발간논문

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Vol.39, No.5, 553 ~ 560, 2001
Title
Mechanical Behaviors : Microstructure and Mechanical Properties of 5083 Aluminum Alloy Processed by Equal Channel Angular Pressing at Elevated Temperature
강효경Hyo Gyoung Kang , L . Bachelard , 김향욱Hyoung Wook Kim , 강석봉Suk Bong Kang
Abstract
The microstructure and mechanical properties have been investigated on a commercial 5083 aluminum alloy processed by the equal-channel angular pressing (ECAP) at 473K. The microstructure of a single pass sample consisted of elongated subgrains. Increasing the number of pass led to very fine equilibrium grains having high angle grain boundaries. The 0.2% yield stress and hardness after a single pass increased greatly, and then kept constant with additional straining. On the other hand, the elongation to failure of a single pass sample decreased a little to compare with sample before ECAP, but there was no further reduction with additional straining. Recrystallization partially occurred in ECAPed 5083 aluminum alloy when annealed at 523K for 1 hr, and completely finished when annealed only at 573K for 1 hr. With increasing the number of pass, the onset temperature of recrystallization decreased and the rate of softening increased.
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