2024/7075异种铝合金搅拌摩擦焊的晶体取向演化  

Crystal orientation evolution of friction stir welding of 2024/7075 dissimilar aluminum alloys

作　　者：周俊[1,2] 张津[1,2] 计鹏飞[1,2] 

机构地区：[1]北京科技大学新材料技术研究院,北京100083 [2]北京市腐蚀磨蚀与表面技术重点实验室,北京100083

出　　处：《焊接学报》2016年第8期59-62,131-132,共4页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51275037)

摘　　要：使用光学显微镜、电子背散射衍射(EBSD)对比研究了2024/7075异种铝合金搅拌摩擦焊(FSW)接头及母材的组织特征、晶界特征和织构的演化.结果表明,后退侧热力影响区晶粒的小角度晶界含量较母材明显增大而前进侧热力影响区晶粒的小角度晶界含量与母材相比没有明显变化,焊核区发生了动态再结晶,大角度晶界含量明显增加.后退侧2024铝合金为弱取向组织,前进侧7075铝合金母材、热影响区以及热力影响区具有较强的S织构{123}<634>、黄铜织构{011}<211>和R织构{124}<211>,焊核区为等轴再结晶晶粒,没有明显的择优取向.The optical microscope and electron back scattering diffraction( EBSD) were used to comparative study the microstructure features,grain boundary characteristics and the evolution of the texture in friction stir weldedjoint and base metalof2024 / 7075 dissimilar aluminum alloys. The results show that the content of low angle grain boundaryin thermal mechanical affected zoneat retreating side grain is significantly higher than that of the base metal,but there is no obvious change at advancing side. Dynamic recrystallization occurrs in stir zone,and the content of high angle grain boundary increases significantly. 2024 aluminum alloy at retreating side has a weak orientation. 7075base metal at advancing side,heat affected zone and heat mechanically affected zone have strong S texture { 123 } < 634 >,brass texture { 011} < 211 > and R texture { 124} < 211 >. Stir zone is equiaxed recrystallization grain,and has no obvious preferred orientation.

关 键 词：异种铝合金 搅拌摩擦焊 晶体取向演化 电子背散射衍射 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG401[金属学及工艺—金属材料]