A series of high temperature creep resistant magnesium alloys for die casting based on AZ91 were successfully developed by the addition of Rare Earth, and Calcium. The original target of magnesium alloy development was aimed at cylinder head cover of high power diesel engine, and tried to satisfy the temperature demands of gear-box house. The tensile property at room temperature, creep behavior at 150ı,and analysis of microstructure were discussed in this paper. The results showed that these alloys has potential for die casting to produce power-train parts, and
greatly decrease the weigh of parts.
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