脉冲电流条件下工业态AZ31镁合金板材的气胀成形Gas blow forming of commercial AZ31 magnesiumassisted by pulse current

为解决工业态非细晶AZ31镁合金板材气胀成形能力差、成形极限低等问题，将脉冲电流引入到材料的气胀成形过程中，并对工业态非细晶AZ31镁合金板材进行脉冲电流辅助气胀成形研究。自由胀形实验表明：脉冲电流可提高工业态非细晶AZ31镁合金板材的气胀成形极限。显微组织分析表明：在脉冲电流辅助变形条件下，非细晶AZ31镁合金板材的气胀成形是多种变形机制综合作用的结果，这包括晶界滑移及扩散蠕变，晶内位错滑移及孪晶变形等。对脉冲电流作用机制的分析表明：脉冲电流可提升位错的扩散活性，增强其可动性，从而促进了上述变形机制的作用效果，提高了材料的气胀成形能力。

In order to improve the poor formability and forming limit of the commercial non-fine grain AZ31 magnesium, pulse current was employed during the gas blow forming, and pulse current auxiliary gas blow forming of the commercial non-fine grain AZ31 Mg alloy was studied. The results of the free bulging indicate that the forming limit of the commercial non-fine grain AZ31 magnesium can be improved by the pulse current. The microstructures of the formed parts indicate that the forming mechanism of the commercial non-fine grain AZ31 magnesium under pulse current auxiliary is the combined action of many kinds of deformation mechanisms, such as the grain boundary sliding and diffusion creep, dislocation sliding inside the grain and the twin deformation. The mechanism of the pulse current effect on the deformation was studied. The result shows that the dislocation activity can be enhanced by the pulse current, therefore, the formability of the commercial AZ31 magnesium during gas blow forming can be increased.

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