Фазовая диаграмма системы Ag-Pb

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Ag-Pb (Silver-Lead) I. Karakaya and W.T. Thompson The equilibrium phases of the Ag-Pb system are the liquid, L; two solids; and a vapor phase. The system is a eutectic type with limited solid solubility at both the Ag and Pb sides of the diagram. The assessed phase diagram is based primarily on the work of [40Chi], [42Rau], [56Kle], [60Pre], and [83Ako]. It was obtained by thermodynamic modeling and is superficially similar to the diagrams of [80Ell] and [81Ash]. In positioning the Ag liquidus near the eutectic composition, emphasis was given to the chemical equilibrium studies of [56Kle] and the diffusion studies of [60Pre]. The solid solubility of Pb in Ag has been determined by thermoelectric power measurements [75Gla] and thermoelectric power and lattice parameter measurements [83Ako] over the temperature range of 300 to 900 C. Micrographic and lattice parameter measurements for temperatures in the range 300 to 900 C have been reported by [42Rau]. Lattice parameter measurements for temperatures in the range of 250 to 300 C have also been reported by [40Chi]. Although the extrapolation of the data of [40Chi] by [Hansen] approaches zero solubility of Pb in Ag at 200 C, a 0.3 at.% solubility was measured at this temperature by thermoelectric power measurement [67Pol]. The experimental data show close agreement for the solid solubility of Pb in Ag in the temperature range 300 to 600 C. The solid solubility of Ag in (Pb) is very restricted; the maximum solubility has been reported as 0.19 at.% at the eutectic temperature [81Kus]. In electrodeposited alloys, [43Rau] reported that more than 5.5 at.% Pb can be held in supersaturated solid solution. However, rapid cooling experiments [ 82Zho] do not indicate that more than 2.9 at.% Pb can dissolve in solid Ag. Metastable Pb-rich solid solutions with up to 12 at.% Ag have been made by splat cooling [72Ray]. Superconducting transition temperatures of the metastable (Pb) solid solution were found to be linearly lowered at the rate of 0.026 K/at.% Ag. 40Chi: H.H. Chiswick and R. Hultgren, Trans. AIME, 137, 442-446 (1940). 42Rau: E. Raub and A.V. Polaczek-Wittek, Z. Metallkd., 34, 93-96 (1942) in German. 43Rau: E. Raub and A. Engel, Z. Elektrochem., 49, 89-97 (1943) in German. 56Kle: O.J. Kleppa, J. Phys. Chem., 60, 446-452 (1956). 60Pre: G.W. Preckshot and R.E. Hudrlik, Trans. Met. Soc. AIME, 218, 516-518 ( 1960). 67Pol: D.D. Pollock, Trans. Met. Soc. AIME, 239, 1768-1770 (1967). 72RAy: R. Ray, S.H. Hahn, and B.C. Giessen, Acta Metall., 20, 1335-1337 (1972). 75Gla: B.M. Glazov and P.A. Akopyan, Izv. Akad. Nauk SSSR Met., 1, 162-165 ( 1975) in Russian. 80Ell: R.P. Elliott and F.A. Shunk, Bull. Alloy Phase Diagrams, 1, 56-59 (1980) . 81Ash: S. Ashtakala, A.D. Pelton, and C.W. Bale, Bull. Alloy Phase Diagrams, 2, 81-83 (1981). 81Kus: K. Kusunoki, K. Tsumuraya, and S. Nishikawa, Trans. Jpn. Inst. Met., 22, 501-513 (1981). 82Zho: X. Zhou, J. Jin, Y. Ning, and Z. Zhao, Acta Metal. Sin. (China), 18, 534-539 (1982) in Chinese. 83Ako: R.A. Akopyan, S.Kh. Mamedova, and E.R. Kerimov, Izv. V.U.Z. Tsvetn. Metall., (6), 83-86 (1983) in Russian. Published in Bull. Alloy Phase Diagrams, 8(4), Aug 1987. Complete evaluation contains 8 figures, 8 tables, and 52 references. 1