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

研究成果: Conference contribution

1 引文 斯高帕斯(Scopus)

摘要

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.

原文English
主出版物標題Advances in Engineering Plasticity XII
發行者Trans Tech Publications Ltd
頁面50-56
頁數7
ISBN(列印)9783038352266
DOIs
出版狀態Published - 2015
事件12th Asia-Pacific Conference on Engineering Plasticity and Its Application, AEPA 2014 - Kaohsiung, Taiwan
持續時間: 2014 9月 12014 9月 5

出版系列

名字Key Engineering Materials
626
ISSN(列印)1013-9826
ISSN(電子)1662-9795

Other

Other12th Asia-Pacific Conference on Engineering Plasticity and Its Application, AEPA 2014
國家/地區Taiwan
城市Kaohsiung
期間14-09-0114-09-05

All Science Journal Classification (ASJC) codes

  • 材料科學(全部)
  • 材料力學
  • 機械工業

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