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Science and Technology of Welding and Joining Volume 28, 2023 - Issue 2
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Research Article

The material flow and texture-weakening mechanism in double-sided friction stir welded Mg alloy

Meng-ran Zhoua Joining and Welding Research Institute (JWRI), Osaka University, Osaka, Japan;b Department of Mechanical Engineering, Tsinghua University, Beijing, People’s Republic of China;c The State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing, People’s Republic of China;d Key Laboratory for Advanced Materials Processing Technology Ministry of Education of China, Tsinghua University, Beijing, People’s Republic of ChinaCorrespondence[email protected]
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Yu-feng Suna Joining and Welding Research Institute (JWRI), Osaka University, Osaka, Japan;e School of materials science and engineering, Zhengzhou University, Zhengzhou, People’s Republic of ChinaView further author information
,
Yoshiaki Morisadaa Joining and Welding Research Institute (JWRI), Osaka University, Osaka, JapanView further author information
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Qing-yu Shia Joining and Welding Research Institute (JWRI), Osaka University, Osaka, Japan;b Department of Mechanical Engineering, Tsinghua University, Beijing, People’s Republic of China;c The State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing, People’s Republic of ChinaView further author information
&
Hidetoshi Fujiia Joining and Welding Research Institute (JWRI), Osaka University, Osaka, JapanCorrespondence[email protected]
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Pages 154-161 | Received 10 Feb 2022, Accepted 19 Oct 2022, Published online: 04 Nov 2022
 
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Abstract

In conventional friction stir welding of magnesium alloys, a strong (0001) texture at the welded zone is inevitable, which deteriorates the joint mechanical properties. A novel method called ‘double-sided friction stir welding’ solved this problem by weakening the texture. However, the texture-weakening mechanism remains unclear. In this study, the mechanism of the texture weakening in double-sided friction stir welded Mg alloy was systematically analysed. The welding temperature and the material flow mode were revealed to control the (0001) texture randomisation simultaneously. The unique material flow at the mid-thickness layer caused by the double-sided friction stir welding was revealed to match the ‘beat phenomenon’ for the first time, which was revealed as the dominant mechanism for the (0001) texture randomisation.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This study was partly supported by the New Energy and Industrial Technology Development Organization (NEDO) under the ‘Innovation Structural Materials Project (Future Pioneering Projects)’.

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