, 5 tables, and 40 references. Special Points of the Cd-In System