Superplastic deformation behavior of ultra-fine-grained 5083 Al alloy using load-relaxation tests
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SCOPUS
- Title
- Superplastic deformation behavior of ultra-fine-grained 5083 Al alloy using load-relaxation tests
- Authors
- Ko, YG; Shin, DH; Park, KT; Lee, CS
- Date Issued
- 2007-03-25
- Publisher
- ELSEVIER SCIENCE SA
- Abstract
- In this study, superplastic deformation behavior of ultra-fine-grained (UFG) 5083 Al alloy was investigated in the context of inelastic deformation theory. By imposing an effective strain of 8 via equal-channel angular pressings, most of the grains were significantly refined to 0.3 mu m with non-equilibrium boundaries. A series of tension and load-relaxation tests was carried out to measure elongations and to obtain flow curves of UFG alloy at strain rates of 10(-4) to 10(-2) s(-1) and at temperatures of 498-548 K corresponding to 0.58-0.65 T-m. The UFG alloy exhibited much higher elongations than the coarse grain alloy at the same temperatures and strain rates, indicating that low-temperature superplasticity was achieved by UFG alloy in spite of its non-equilibrium grain boundaries. Quantitative analysis on deformation mechanisms of UFG alloy was made and compared with those of coarse grain alloy. (c) 2006 Elsevier B.V. All rights reserved.
- Keywords
- 5083 Al alloy; ultra-fine grain; equal-channel angular pressing; superplasticity; internal variable model; LOW-TEMPERATURE SUPERPLASTICITY; SEVERE PLASTIC-DEFORMATION; STRUCTURAL SUPERPLASTICITY; MAGNESIUM ALLOY; TI-6AL-4V ALLOY; MICROSTRUCTURE
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/23478
- DOI
- 10.1016/j.msea.2006.02.452
- ISSN
- 0921-5093
- Article Type
- Article
- Citation
- MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, vol. 449, page. 756 - 760, 2007-03-25
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