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Effects of postweld aging on the microstructure and properties of bobbin tool friction stir-welded 6082-T6 aluminum alloy

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International Journal of Minerals,Metallurgy and Materials 2019年第7期26卷 849-857页

作者： Yu-peng Li Da-qian Sun Wen-biao Gong Liang Liu Key Laboratory of Automobile Materials Ministry of Education Jilin University Changchun 130025 China School of Materials Science and Engineering Jilin University Changchun 130025 China Key Laboratory of Advanced Structural Materials Ministry of Education Changchun University of Technology Changchun 130012 China School of Materials Science and Engineering Changchun University of Technology Changchun 130012 China

Samples of 6082-T6 aluminum alloy were subjected to bobbin tool friction stir welding (BT-FSW), and the joints were treated by postweld natural aging (PWNA) and postweld artificial aging (PWAA). The microstructure, microhardness, and tensile properties of the aged and as-welded specimens were investigated. Transmission electron microscopy (TEM) observations revealed that a large number of Guinier–Preston (GP) zones precipitated in the form of a network on the stir zone (SZ) after PWNA for 60 d, and a large number of β'' phases precipitated in the matrix for after PWAA for 6 h. As the aging time increased, the microhardness of the SZ and the thermomechanically affected zone (TMAZ) increased significantly, and the hardness of the SZ after PWAA for 6 h was close to that of the base metal (BM). With increasing PWNA time, the strength and strain increased slightly. When the PWAA time increased, the strength clearly increased, with a maximum value of 279.9 MPa after 6 h, while the strain decreased.

关键词： postweld aging aluminum alloys bobbin tool friction stir welding microstructure properties

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Research Progress of bobbin Tool Friction Stir Welding of Aluminum Alloys:A Review

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Acta Metallurgica Sinica(English Letters) 2020年第1期33卷 13-29页

作者： Guo-Qing Wang Yan-Hua Zhao Ying-Ying Tang China Academy of Launch Vehicle Technology Beijing 100076China Capital Aerospace Machinery Company Beijing 100076China

bobbin tool friction stir welding(BT-FSW)is a variant of conventional friction stir welding(FSW).It can be used to weld complex curvature structures and closed sections by adding an extra shoulder instead of a rigid backing anvil,which expands the potential application of FSW in aerospace,railway,automotive and marine ***-FSW has some signifi cant advantages over conventional FSW such as no root fl aws,full weld penetration,low stiff ness requirements for machines and fi xtures,balanced heat input,lower distortion and thus has broad prospects for *** present,there have been numerous research reports on BT-FSW,but its widespread use is still restricted due to various factors such as tool life,process stability,control complexity and implementation *** this paper,the domestic and foreign research progress of BT-FSW is reviewed from four aspects of bobbin tool design and classifi cation,temperature fi eld and fl ow fi eld during welding,microstructure and mechanical properties of welded joints as well as industrial application,and then the possible research hotspots of BT-FSW in the future are pointed *** paper mainly aims to help researchers have a comprehensive and in-depth understanding of BT-FSW.

关键词： bobbin tool Temperature field Flow field Microstructure Mechanical properties Application

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