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Vol.43, No.6, 461 ~ 469, 2005
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| Title |
| Effect of Deformation Route on the Microstructure and Mechanical Properties of AA 5083 Alloy Processed by Warm Multiple Deformation |
| 김재운 Jae Woon Kim , 민복기 Bok Ki Min , 김형욱 Hyoung Wook Kim , 강석봉 Suk Bong Kang , 박익민 Ik Min Park |
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| Abstract |
| The microstructures and mechanical properties of AA5083 alloys processed by warm multiple deformation at different temperatures of 573 K, 623 K, and 673 K were investigated. The Annealed AA5083 plates were compressed at a strain rate of 0.l/sec by two deformation routes, that is, route A and route B. Route A is to rotate the specimen throughout 90˚ around the vertical axis of loading direction at every passes. Route B is to rotate the specimen throughout 90˚ around the parallel axis of loading direction and then rotate it again as route A. The specimen warm-multiple deformed by route B showed finer grain size and more uniform distribution of grain than those processed by route A. When the warm multiple deformation process was repeated up to 8 passes at 673 K, the specimen consisted of ultrafine grained structure with the average grain size less than 4 μm. The superplastic properties can be obtained at the strain rates of 0.01/sec to 0.001/sec at 673 K. The maximum elongation to failure and the corresponding strain rate sensitivity, m, were 450% and about 0.44, respectively. |
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| Key Words |
| Warm multiple deformation, Dynamic recrystallization, Deformation route, Superplasticity, AA5083 |
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