Zn中间层下钢与铝基复合材料的搅拌摩擦焊研究
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摘要
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.
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.
引文
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[2]鲁修宇,仇东丽,夏艳花,等.我国汽车用电镀锌板的发展趋势[J].热加工工艺,2016,45(14):16-18.
[3]BouchéK,Barbier F,Coulet A.Intermetallic compound layer growth between solid iron and molten aluminium[J].Materials Science&EngineeringA,1998,249(1/2):167-175.
[4]高增,牛济泰,王西涛.SiCp/Al复合材料焊接方法及其填充材料研究进展[J].热加工工艺,2014,43(15):11-15.
[5]张贵锋,张建勋,钟明波,等.铝基复合材料/低碳钢异种材料过渡液相扩散焊[J].焊接学报,2007,28(9):59-62.
[6]付宁宁,戴忠晨.铝合金车体侧墙搅拌摩擦焊工业化生产应用研究[J].金属加工(热加工),2016(16):18-19.
[7]Dehghani M,Amadeh A,Mousavi SAAA.Investigations on the effects of friction stir welding parameters on intermetallic and defect formation in joining aluminum alloy to mild steel[J].Materials&Design,2013,49(6):433-441.
[8]张婧,封小松,黄珲,等.铝/铝基SiC复合材料搭接微搅拌摩擦焊工艺特性[J].稀有金属材料与工程,2016(3):720-726.
[9]王友彬,曾建民.钢板表面热浸镀锌层的拉伸断裂机理[J].机械工程材料,2015,39(2):13-21.
[10]董鹏,陈凯华,肖荣诗.铝-铜异种金属激光深熔钎焊接头力学性能[J].中国激光,2011(6):129-133.