AZ31镁合金扩散焊接实验

Diffusion Bonding of AZ31 Magnesium Alloy

根据原子扩散理论对AZ31镁合金进行了扩散连接工艺研究。在Gleeble-1500型热/力模拟试验机上,对AZ31镁合金进行了在不同连接工艺条件下的扩散连接,在电子万能试验机上对扩散连接接头进行了剪切强度试验,从而获得了AZ31镁合金的最佳扩散连接工艺参数。利用金相显微镜、扫描电镜(SEM)对扩散连接接头微观组织进行分析,得出了AZ31镁合金主要是通过原子扩散和晶粒长大造成的原始焊接表面晶界的移动,促使接头表面原子充分扩散,形成牢固的连接。

In this paper, research on diffusion bonding of AZ31 magnesium alloy was carried out according to atomic diffusion theory. Gleeble-1500 testing machine is used in the diffusion bonding experiment on the AZ31 magnesium alloy. In addition, shear experiments of welded joints are carried out with electronic universal testing machine, and the optimum diffusion bonding parameters are obtained. The microstructures of the welded joints are analyzed through metallographic microscopy and SEM. It＇s deduced that the micro mechanism of diffusion bonding is the slide of original grain boundaries caused by atom diffusion and the growth of grains of the AZ31 material, sound joint was obtained through sufficient diffusion of the surface atom of the joints.