Deformation behavior and microstructure evolution of an AM80 magnesium alloy at large strain rate range

GUO Pengcheng; LI Jian; CAO Shufen; XU Congchang; LIU Zhiwen; LI Luoxing

doi:10.11883/bzycj-2016-0266

Volume 38 Issue 3

Feb. 2018

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GUO Pengcheng, LI Jian, CAO Shufen, XU Congchang, LIU Zhiwen, LI Luoxing. Deformation behavior and microstructure evolution of an AM80 magnesium alloy at large strain rate range[J]. Explosion And Shock Waves, 2018, 38(3): 586-595. doi: 10.11883/bzycj-2016-0266

Citation:

GUO Pengcheng, LI Jian, CAO Shufen, XU Congchang, LIU Zhiwen, LI Luoxing. Deformation behavior and microstructure evolution of an AM80 magnesium alloy at large strain rate range[J]. Explosion And Shock Waves, 2018, 38(3): 586-595. doi: 10.11883/bzycj-2016-0266

Citation:

GUO Pengcheng, LI Jian, CAO Shufen, XU Congchang, LIU Zhiwen, LI Luoxing. Deformation behavior and microstructure evolution of an AM80 magnesium alloy at large strain rate range[J]. Explosion And Shock Waves, 2018, 38(3): 586-595. doi: 10.11883/bzycj-2016-0266

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Deformation behavior and microstructure evolution of an AM80 magnesium alloy at large strain rate range

doi: 10.11883/bzycj-2016-0266

GUO Pengcheng^{1, 2},
LI Jian^{1, 2},
CAO Shufen¹,
XU Congchang^{1, 2},
LIU Zhiwen^{1, 2},
LI Luoxing^{1, 2
,
,}

1.
State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, Hunan, China
2.
College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, Hunan, China

Received Date: 2016-08-30
Rev Recd Date: 2017-02-22
Publish Date: 2018-05-25

Abstract

Abstract

In order to understand the deformation behavior and microstructure evolution of a solution treated AM80 magnesium alloy under quasi-static and impact loadings, quasi-static and high-speed impact compression tests at room temperature were performed by an Instron universal compression machine and a slip Hopkinson pressure bar apparatus, respectively. Under quasi-static loadings, the flow stress of the AM80 magnesium alloy decreases gradually with the increase of the strain rate (3×10^-5 s^-1 ≤ $\dot \varepsilon $ ≤ 4×10^-1 s^-1), showing a negative strain rate sensitivity. While, it increases with the increase of the strain rate (7.00×10² s^-1 ≤ $\dot \varepsilon $ ≤ 5.20×10³ s^-1) under impact loadings, demonstrating a significant positive strain rate sensitivity. Basal slip, mechanical twining as well as proper non-basal slip are the deformation mechanisms for the AM80 magnesium alloy under impact loadings. A larger number of dense tiny mechanical twins under impact loadings are the fundamental reasons for the significantly higher flow stress as compared with that under the quasi-static loadings. In addition, the deformation uniformity of the AM80 magnesium alloy increases significantly as the strain rate increases. When the strain rate increases to 3.65×10³ s^-1, dynamic recovery is detected in the same grains at the location of c, because the softening caused by the adiabatic temperature rise due to localized deformation is greater than the sum of strain hardening and strain rate hardening, which leads to a significant reduction in the density of deformation twins. As a result, the deformation uniformity declines finally.
- AM80 magnesium,
- high-speed impact,
- strain rate sensitivity,
- Johnson-Cook constitutive equation,
- deformation twinning

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References(26)

References

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