脉冲电流对铝合金拉伸性能及缺陷愈合影响分析

Analysis of influence of pulsed electric current on tensile properties and defect healing of aluminum alloys

随着汽车轻量化要求的提高,铝合金在汽车行业的使用越来越广泛,对于铝合金缺陷的修复以及力学性能的提高成为了研究的重点。通过拉伸实验研究脉冲电流处理对6061-T6铝合金试件抗拉强度和伸长率的影响,并借助有限元仿真软件进行热电耦合分析,研究缺陷附近电流强度和应力的变化。结果表明,脉冲电流处理能够提高6061-T6铝合金试件的抗拉强度和伸长率,提升其力学性能;进一步通过热电耦合分析发现,在不同位置、不同形状的孔洞缺陷附近电流强度和应力大小均不相同,说明不同位置、不同形状缺陷的愈合效果各不相同。

Due to the increase in the requirement of automobile lightweight,aluminum alloys are more and more widely used in the automotive industry,and the repair of defects and the improvement of mechanical properties of aluminum alloys have become the focus of research.The effects of pulsed current treatment on the tensile strength and elongation of 6061-T6 aluminum alloy specimens were investigated by tensile experiments,and the changes of current intensity and stress near the defects were studied by coupled thermalelectrical analysis with the help of finite element simulation software.The results showed that the pulse current treatment could improve the tensile strength and elongation of 6061-T6 aluminum alloy specimens and enhance their mechanical properties.The results of coupled thermal-electrical analysis showed that the intensity and stress magnitude of the current near the defects of different shapes of voids at different locations were different,indicating that the healing effect of different shapes of defects at different locations was different.