Abstract
Plane strain compression were carried out for as-cast and pre-strained AZ31 alloy specimens at 210～330°C. The influence of initial grain on strengthening effect was analyzed by means of metallographic examination and mechanical testing. The results indicate the recrystallized grain of Mg alloy is sensitive to initial grain. With the deformation temperature increasing, the ultimate tensible strength decreases for as-cast and pre-strained alloy. With the deformation degree increasing, the tensile strength presents an increasing trend for as-cast alloy, but the tensile strength decreases on the whole for pre-strained alloy. The tensile strength increments of ～50% can be achieved under appropriate processing conditions.
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