| 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 0.1 to 5% silver (Ag), and the balance magnesium (Mg) with inevitable impurities. By the incorporation of Cu and Ca, the crystallized products of an Mg-Cu based compound and an Mg-Ca based compound are crystallized out on the crystal grain boundaries of Mg crystal grains, so as to be a 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 high temperature creep strength. Further, by the addition of Ag, the Mg crystal grains are made fine, and the three-dimensional network structure having high continuity and dense can be formed. Also, Ag hardly exerts adverse influence on the thermal conductivity of the magnesium alloy. COPYRIGHT: (C)2009,JPO&INPIT
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