Strain Softening and Hardening Behavior in AZ61 Magnesium Alloy
Author(s): Haitao ZHOU, Liufa LIU, Qudong WANG, Da LU, Xiaoqin ZENG, Wenjiang DING
Pages: 691-693
Year: 2004 Issue: 6
Journal: JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Keyword: AZ61 Mg alloy; Recrystallization; Strain hardening and softening;
Abstract: The deformation behavior of AZ61 Mg alloy during hot deformation has been investigated in wide temperature and strain rate range by a Gleeble simulator. Specimens are deformed in compression in the temperature range of 523～673 K and at strain rates of 0.001～1 s-1. It is found that the flow curves exhibit a peak and then decrease towards steady-state of classical DRX, which decrease with rising temperature and decreasing strain rate. The deformation behavior of the specimens can be attributed to the occurrence of strain hardening and softening. As stress decreases, the strain hardening rate declines at a fast rate when temperature rises or strain rate decreases. The shapes of θ-σ curves indicate some important features such as subgrain formation, the critical stress, the peak stress and steady stress. The onset of DRX can be determined by the point of inflection on θ-σ or Inθ-σ curves.
Pages: 691-693
Year: 2004 Issue: 6
Journal: JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Keyword: AZ61 Mg alloy; Recrystallization; Strain hardening and softening;
Abstract: The deformation behavior of AZ61 Mg alloy during hot deformation has been investigated in wide temperature and strain rate range by a Gleeble simulator. Specimens are deformed in compression in the temperature range of 523～673 K and at strain rates of 0.001～1 s-1. It is found that the flow curves exhibit a peak and then decrease towards steady-state of classical DRX, which decrease with rising temperature and decreasing strain rate. The deformation behavior of the specimens can be attributed to the occurrence of strain hardening and softening. As stress decreases, the strain hardening rate declines at a fast rate when temperature rises or strain rate decreases. The shapes of θ-σ curves indicate some important features such as subgrain formation, the critical stress, the peak stress and steady stress. The onset of DRX can be determined by the point of inflection on θ-σ or Inθ-σ curves.
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