206 Preparation of ultra fine-grained magnesium alloy by mechanical alloying of AZ31 chip-aluminum powder mixture

概要

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To produce magnesium alloy with ultra fine-grain, size, an aluminum powder was mixed to turning chips of AZ31 alloy with various contents, and then they were mechanically alloyed for various milling times. Microstructural changes of the mechanically alloyed powder with milling were investigated. Super-saturated solid solutions of the magnesium phase are formed in the Mg-12mol%Al, its crystalline size has a nanometer scale. The solid solutions are formed the eutectic structure together with Mg_<17>Al_<12> in the 30mol%Al powder mixtures mechanically alloyed for long milling time. In the case of the Mg-40mol%Al and 61.5mol%Al powders, the formation of the intermetallic compounds yields by the mechanical alloying for shorter milling time, and these crystals become to amorphous phase after the prolonged milling time. The harness of particles in the mechanically alloyed powder increases with forming of the super saturated solid solution or the intermetallic compound and their refining.