锻压技术

脉冲电流对AZ31镁合金板材单向拉伸性能的影响

英文标题：Influence of pulse current on uniaxial tensile properties for AZ31 magnesium alloy plate

作者：宋江豪杨尚王刚杨建雷

分类号：TG146.2；TG115.5

出版年,卷(期):页码：2023,48(12):25-34

摘要：

为进一步研究和完善脉冲电流对镁合金塑性加工过程中的影响规律，提升镁合金的塑性变形能力，通过对AZ31镁合金板材进行电塑性拉伸实验，研究其在不同电流密度下对板材拉伸力学性能、微观组织演变的影响规律。结果表明：随着电流密度的升高，镁合金板材的伸长率呈现先升高后降低的趋势；引入脉冲电流后，镁合金电塑性拉伸的变形激活能Q=79.447 kJ·mol-1；随着电流密度的升高，AZ31镁合金拉伸断口由脆性断裂转变为韧性断裂，最后由于电流密度升高及缩颈的产生导致熔断。研究发现，电流的加入有降低流动应力的效果，有利于再结晶形核进而进行动态再结晶，从而使镁合金的塑性得到提高。

In order to further study and improve the influence laws of pulse current on the plastic processing process of magnesium alloy and improve its plastic deformation ability, the electroplastic tensile test of AZ31 magnesium alloy plate was carried out to study its influence laws on mechanical properties and microstructure evolution of plate under different current densities. The results show that with the increasing of current density, the elongation of magnesium alloy plate increases first and then decreases. After the introduction of pulse current,the deformation activation energy Q of magnesium alloy electroplastic tensile is 79.447 kJ·mol-1. With the increasing of current density, the tensile fracture of AZ31 magnesium alloy plate changes from brittle fracture to ductile fracture, and finally melts due to the increasing of current density and the occurrence of necking. It is found that the addition of current has the effect of reducing the flow stress, which is conducive to recrystallization nucleation and dynamic recrystallization, so as to improve the plasticity of magnesium alloy.

基金项目：

国家自然科学基金资助项目（51905123）

作者简介：宋江豪（2002-），男，本科生 E-mail：sjh15516774695@163.com 通信作者：杨建雷（1986-），男，博士，副教授 E-mail：jlyang@hit.edu.cn

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