Preparation of bimetallic nano-composite by dissimilar friction stir welding of copper to aluminum alloy  

异种搅拌摩擦焊制备铜铝合金双金属纳米复合材料

作　　者：Farhad BAKHTIARI ARGESI Ali SHAMSIPUR Seyyed Ehsan MIRSALEHI Farhad BAKHTIARI ARGESI;Ali SHAMSIPUR;Seyyed Ehsan MIRSALEHI(Department of Mining and Metallurgical Engineering,Amirkabir University of Technology,Tehran,Iran)

机构地区：[1]Department of Mining and Metallurgical Engineering,Amirkabir University of Technology,Tehran,Iran

出　　处：《Transactions of Nonferrous Metals Society of China》2021年第5期1363-1380,共18页中国有色金属学报（英文版）

摘　　要：Butt friction stir welding between pure copper and AA5754 alloy was carried out.Reinforcing SiC nanoparticles were utilized in friction stir welded(FSW)joints to decline the harmful effects of intermetallic compounds.Tensile tests,micro-hardness experiments,scanning electron microscopy and X-ray diffraction analysis were applied to studying the properties of welded joints.The joints with a travel speed of 50 mm/min and a rotation speed of 1000 r/min showed the best results.The presence of nano-sized SiC particles reduced the grain size of aluminum and copper in the stir zone(SZ)from 38.3 and 12.4μm to 12.9 and 5.1μm,respectively.The tensile strength of the joint in the presence of reinforcing SiC nano-particles was~240 MPa,which is~90%of that for the aluminum base.Furthermore,the highest microhardness of the weld zone was significantly increased from HV 160 to HV 320 upon the addition of SiC nano-particles.The results also showed that raising the heat generation in FSW joints increased the amount of Al_(4)Cu_(9) and Al_(2)Cu intermetallic compounds.对纯铜与AA5754合金进行对接搅拌摩擦焊接。为了降低金属间化合物的有害影响,在搅拌摩擦焊(FSW)接头中添加纳米SiC强化颗粒。采用拉伸试验、显微硬度试验、扫描电镜和X射线衍射分析方法研究焊接接头的性能。结果显示,当焊接速度为50 mm/min、转速为1000 r/min时接头的性能最好。纳米SiC颗粒的存在使搅拌区(SZ)铝和铜的晶粒尺寸分别从38.3和12.4μm减小到12.9和5.1μm。含SiC纳米增强颗粒的接头其抗拉强度约为240 MPa,是铝基体的~90%。且添加SiC纳米颗粒使接头焊缝区的最高显微硬度从HV 160显著增加到HV 320。结果还表明,FSW接头中生成热的升高使Al_(4)Cu_(9)和Al_(2)Cu金属间化合物的数量增加。

关 键 词：friction stir welding dissimilar Al/Cu joint SiC nano-particles intermetallic compounds microstructural characteristics mechanical properties 

分 类 号：TB331[一般工业技术—材料科学与工程] TG453.9[金属学及工艺—焊接]