Study on properties of aluminum alloy welded by friction stir welding

2019 International Conference on Advanced Electronic Materials, Computers and Materials Engineering

无线电电子学;计算机科学;材料科学

Luo, Chuanhong^1^2 ; Zhang, Jianqiang^1^2 ; Wen, Jungang^1^2

School of Power and Mechanical Engineering, Wuhan University, Wuhan

430072, China^1

Key Laboratory of Hydraulic Machinery Transients, Wuhan University, Ministry of Education, Wuhan

430072, China^2

关键词: 2219 aluminum alloys;    Base metals;    Fine grains;    High-temperature oscillations;    Microstructure and mechanical properties;    Research results;    Strength reduction;    Welded plates;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/563/2/022038/pdf
DOI  :  10.1088/1757-899X/563/2/022038

来源: IOP

【 摘 要 】

In order to meet the special requirements of aerospace industry for materials of aluminum alloy, the precisely controlled heat treatment was studied. The 2219 aluminum alloy welded plate was prepared by friction stir welding, and its microstructure and mechanical properties were studied correspondingly. The reasons for strength reduction of welded joints are analyzed and summarized. The research results showed that the average tensile strength of the welded joints increased to 393 Mpa and the elongation increased to 12.6% of the base metal. With the special recrystallization technology of high temperature oscillation heat treatment, the fine grains can be maintained, the plasticity of aluminum alloy can be restored, which means that the softening problem can be eliminated and the mechanical strength can be improved.