Journal
MATERIALS CHARACTERIZATION
Volume 146, Issue -, Pages 159-168Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2018.09.043
Keywords
Friction stir welding; Initial temper; Mechanical properties; Precipitation; 7XXX Al alloy
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Funding
- National Key Research and Development Program of China [2016YFB0300901, 2016YFB0300902]
- Shenghua Yuying Project of Central South University [20130603]
- China Scholarship Council Program [201706375013]
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AA 7055-T6 and AA 7055-T4 aluminium alloy sheets were friction stir welded to investigate the impact of initial base metal temper on microstructure, hardness and tensile properties of the joints. In the joint of alloy in T6 temper (T6-joint), the hardness of the weld zone is lower than that of base metal; in the joint of alloy in T4 temper (T4-joint), however, some regions in the heat affected zone exhibit higher hardness than base metal. The weld nugget zone in T6-joint exhibits slightly lower hardness compared with that in T4-joint. The hardness minima is slightly higher in T4-joint than in T6-joint. T4-joint exhibits higher yield strength, ultimate tensile strength and elongation compared with T6-joint. Based on microstructure examination by transmission electron microscopy, the impact of initial precipitate state on precipitation behavior in the weld nugget zone, thermo-mechanically affected zone and heat affected zone during friction stir welding and mechanical properties of the joints is discussed.
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