Effect of post-weld natural aging on mechanical and microstructural properties of friction stir welded 6063-T4 aluminium alloy |
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| Affiliation: | 1. School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;2. Light Alloy Research Institute of Central South University, Changsha 410083, China;3. State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, China;1. School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;2. State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, China;3. Key Laboratory of Pressure Systems and Safety, Ministry of Education, East China University of Science and Technology, Shanghai 200237, China;1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110004, PR China;2. Laboratory for Excellence in Advanced Steel Research, Department of Metallurgical, Materials and Biomedical Engineering, University of Texas at El Paso, El Paso, TX, 79968-0521, USA;1. School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;2. State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, China;3. Key Laboratory of Pressure Systems and Safety, Ministry of Education, East China University of Science and Technology, Shanghai 200237, China;4. State Key Laboratory of Material Processing and Die & Mould Technology, Wuhan 430074, China |
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| Abstract: | Influence of natural aging on mechanical and microstructural properties of friction stir welded 6063-T4 aluminium alloy plates was investigated through mechanical testing, X-ray diffraction studies, and transmission electron microscopy, for aging times up to 8640 h. Mg–Si co-clusters formed during the natural aging process resulted in an increase in strength, decrease in ductility, and occurrence of serrated plastic flow. Hardness increase from aging was fastest in welds obtained at higher tool rotational speeds due to greater amount of “quenched-in” vacancies from higher peak stir zone temperatures. Peak broadening analyses and classical Williamson–Hall plots were used to investigate the effect of friction stir welding and post weld natural aging on microstrain in different weld regions. Higher microstrain was found in stir zone as well as heat affected zone as compared to that for base metal, albeit for different reasons. |
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