期刊
MATERIALS & DESIGN
卷 32, 期 8-9, 页码 4241-4246出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2011.04.025
关键词
Non-ferrous metals and alloys; Mechanical; Microstructure
资金
- State Key Laboratory for Advanced Metals and Materials of China
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 573 K. 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 673 K 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 5 mu m sub-grains had increased the strength and ductility of the AA7050 aluminum alloy. (C) 2011 Elsevier Ltd. All rights reserved.
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