Фазовая диаграмма системы Ga-Mg

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Ga-Mg (Gallium-Magnesium) A.A. Nayeb-Hashemi and J.B. Clark The equilibrium phases of the Mg-Ga system are (1) the liquid, L; (2) the terminal solid solution, (Mg), with a solubility limit of 3.14 at.% Ga; (3) the stoichiometric Mg5Ga2 intermediate phase with a complex cubic structure; ( 4) the Mg2Ga phase with a complex hexagonal structure and the possibility of a homogeneity range extending from 31 to 37 at.% Ga; (5) the stoichiometric MgGa phase with a complex bct structure; (6) the stoichiometric MgGa2 phase with an orthorhombic structure; (7) the stoichiometric Mg2Ga5 phase with a bct structure; and (8) the terminal solid solution, (Ga), with negligible solubility of Mg. The liquidus in the assessed phase diagram is taken from [ 37Pus] and [38Hum], and the (Mg) solidus and solvus are from [38Hum]. The studies of [69Pre], [80Ell], and [81Pre] were also reviewed. The formation of supersaturated (Mg) solid solutions of up to 14 at.% Ga have been reported, as well as a glass phase in a splat-cooled alloy of 18.73 at.% Ga. When the glass phase was heated, a metastable intermetallic compound of 18. 73 at.% Ga was formed. [80Ell] reported the formation of a metastable-type MgGa2 compound, isotypic with CaIn2, during the solidification of the undercooled liquid alloy. [61Cur] reported a metastable modification of Ga with an orthorhombic structure, which formed from crystallization of supercooled liquid at -16.3 C. 37Pus: N.A. Puschin and O.D. Micic, Z. Anorg. Allg. Chem., 234, 229-232 (1937) in German. 38Hum: W. Hume-Rothery and G.V. Raynor, J. Inst. Met., 63, 201-226 (1938). 61Cur: H. Curien, A. Rimsky, and A. Deffrain, Bull. Soc. Fr. Miner. Crist., 84, 260-263 (1961) in French. 69Pre: B. Predel and D.W. Stein, J. Less-Common Met., 18, 202-213 (1969) in German. 80Ell: M. Ellner, T. Goedecke, G. Duddek, and B. Predel, Z. Anorg. Allg. Chem., 463, 170-178 (1980) in German. 81Pre: B. Predel, Physica, 103B, 113-122 (1981). Published in Bull. Alloy Phase Diagrams, 6(5), Oct 1985 and Phase Diagrams of Binary Magnesium Alloys, 1988. Complete evaluation contains 1 figure, 7 tables, and 36 references. Special Points of the Mg-Ga System