Фазовая диаграмма системы Ho-Mg

К оглавлению: Другие диаграммы (Others phase diargams)

Ho-Mg (Holmium-Magnesium) A.A. Nayeb-Hashemi and J.B. Clark The Mg-Ho phase diagram, which has not been determined except for the Mg-rich side, is expected to be similar to that of the Mg-Er system. However, the presence of three intermetallic compounds-Mg24Ho5, Mg2Ho, and MgHo-has been reported. The assessed phase diagram in the Mg-rich region (0 to 13 at.% Ho) is based on the work of [78Rok], and the remainder of the diagram is based on the data of [64Kri], [64Mil], [67Kri], and [73Spe] and on extrapolation from the homologous Mg-Gd system. The maximum solid solubility at 565 C (eutectic temperature) was placed by extrapolation at 5.44 at.% Ho [78Rok]. The solid solubility of Mg in (Ho) has not been determined, but is estimated to be ~13 at.% Mg [65Jos]. 64Kri: P.I. Kripyakevich, V.I. Evdokimenko, and E.I. Gladysevskii, Kristallografiya, 9(3), 410-411 (1964) in Russian; TR: Sov. Phys. Crystallogr., 9(3), 330-331 (1964). 64Mil: A.E. Miller and A.H. Daane, Trans. Metall. Soc. AIME, 230, 568-572 ( 1964). 65Jos: R.R. Joseph and K.A. Gschneidner, Jr., Trans. Metall. Soc. AIME, 233, 2063-2069 (1965). 67Kri: P.I. Kripyakevich and V.I. Evdokimenko, Z. Anorg. Allg. Chem., 355, 104- 112 (1967) in German. 73Spe: F.H. Spedding, B. Sanden, and B.J. Beaudry, J. Less-Common Met., 31, 1- 13 (1973). 78Rok: L.L. Rokhlin and L.P. Deyava, Izv. Akad. Nauk SSSR, Met., (5), 219-221 ( 1978) in Russian; TR: Russ. Metall., (5), 171-172 (1978). Published in Phase Diagrams of Binary Magnesium Alloys, 1988. Complete evaluation contains 1 figure, 4 tables, and 18 references. Special Points of the Mg-Ho System