Magnesium Casting Alloy Having Good Yield Strength and Creep Resistance

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The present invention relates to calcium (Ca) based Mg provided Al non-Sn alloy system, strontium (Sr), or silicon (Si) alloy system of microscopic metal (Mm) constituting a ratio of alloy elements through modulation of adding alloying element, solid solution strengthening effect because of the various existing commercial magnesium alloy formed with a stabilized phase contrast give excellent economy on yield strength and excellent in castable magnesium alloys to provide high temperature/my creep intended. Magnesium alloy is 3 according to the present invention. 0 - 6. 5% by weight of Al, 3. 0 - 8. 0% by weight of Sn, 0. 1 - 2. 0% by weight of Ca, 0. 1 - 0. 5% by weight of Mn, 0. 01 - 1. 0% by weight of Sr, 0. 01 - 0. 5% by weight of rare earth metal containing, characterized by comprising the remainder magnesium impurities.