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A high strength magnesium alloy improving the high temperature strength while not using any expensive rare earth elements and thereby reducing the cost and its method of production are provided, that is, a high strength magnesium alloy of a composition of the formula Mg100-(a, b)ZnaXb wherein X is one or more elements selected from Zr, Ti, and Hf, a and b are the contents of Zn and X expressed by at %, and the following relationships (1), (2), and (3) : (1) a/28<=b<=a/9, (2) 2
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