Effect of post weld heat treatment on tensile properties and microstructure characteristics of friction stir welded armour grade AA7075-T651aluminium alloy  

作　　者：P.SIVARAJ D.KANAGARAJAN V.BALASUBRAMANIAN 

机构地区：[1]Department of Manufacturing Engineering, Annamalai University [2]Centre for Materials Joining & Research, Department of Manufacturing Engineering, Annamalai University

出　　处：《Defence Technology（防务技术）》2014年第1期1-8,共8页Defence Technology

摘　　要：This paper reports the effects of post weld heat treatments, namely artificial ageing and solution treatment followed by artificial ageing, on microstructure and mechanical properties of 12 mm thick friction stir welded joints of precipitation hardenable high strength armour grade AA7075-T651 aluminium alloy. The tensile properties, such as yield strength, tensile strength, elongation and notch tensile strength, are evaluated and correlated with the microhardness and microstructural features. The scanning electron microscope is used to characterie the fracture surfaces. The solution treatment followed by ageing heat treatment cycle is found to be marginally beneficial in improving the tensile properties of friction stir welds of AA7075-T651 aluminium alloy.This paper reports the effects of post weld heat treatments, namely artificial ageing and solution treatment followed by artificial ageing, on microstructure and mechanical properties of 12 mm thick friction stir welded joints of precipitation hardenable high strength armour grade AA7075-T651 aluminium alloy. The tensile properties, such as yield strength, tensile strength, elongation and notch tensile strength, are evaluated and correlated with the microhardness and microstructural features. The scanning electron microscope is used to characterie the fracture surfaces. The solution treatment followed by ageing heat treatment cycle is found to be marginally beneficial in improving the tensile properties of friction stir welds of AA7075-T651 aluminium alloy.

关 键 词：搅拌摩擦焊 铝合金接头 焊后热处理 微观结构 拉伸性能 装甲 扫描电子显微镜 焊接 

分 类 号：TG441.8[金属学及工艺—焊接]