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刘敬萱,沈健,李锡武,闫丽珍,闫宏伟,刘红伟,温凯,李志辉,张永安,熊柏青.不同焊接速度6005A-T5铝合金搅拌摩擦焊接头的组织演变及力学性能研究[J].稀有金属材料与工程(英文),2019,48(12):3797~3805.[liujingxuan,Shenjian,Lixiwu,Yanlizhen,Yanhongwei,Liuhongwei,Wenkai,Lizhihui,Zhangyongan and Xiongbaiqing.Study on the microstructure evolution and mechanical properties of 6005A-T5 aluminum alloy FSW welded joints with different welding speeds[J].Rare Metal Materials and Engineering,2019,48(12):3797~3805.]
Study on the microstructure evolution and mechanical properties of 6005A-T5 aluminum alloy FSW welded joints with different welding speeds
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Received:May 22, 2019  Revised:November 04, 2019
DOI:
Key words: aluminum alloy  friction stir welding  microstructure  mechanical properties  residual stress  
Foundation item:国家重点研发项目(2016YFB0300905, 2016YFB0300902)
Author NameAffiliation
liujingxuan,Shenjian,Lixiwu,Yanlizhen,Yanhongwei,Liuhongwei,Wenkai,Lizhihui,Zhangyongan and Xiongbaiqing  
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Abstract:
      The 6005A-T5 aluminum alloy welded joints are prepared by use of friction stir welding (FSW) at different welding speeds. The microstructure and mechanical properties of these joints have been investigated. The relationship between evolution of precipitates in different regions and the mechanical properties of welded joints is established. The β″ phases completely dissolve back into the aluminum matrix due to enough welding heat input in nugget zone (NZ) during the welding processing. GP zones are formed during the subsequent natural aging, which results in the hardness recovery of NZ. Incomplete recrystallization occurs in the ther-mo-mechanically affected zone (TMAZ), and the grains are elongated with high dislocation density. The heat affected zone (HAZ) contains Q" and β″ phases. With the decrease of welding speed, β″ phase gradually disappears and Q" phase is formed, which leads to a decrease in the strength of welded joints. The average value of longitudinal residual stress is higher than that of transverse residual stress. With the increase of welding speed, the peak longitudinal residual tensile stress increases, but the effect on the transverse residual tensile stress is negligible.