30mm厚7A52铝合金搅拌摩擦焊接组织与性能研究  

Microstructure and properties of welding joints of 30 mm thickness 7A52 aluminium alloy plate by friction stir welding

作　　者：马志华[1] 陈东高[1] 刘红伟[1] 郭海林[1] 刘泽林[1] 杨武林[1] 叶晨[1] 

机构地区：[1]中国兵器科学研究院宁波分院,浙江宁波315103

出　　处：《兵器材料科学与工程》2014年第2期63-65,共3页Ordnance Material Science and Engineering

基　　金：宁波市自然科学基金(2012A610052)

摘　　要：针对30 mm厚的7A52铝合金,采用搅拌摩擦焊接技术进行单道焊接试验,利用光学显微镜等工具对焊接接头组织及力学特性进行研究。结果表明:沿焊缝区横截面的硬度分布呈现W形,TMAZ/HAZ过渡区为接头软化区,硬度最低值在前进侧的TMAZ/HAZ过渡区;焊接接头强度达到母材强度的85.8%,断裂于TMAZ/HAZ过渡区,为韧窝断口形貌。The 7A52 aluminum alloy of 30 mm thickness was welded by friction stir welding. The microstructure and mechanical property of welded joint were studied by optical microscope and SEM, etc. The results show that the hardness distribution along cross section in welded zone is in the shape of W, and the TMAZ/HAZ transition zone of welded joint is the softening zone. The minimum of micro-hardness occurs on the TMAZ/HAZ transition zone of the advancing side. The tensile strength of weld reaches 85.8% of base mental, fracture occurs in the TMAZ/HAZ transition zone, and the fracture morphology is dimple.

关 键 词：7A52铝合金 搅拌摩擦焊接 微观组织 力学特性 

分 类 号：TG44[金属学及工艺—焊接]