期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2008.11.016
关键词
Superplasticity; Friction stir processing; Aluminum alloy; Overlapping
类别
资金
- National Outstanding Young Scientist Foundation [50525103]
- National Natural Science Foundation of China [50671103, 50871111]
- Chinese Academy of Sciences
- National Science Foundation [DMI-0076433, 0323725]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [0323725] Funding Source: National Science Foundation
Effect of overlapping passes on the microstructure and superplastic behavior of friction stir processed (FSP) 7075Al was subjected to a detailed investigation. Overlapping passes exerted no obvious effect on the size of recrystallized grains. Both single and two-pass FSP 7075Al exhibited similar grain sizes of 5.4-5.7 mu m. Compared to single-pass FSP, two-pass FSP resulted in an enhancement in superplastic elongation and a change in superplastic response. A shift to higher optimum temperature was observed in the two-pass FSP 7075Al. Furthermore, overlapping passes led to a shift to higher optimum strain rate in the center region of second pass in the two-pass FSP 7075Al. Maximum superplastic elongation of 1220% was achieved at 480 degrees C and an initial strain rate of 1 x 10(-2) s(-1) in the center region of second pass in the two-pass FSP 7075Al. Analyses of superplastic data indicated that grain boundary sliding is the main superplastic deformation mechanism for both single and two-pass FSP 7075Al. (C) 2008 Elsevier B.V. All rights reserved.
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