MAGNESIUM ALLOY FOR CASTING, AND MAGNESIUM ALLOY CASTING

摘要

PROBLEM TO BE SOLVED: To provide a magnesium alloy for casting suitable for use at high temperature.;SOLUTION: The magnesium alloy for casting includes, by mass, 1 to 5% copper (Cu), 0.1 to 5% calcium (Ca) and tin (Sn) of 0.1 to 3 by a mass ratio (Sn/Ca) to the Ca, and the balance magnesium (Mg) with inevitable impurities. By the incorporation of Cu, Ca and Sn, the crystallized products of an Mg-Cu based compound and an Mg-Ca-Sn based compound are crystallized out on the crystal grain boundaries of Mg crystal grains, so as to be a network shape (three-dimensional network shape). By the three-dimensional network structure, boundary sliding particularly activated when temperature is made high is suppressed, so as to improve its high temperature strength and creep strength. Further, since Sn preferentially forms a compound with Ca, its influence on thermal conductivity is smaller than the case of the other additional elements.;COPYRIGHT: (C)2009,JPO&INPIT