The origin of discontinuous yielding in Mg alloys under slip-dominated condition studied by in-situ synchrotron diffraction and elastic-viscoplastic self-consistent modeling
The origin of discontinuous yielding in Mg alloys under slip-dominated condition studied by in-situ synchrotron diffraction and elastic-viscoplastic self-consistent modeling
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原位同步加速器衍射和弹粘塑性自洽模型研究滑移主导条件下镁合金不连续屈服的根源
DOI：
10.1016/j.msea.2019.03.073
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发表时间：
2019-04
期刊：
影响因子：
6.4
通讯作者：
Zheng M Y
中科院分区：
文献类型：
--
作者：
Chi Y Q;Zhou X H;Xu C;Sun D;Qiao X G;Brokmeier H G;Zheng M Y
挤压态的Mg-7Gd-2Y-1Zn-0.6Zr(wt.%)合金在挤压方向的单向拉伸下出现不连续屈服，峰时效处理消除了这一现象。通过原位同步辐射衍射和弹粘塑性自洽(EVPSC)模拟，研究了挤压态和峰时效合金的变形机制。原位同步辐射衍射结果表明，基面位错从溶质气氛中的解钉导致了基面滑移有利的晶粒的应力松弛。EVPSC模拟结果表明，挤压态合金的不连续屈服与基面位错和溶质气氛之间的相互作用有关。经过峰时效处理后，由于大量溶质原子的消耗，基位错与溶质气氛之间的相互作用减弱。从而消除了峰值时效合金的不连续屈服现象。
A discontinuous yielding was observed in the as-extruded Mg-7Gd-2Y-1Zn-0.6Zr (wt. %) alloy under uniaxial tension along the extrusion direction, which was eliminated by the peak-aging treatment. The deformation mechanisms of the as-extruded and peak-aged alloys were studied by in-situ synchrotron diffraction measurement and elastic-viscoplastic self-consistent (EVPSC) modeling. The in-situ synchrotron diffraction results suggest that the unpinning of basal dislocations from solute atmospheres causes the stress relaxation in the basal slip favored grains. The EVPSC modeling results indicate that the discontinuous yielding in the as-extruded alloy is associated with the interaction between basal dislocations and solute atmospheres. After peak-aging treatment, the interaction between basal dislocations and solute atmospheres is weakened due to the consumption of a number of solute atoms. Consequently, the discontinuous yielding is eliminated in the peak-aged alloy.
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DOI：
10.1007/978-1-4684-1860-6
发表时间：
1970-10
期刊：
--
影响因子：
--
作者：
E. O. Hall
通讯作者：
E. O. Hall
影响因子：
6
作者：
Jing Zhang;X. Y. Zhang;Wei-Gang Li;F. Pan;Zhengxiao Guo
通讯作者：
Jing Zhang;X. Y. Zhang;Wei-Gang Li;F. Pan;Zhengxiao Guo
DOI：
10.1016/j.msea.2012.02.030
发表时间：
2012-05-01
影响因子：
6.4
作者：
Ma, Lan;Mishra, Raja K.;Ding, Wenjiang
通讯作者：
Ding, Wenjiang
影响因子：
6
作者：
Homma, T.;Kunito, N.;Kamado, S.
通讯作者：
Kamado, S.
影响因子：
9.4
作者：
Stanford, Nicole;Atwell, Dale;Barnett, Matthew R.
通讯作者：
Barnett, Matthew R.