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Vol.46, No.9, 563 ~ 572, 2008
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| Title |
| Effect of Annealing Temperature on Dynamic Deformation Behavior of Ultra-Fine-Grained Aluminum Alloys Fabricated by Equal Channel Angular Pressing |
| 김양곤 Yang Gon Kim , 고영건 Young Gun Ko , 신동혁 Dong Hyuk Shin , 이종수 Chong Soo Lee , 이성학 Sung Hak Lee |
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| Abstract |
| The influence of annealing treatment on dynamic deformation behavior of ultra-fine grained aluminum alloys was investigated in this study. After equal-channel angular pressing at 200℃, most of the grains were considerably reduced to nearly equiaxed grains of 0.3 ㎛ in size. With an increment of various annealing treatments for 1 hour, resultant microstructures were found to be fairly stable at temperatures up to 200℃, suggesting that static recovery would be dominantly operative, whereas grain growth was pronounced above 250℃. The tensile test results showed that yield and ultimate tensile strengths decreased, but elongation-to-failure and strain hardening rate increased with increasing annealing temperature. The dynamic deformation behavior retrieved with a series of torsional tests was explored with respect to annealed microstructures. Such mechanical response was analyzed in relation to resultant microstructure and fracture mode. |
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| Key Words |
| Aluminum alloy, ultra-fine grained structure, annealing, dynamic torsional test |
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