TY - GEN
T1 - Effect of directional grain structure and strain rate on impact properties and dislocation substructure of 6061-T6 aluminum alloy
AU - Lee, Woei Shyan
AU - Liu, Mao Hung
N1 - Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2015
Y1 - 2015
N2 - The effect of directional grain structure and strain rate on the impact properties and dislocation substructure of 6061-T6 aluminum alloy is studied. Impact tests are performed at strain rates ranging from 1x103 to 5x103s-1 using a split Hopkinson pressure bar system. Cylindrical specimens are prepared from the rolled plates in longitudinal direction, transverse direction and through-thickness direction, respectively. The results show that the flow stress is strongly dependent on the strain rate and displays complex variations with grain structure direction. The flow stress increases with increasing strain rate. For all tested strain rates, the flow stress is the highest in the transverse specimen, followed by the through-thickness specimen and longitudinal specimen. However, at the strain rate of 5×102s-1, the flow stress in longitudinal specimen is higher than that in through-thickness specimen due to the change of dislocation multiplication rate. The plastic flow occurs within the deformation regions, and becomes more pronounced at high strain rates, especially for the longitudinal specimen. Dislocation density increases markedly with increasing strain rate. Strengthening effect is the highest in the transverse specimen, followed by the longitudinal specimen and through-thickness specimen.
AB - The effect of directional grain structure and strain rate on the impact properties and dislocation substructure of 6061-T6 aluminum alloy is studied. Impact tests are performed at strain rates ranging from 1x103 to 5x103s-1 using a split Hopkinson pressure bar system. Cylindrical specimens are prepared from the rolled plates in longitudinal direction, transverse direction and through-thickness direction, respectively. The results show that the flow stress is strongly dependent on the strain rate and displays complex variations with grain structure direction. The flow stress increases with increasing strain rate. For all tested strain rates, the flow stress is the highest in the transverse specimen, followed by the through-thickness specimen and longitudinal specimen. However, at the strain rate of 5×102s-1, the flow stress in longitudinal specimen is higher than that in through-thickness specimen due to the change of dislocation multiplication rate. The plastic flow occurs within the deformation regions, and becomes more pronounced at high strain rates, especially for the longitudinal specimen. Dislocation density increases markedly with increasing strain rate. Strengthening effect is the highest in the transverse specimen, followed by the longitudinal specimen and through-thickness specimen.
UR - http://www.scopus.com/inward/record.url?scp=84907087518&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84907087518&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/KEM.626.50
DO - 10.4028/www.scientific.net/KEM.626.50
M3 - Conference contribution
AN - SCOPUS:84907087518
SN - 9783038352266
T3 - Key Engineering Materials
SP - 50
EP - 56
BT - Advances in Engineering Plasticity XII
PB - Trans Tech Publications Ltd
T2 - 12th Asia-Pacific Conference on Engineering Plasticity and Its Application, AEPA 2014
Y2 - 1 September 2014 through 5 September 2014
ER -