Abstract
通过改变脉冲电压强度和脉冲作用次数，借助金相分析系统研究了脉冲电流处理工艺参数对AZ31B镁合金的微观形貌的演变规律。研究发现随着脉冲电压强度或脉冲作用次数的增加，平均晶粒尺寸均会呈现长大趋势，尤其电压强度的影响更明显。且脉冲电流处理后样品中生成大量的拉伸孪晶，这主要是由于脉冲电流作用瞬间晶粒内部热膨胀和升温不同引起的热压应力所致。 The effect of electric current parameters, including the pulsed voltage intensity and the electric pulse repeating times on the microstructural evolution of AZ31B magnesium alloy was investigated by optical microscope method. The results showed that the grains become coarser with increasing either the pulsed voltage intensity or the repeating times. In addition, the application of electric current was beneficial to the formation of tensile twins, which could be ascribed to the thermal compressive stress formed due to the nonsynchronous between the temperature increment and the thermal expansion inter the grains during current passing.
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