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Effect of strain-induced precipitation on the low angle grain boundary in AA7050 aluminum alloy
Highlights ► Experimental two-pass deformation process is different from conventional rolling. ► Globular precipitates were accelerated to produce by first-pass deformation. ► Second-pass deformation produced low angle grain boundaries owing to precipitates. ► Microstructure with numerous sub-structures had increased strength and ductility.
Abstract Effects of the particles induced by strain on dynamic recrystallization and microstructure of the AA7050 aluminum alloy were investigated during hot deformation using X-ray diffraction (XRD), transmission electron microscopy (TEM) and electron back-scattered diffraction (EBSD). Experimental results showed that partial recrystallized grains containing little sub-structure were produced during the solution treatment. Numerous particles were successfully obtained by the strain-induced precipitation during first-pass deformation at 573K. The deformation promoted spheroidization and refinement of the precipitate particles. Then these particles pinned dislocations and grain boundaries inhibiting dynamic recrystallization during second-pass high-temperature deformation at 673K and low angle grain boundary fraction was increased significantly to 83.8%. Furthermore, the tensile test indicated that microstructure with numerous low angle boundaries (LAGBs) and 5μm sub-grains had increased the strength and ductility of the AA7050 aluminum alloy.
Effect of strain-induced precipitation on the low angle grain boundary in AA7050 aluminum alloy
Highlights ► Experimental two-pass deformation process is different from conventional rolling. ► Globular precipitates were accelerated to produce by first-pass deformation. ► Second-pass deformation produced low angle grain boundaries owing to precipitates. ► Microstructure with numerous sub-structures had increased strength and ductility.
Abstract Effects of the particles induced by strain on dynamic recrystallization and microstructure of the AA7050 aluminum alloy were investigated during hot deformation using X-ray diffraction (XRD), transmission electron microscopy (TEM) and electron back-scattered diffraction (EBSD). Experimental results showed that partial recrystallized grains containing little sub-structure were produced during the solution treatment. Numerous particles were successfully obtained by the strain-induced precipitation during first-pass deformation at 573K. The deformation promoted spheroidization and refinement of the precipitate particles. Then these particles pinned dislocations and grain boundaries inhibiting dynamic recrystallization during second-pass high-temperature deformation at 673K and low angle grain boundary fraction was increased significantly to 83.8%. Furthermore, the tensile test indicated that microstructure with numerous low angle boundaries (LAGBs) and 5μm sub-grains had increased the strength and ductility of the AA7050 aluminum alloy.
Effect of strain-induced precipitation on the low angle grain boundary in AA7050 aluminum alloy
Lang, Yujing (author) / Cai, Yuanhua (author) / Cui, Hua (author) / Zhang, Jishan (author)
2011-04-14
6 pages
Article (Journal)
Electronic Resource
English
Effect of strain-induced precipitation on the low angle grain boundary in AA7050 aluminum alloy
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