PURPOSE: An alloy is provided which has superior ordinary temperature strength and elongation by adding Ca to a Mg-Zn alloy. CONSTITUTION: The high strength Mg-Zn-Ca alloy comprises 5.0 to 6.5 wt.% of Zn, 0.1 to 0.5 wt.% of Ca and a balance of Mg. The tensile strength and elongation of the Mg-Zn-Ca alloy are much more increased compared to a Mg-6 wt.% Zn binary alloy due to grain micronization by addition of Ca according to the increase of an amount of Ca. On the contrary, the strength and elongation of the Mg-Zn-Ca alloy are decreased since a compound formed induces brittle fracture when the amount of Ca becomes 0.5 wt.% or more. Furthermore, the Mg-Zn-Ca alloy represents the similar to or more ordinary temperature tensile properties than an existing typical a Mg-Zn alloy of ZK61 and ZC63 alloys. The Mg-Zn-Ca alloy is suitable for a structural material of an automobile, airplane, etc. due to its light weight and can be used as a substitutional material for an existing Mg alloy structural material since the Mg-Zn-Ca alloy has the almost similar strength to an existing Mg-Zn-Zr alloy which represents the highest strength among the currently known Mg alloys and the Mg-Zn-Ca alloy is profitable in the aspects of production cost.
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