Zn中间层下钢与铝基复合材料的搅拌摩擦焊研究

Study on Friction Stir Welding of Steel and Aluminum Matrix Composite with Zn Intermediate Layer

研究了不同Zn中间层厚度下镀锌钢与铝基复合材料搅拌摩擦焊接头形貌特征与元素分布规律。试验结果表明:随着Zn中间层厚度增加,Zn元素明显在接头界面富集,向铝基复合材料扩散明显,界面处硬度梯度逐渐增加。同时,当Zn中间层厚度增加时,铝基复合材料近缝区孔洞减少。当Zn中间层厚度为0.3 mm时,界面处仅有断续、微小的裂纹,此时界面结合较好,接头平均拉剪力最大,为2.06 kN。

The morphology and element distribution of friction stir welding joint of galvanized steel/aluminum matrix composites with different thicknesses of Zn interlayer were investigated.The test result shows that with the increase of Zn interlayer thickness,the Zn element enriches at the interface of the joint and diffuses to the aluminum matrix composites obviously,and the hardness gradient gradually increases at the interface.At the same time,the voids in aluminum matrix composite adjacent to the weld decrease gradually with the increase of thickness of Zn intermediate layer.When the thickness of Zn intermediate layer is 0.3 mm,there are only intermittent tiny cracks at the interface,the interface bonds well and the average tensile shear force is the biggest,which is 2.06 kN.