Microstructural evolution ahead of the tool in aluminum friction stir welds |
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| Affiliation: | 1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, PR China;2. College of Engineering, University of Kentucky, Lexington, KY 40506, USA;1. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong university, Shanghai 200240, PR China;2. Institute of Nuclear Physics and Chemistry, Mianyang 621900, PR China;3. SMS Materials Center, CNRS UMR 5146, Ecole des mines de Saint Etienne, 158, cours Fauriel, 42023 Saint Etienne, France;4. Unité Matériaux et Transformations, CNRS UMR 8207, Université Lille 1, Villeneuve d''Ascq 59655, France;5. School of Materials Science and Engineering, Shanghai Jiao Tong university, Shanghai 200240, PR China |
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| Abstract: | The microstructural evolution around the tool during friction stir-welding of aluminum is described. The rotating tool induces a gradual rotation of the crystal lattice with a concomitant development of elongated subgrains. Additional small subgrains form within this structure by continuous dynamic recrystallization, gradually increasing in misorientation, eventually developing high-angle (>15°) grain boundaries. The development of texture and similarities to friction stir welds in titanium alloys are also discussed. |
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