Development of High Strength Magnesium Alloys by Rapid Solidification

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High-strength magnesium alloys have been developed by rapidly solidified powder metallurgy (RS P/M) processing, as consequence of preliminary investigations of alloy compositions using the melt-spun Mg-X1-X2 (X=Li, Al, Zn, Ca, Sn and Y) alloys. Mg_<97>Zn_1Y_2 and Mg_<96>Zn_1Y_3 (at.%) alloys exhibited high tensile yield strength, good ductility, high elevated-temperature strength and high-strain-rate superplasticity that have been realized. The Mg_<97>Zn_1Y_2 RS P/M alloy essentially consisted of hcp-Mg fine grains of 100 to 200 nm in diameter with and without novel 18R-type long period stacking structure. The 18R-type long period stacking structure improves the strength of the Mg_<97>Zn<1>Y_2 RS P/M alloys as well as the fine grains. Furthermore, the long period stacking structure exhibits high thermal stability. These RS P/M : magnesium alloys are the promising candidate among lightweight structural materials.