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논문 기본 정보

자료유형
학술저널
저자정보
J. G. Jeon (Yonsei University) Sangjun Lee (Yonsei University) K. M. Choi (Yonsei University) H. Kang (Korea Institute of Industrial Technology) W. C. Kim (Yonsei University) J. H. Jeon (Yonsei University) D. H. Bae (Yonsei University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.29 No.6
발행연도
2023.6
수록면
1,684 - 1,698 (15page)
DOI
10.1007/s12540-022-01332-3

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초록· 키워드

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The recrystallization behavior of cold-rolled Al–Zn–Mg–Cu-based alloy sheets was systematically investigated by varyingthe Cu and Mg contents. With increasing Cu and Mg contents, the recrystallized grain size was reduced from 54.9 to23.3 μ m owing to the reduced ratio of the size to volume fraction of microscale particles. Interestingly, the sensitivity ofdifferent particles to particle-stimulated nucleation (PSN), which is reflected by the linear experimental coefficient (k), wasdependent on their morphologies and relative fractions. The k value was considerably small (0.07) in the Cu-free alloys,implying that the Zn and Mg containing particles have an insignificant effect on the PSN. However, the k value increasedsignificantly to 0.61 with the increase in Cu content to 1.3 wt%, because the rod-shaped Al7Cu2Feparticles formed a largeplastic deformation zone around them. The addition of 2.0 wt% Mg led to the increase in the relative fraction of round-shapedAl2CuMgparticles, increasing the k value from 0.46 to 0.86. The Al7Cu2Feparticles were a stronger source of PSN thanthe Al2CuMgparticles, forming more recrystallized grains. Although Mg addition could increase the yield strength of theaged sheets, a strength–ductility trade-off arose. However, the addition of Cu simultaneously increased the yield strengthand elongation because the uniform distribution of grain boundary precipitates caused by grain refinement could reduce thestress concentration during plastic deformation.

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