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HE Fangzhou1, YANG Xinqi1, LI Dongxiao2, CUI Lei1. Effect of microstructural inhomogeneity on mechanical properties of stationary shoulder friction stir welded joints for 6061-T6 aluminum alloy[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2017, 38(8): 115-118. DOI: 10.12073/j.hjxb.20150808004
Citation: HE Fangzhou1, YANG Xinqi1, LI Dongxiao2, CUI Lei1. Effect of microstructural inhomogeneity on mechanical properties of stationary shoulder friction stir welded joints for 6061-T6 aluminum alloy[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2017, 38(8): 115-118. DOI: 10.12073/j.hjxb.20150808004
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Effect of microstructural inhomogeneity on mechanical properties of stationary shoulder friction stir welded joints for 6061-T6 aluminum alloy

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  • Received Date: August 07, 2015
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  • The relationship between microstructural inhomogeneity and mechanical properties of the stationary shoulder friction stir welded (SSFSW) joint for 6061-T6 aluminum alloy was investigated. Results show that there is existing obviously microstructural inhomogeneity in the SSFSW joints, which reflected in the different grain size and shape, morphology and distribution of precipitates. It should be noted that the different precipitates is the major factor of the mechanical properties variation. Resulting from the microstructural inhomogeneity, the HAZ which is closed to the NZ was softened seriously, and its hardness and tensile strength were the lowest in the joint, reaching at 60% and 72% of the base metal, respectively. The strength and plasticity of the NZ are the best in the joint because of the precipitation strengthening and finegrain strengthening, and the tensile strength and elongation of the NZ reach at 88% and 215% of base metal, respectively. With the distance from NZ increasing, the ultimate tensile strength and yield strength of microtensile specimens increase, while the elongation of samples decreases.
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  • Gibsona B T, Lammlein D H, Prater T J,etal. Strauss friction stir welding: process, automation, and control[J]. Journal of Manufacturing Processes, 2014(16): 56-73.[2] 刘会杰, 李金全, 段卫军. 静止轴肩搅拌摩擦焊的研究进展[J]. 焊接学报, 2012, 33 (5): 108-112. Liu Huijie, Li Jinquan, Duang Weijun. Progress in the stationary shoulder friction stir welding[J]. Transactions of the China Welding Institution, 2012, 33(5): 108-112.[3] 白景彬, 杜岩峰, 田志杰, 等. 2219铝合金搅拌摩擦焊接头组织与力学性能的不均匀性[C]∥第十六次全国焊接学术会议论文摘要集, 江苏： 2011.[4] 张 昭, 刘亚丽, 陈金涛, 等. 搅拌摩擦焊接过程中材料流动形式[J]. 焊接学报, 2007, 28 (11): 17-21. Zhang Zhao, Liu Yali, Chen Jintao,etal. Material flow patterns in friction stir welding[J]. Transactions of the China Welding Institution, 2007, 28(11): 17-21.[5] Li D X, Yang X Q, Cui L,etal. Effect of welding parameters on microstructure and mechanical properties of AA6061-T6 butt welded joints by stationary shoulder friction stir welding[J]. Materials and Design, 2014(64): 251-260.
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