Mn对镁合金电阻点焊微观结构和力学性能的影响

杨绍斌; 李超; 沈丁; 董伟

doi:10.15980/j.tzzz.2016.03.001

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Mn对镁合金电阻点焊微观结构和力学性能的影响
Microstructure and Mechanical Properties of Resistance Spot Welding Magnesium Alloys with Mn Particle Addition
2016年36卷第3期页码：225-228
纸质出版日期： 2016 ，
DOI： 10.15980/j.tzzz.2016.03.001

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[1]杨绍斌,李超,沈丁,董伟.Mn对镁合金电阻点焊微观结构和力学性能的影响[J].特种铸造及有色合金,2016,36(03):225-228.

Yang Shaobin, Li Chao, Shen Ding, et al. Microstructure and Mechanical Properties of Resistance Spot Welding Magnesium Alloys with Mn Particle Addition[J]. Special Casting & Nonferrous Alloys, 2016,36(3):225-228.
[1]杨绍斌,李超,沈丁,董伟.Mn对镁合金电阻点焊微观结构和力学性能的影响[J].特种铸造及有色合金,2016,36(03):225-228. DOI： 10.15980/j.tzzz.2016.03.001.

Yang Shaobin, Li Chao, Shen Ding, et al. Microstructure and Mechanical Properties of Resistance Spot Welding Magnesium Alloys with Mn Particle Addition[J]. Special Casting & Nonferrous Alloys, 2016,36(3):225-228. DOI： 10.15980/j.tzzz.2016.03.001.

摘要

通过在镁合金电阻点焊中加入Mn颗粒的方法

利用金相显微镜、扫描电镜（SEM）、能谱分析（EDS）等对比研究了添加Mn颗粒点焊接头的组织形貌和力学性能的变化。结果表明

随着Mn添加量增加

点焊接头熔核区等轴晶逐渐增多

热影响区晶粒细化。Mn颗粒的加入使接头处的组织在凝固时产生更多的异质形核结构

从而使合金的显微硬度和拉剪力也有所提高。当Mn颗粒添加量为1.0mg时

镁合金电阻点焊接头拉剪力最大

为2.1kN

比未添加Mn时增加了23.5%。当添加量达到4.0mg时

熔核区等轴晶消失

出现大量的胞状树枝晶

力学性能随之降低。

Abstract

Microstructural evolution and mechanical properties of AZ31 magnesium alloy welding joint with Mn particle addition by resistance spot welding were investigated by using optical microscopy

scanning electron microscopy（SEM）and energy dispersive spectrometer（EDS）.The results show that with the increase of Mn addition

equiaxed dendrites are increased gradually in nuclear area of spot welding fusion

and grain in the heat affected zone is refined.More heterogeneous nucleation is generated with the addition of Mn particles during solidification process

so that the microhardness and tensile shear force are also improved.The maximum tensile shear force of resistance spot welding joint of magnesium alloys is 2.1kN with 1.0mg Mn particles addition

increased by 23.5% compared with that of one without Mn addition.When adding 4.0mg Mn

equiaxed dendrites disappear in nuclear zone of spot welding fusion

and a large number of cellular dendrites appear

resulting in the decrease of mechanical properties of the welding joint.