| 摘要 |
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<a<10, (3) 0.05<b<1.0 are satisfied and comprising an Mg matrix phase in which Mg-Zn-X-based quasi-crystals and their approximant crystals are dispersed in the form of fine particles and a method of production of a high strength magnesium alloy comprising melting Mg in an inert atmosphere to form an Mg melt, adding Mg-Zn-X-based quasi-crystals (X being at least one of Zr, Ti, and Hf) into the Mg melt to form an alloy melt, casting the alloy melt, and heat treating the obtained casting to make the quasi-crystal and their approximant crystals precipitate in an Mg matrix phase.
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