Фазовая диаграмма системы Cr-Si

К оглавлению: Другие диаграммы (Others phase diargams)

Cr-Si (Chromium-Silicon) A.B. Gokhale and G.J. Abbaschian The equilibrium phases of the Cr-Si system are (1) the liquid, L; (2) the terminal solid solution, (Cr), with a maximum solubility of approximately 9.5 at.% Si at the eutectic temperature of 1705 C; (3) the terminal solid solution, (Si), with a maximum solid solubility of approximately 8 x 10-6 at.% Cr at the eutectic temperature of 1305 C; (4) the cubic intermediate phase, Cr3Si, which melts congruently at 1770 C; (5) the tetragonal intermediate phase, Cr5Si3, which melts congruently at 1680 C and undergoes a polymorphic transformation at 1505 C; (6) the cubic intermediate phase, CrSi, which decomposes peritectically at 1413 C; and (7) the hexagonal intermediate phase, CrSi2, which melts congruently at 1490 C. The assessed phase diagram is based primarily on the work of [68Cha], with modifications based on the data of [55Par], [61Gol], and [71Koc]. The intermediate phases in the system, particularly CrSi2, possess characteristics such as high thermoelectric power, electrical conductivity, and high-temperature stability. This makes them desirable as materials for thermoelectric energy conversion. 55Par: E. Parthe, H. Nowotny, and H. Schmid, Monatsh. Chem., (86), 385-396 ( 1955) in German. 61Gol: H.J. Goldschmidt and J.A. Brand, J. Less-Common Met., (3), 34-43 (1961). 68Cha: Y.A. Chang, Trans. AIME, (242), 1509-1515 (1968). 71Koc: Ju.A. Kocherzhinsky, Therm. Anal., Proc. 3rd ICTA DAVOS, (1), 549-559 ( 1971). Published in Bull. Alloy Phase Diagrams, 8(5), Oct 1987. Complete evaluation contains 11 figures, 6 tables, and 35 references. Special Points of the Cr-Si System