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Vol.43, No.8, 511 ~ 519, 2005
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| Title |
| Effect of Sc and Zr Addition on the Formation of Ultra Fine Grain during Warm Multiple Deformation in Al-Mg Alloy |
| 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 evolutions of microstructure and mechanical properties during warm multiple deformation (WMD) at 673 K and a strain rate of 10^(-1) sec were investigated for Al-3 wt%Mg (A3M) alloy and Al-3 wt%Mg-0.2 wt%Sc-0.l wt%Zr (A3MSZ) alloy. When the WMD process was repeated up to 8 cycles at 673 K for the A3MSZ alloy, ultra-fine grained structure having mean grain size less than 3 μm was obtained and most grain boundaries consisted of high angle grain boundaries. However, A3M alloy showed grain growth behavior rather than grain refinement during the WMD process, which was originated from the lack of fine particles to prohibit the grain growth. In the ultra-fine grained A3MSZ alloy fabricated by WMD process, the maximum elongation to failure was 510% and the corresponding strain rate sensitivity, m, was about 0.4754 when tensile test was performed at 673K and a strain rate of 10^(-3) / sec. |
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| Key Words |
| Warm multiple deformation, Dynamic recrystallization, Superplasticity |
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