搅拌摩擦加工制备镁基铝覆层材料的组织与性能

在采用多道次搅拌摩擦加工成功地在镁合金表面覆合一层铝层的基础上，利用光学显微镜、透射电子显微镜、扫描电子显微镜、能谱分析和电子万能材料试验机对界面组织、元素成分分布、界面结合力和断口形貌进行了分析，并分析了不同焊接速度对重叠区界面组织和性能的影响规律.结果表明，界面由N道次区、重叠区和N+1道次区组成，重叠区界面过渡层的厚度随着焊接速度的降低而增加.其过渡层由Al+Al₃Mg₂相和Mg+Al₁₂Mg₁₇相组成.重叠区界面的剪切力随着速度的降低而增加，断裂方式为塑性断裂.

Microstructure and properties of surface aluminizing on magnesium by friction stir processing

Surface aluminizing on magnesium was successfully farbricated by multi-pass friction stir processing (MP-FSP). The interface microstructure, mechanical properties, fractured surface and components were investigated by using optical microscopy (OM), electron probe microanalysis (EPMA), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy disperse spectroscopy (EDS) and electromechanical testing machine. In addition, the effect of different welding speed on the overlapping area (OA) interface microstructre and properites were also analyzed. The results showed that the interfacial macrostructure was consisted of N pass, OA and N+1 pass. A conversion zone containing Al+Al3Mg2 and Mg+Al12Mg17 was formed in the interfacial macrostructure. The thickness of OA conversion zone was increased with the welding speed decreased. Shear tensile test results showed that the shear force of the OA interface was increased with the welding speed decreased. The fracture mode was plastic fracture.