Study on the microstructure in a friction stir welded 2519-T87 Al alloy |
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| Affiliation: | 1. Key Laboratory of Nonferrous Metallic Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, PR China;2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, PR China;3. Xin Jiang Joinworld Co., Ltd., Urumqi 830013, PR China;1. Mechanical & Automotive Engineering, Faculty of Engineering and Computing, Coventry University, Priory Street, Coventry, UK;2. Dublin Institute of Technology, Centre for Elastomer Research (CER), Lurgan Street, Dublin 1, Ireland;3. School of Engineering and Applied Science, Aston University, Aston Triangle, Birmingham, UK;1. Hunan Key Laboratory for Super-Microstructure and Ultrafast Process, School of Physics and Electronics, Central South University, Changsha 410083, China;2. School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China;3. Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA;1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;3. School of Metallurgy and Environment, Central South University, Changsha 410083, China;1. College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, China;2. Collaborative Innovation Center of Resource-conserving & Environment-friendly Society and Ecological Civilization, Changsha, Hunan 410083, China |
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| Abstract: | The microhardness, grain size and distribution of the precipitates in various zones of a 2519-T87 aluminum alloy welded joint welded by friction stir welded were investigated. The dynamic recrystallization occurred in the weld nugget zone and the size of recrystallized grains was smaller than that in the thermo-mechanically affected zone, besides, θ′ and θ phase precipitated. The thermo-mechanically affected zone was divided into three ones: the zone close to the thermo-mechanically affected zone, where coarse θ′ precipitates were observed; the middle zone, where the mainly θ precipitates appeared; and the zone close to the heat-affected zone, where both thin θ′ and θ precipitates were observed. In the heat-affected zone, the size of θ′ precipitates was less than those in the base metal zone. On the transverse cross-section of welded joint the microhardness curve shows a W-shape. |
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