| 摘要 |
PROBLEM TO BE SOLVED: To provide cast articles of a heat-resistant magnesium alloy superior in mechanical properties and creep properties, with improved castability and creep strength, and a manufacturing method therefor. SOLUTION: The cast article made from the magnesium alloy includes 1.5-6 wt.% Al, 0.5-3 wt.% Ca, 0.21-1 wt.% Sr, 0.1-1 wt.% Mn, and the balance Mg with unavoidable impurities, has a grain structure mainly comprising magnesium crystal grains principally consisting of magnesium, and crystallized products principally consisting of Al and Ca, and Al and Mn, which are crystallized in grain boundaries of the crystal grains, and is characterized in that the crystallized products occupy an area of 5-25% in a cross section of the grain structure.
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