Abstract
To produce magnesium alloy with ultra fine-grain size, powder mixtures, which aluminum powder was added to turning chips of AZ31 alloy with various contents, were mechanically alloyed for various milling times. Super-saturated solid solutions of the magnesium phase with crystalline size of nanometer scale are formed in the Mg-12mol%Al and 30mol%Al powder mixtures mechanically alloyed for 36ks, in the Mg-30mol%Al powder it forms the eutectic structure together with Mg_<17>Al_<12>. In the case of the Mg-40mol%Al and 61.5mol%Al powders, formation of the intermetallic compounds yields, and these crystals become to amorphous phase after the prolonged milling time. The harnesses of particles in the powder mechanically alloyed increase with forming of the super saturated solid solution or the intermetallic compound and their refining. The mechanically alloyed powder was extruded at various temperatures. The mechanical properties and structural change in the extruded magnesium alloy were investigated. Mechanical strength of the magnesium alloys made from the mechanically alloyed powder become higher than the alloy made from the AZ31 turning chips.
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