Journal of South China University of Technology (Natural Science Edition) ›› 2010, Vol. 38 ›› Issue (11): 12-16.doi: 10.3969/j.issn.1000-565X.2010.11.003

• Materials Science & Technology • Previous Articles     Next Articles

Microstructures and Mechanical Properties of Welding Zone of 7022 Aluminium Alloy After Friction Stir Welding

Wang Hong-feng1  Zuo Dun-wen1  Wang Min1  Li Guang2  Dong Chun-lin2   

  1. 1.College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,Jiangsu,China;2.Beijing Aeronautical Manufacturing Technology Research Institute,Beijing 100024,China
  • Received:2010-02-25 Revised:2010-05-28 Online:2010-11-25 Published:2010-11-25
  • Contact: 左敦稳（1962-），男，教授，博士生导师，主要从事智能加工技术、搅拌摩擦焊技术、抗疲劳加工技术等研究E—mail：imit505@nuaa．edu．cn E-mail:wanghnfeng@163．com
  • About author:汪洪峰（1978-），男，博士生，主要从事智能加工技术研究．
  • Supported by:

    国家自然科学基金资助项目（50675104）; 江苏省研究生创新基金资助项目（CX09B_073Z）

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Abstract:

7022 aluminium alloy with a thickness of 10 mm was welded via the friction stir welding,and the influences of welding parameters on the microstructures and mechanical properties of the welded joint were investigated.The results show that,at a rotating speed of 400 r/min and a welding speed of 100 mm/min,the tensile strength and yield strength of the welded joint of 7022 aluminium alloy reach 615 MPa and 533 MPa,respectively,which are both greater than those of the base material,and that the microhardness of the welded joint is slightly lower than that of the base material.Moreover,it is found from the fracture surface analyses,it is found that the tensile fracture of the welded joint of 7022 aluminium alloy is ductile.

Key words: friction stir welding, 7022 aluminium alloy, microstructure, mechanical property, fracture morphology