Effect of directional grain structure and strain rate on impact properties and dislocation substructure of 6061-T6 aluminum alloy

Woei Shyan Lee, Mao Hung Liu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish
Title of host publicationAdvances in Engineering Plasticity XII
PublisherTrans Tech Publications Ltd
Pages50-56
Number of pages7
ISBN (Print)9783038352266
DOIs
Publication statusPublished - 2015
Event12th Asia-Pacific Conference on Engineering Plasticity and Its Application, AEPA 2014 - Kaohsiung, Taiwan
Duration: 2014 Sep 12014 Sep 5

Publication series

NameKey Engineering Materials
Volume626
ISSN (Print)1013-9826
ISSN (Electronic)1662-9795

Other

Other12th Asia-Pacific Conference on Engineering Plasticity and Its Application, AEPA 2014
CountryTaiwan
CityKaohsiung
Period14-09-0114-09-05

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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