Stress Sensitivity Origin of Extended Defects Production Under Coupled Irradiation and Mechanical Loading
Stress Sensitivity Origin of Extended Defects Production Under Coupled Irradiation and Mechanical Loading
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DOI：
10.1016/j.actamat.2023.118758
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发表时间：
2023-02
期刊：
影响因子：
9.4
通讯作者：
Miaoying He;Yang Yang-Yang;Fei Gao;Yue Fan
中科院分区：
文献类型：
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作者：
Miaoying He;Yang Yang-Yang;Fei Gao;Yue Fan
在辐照和应力的并发驱动力下研究了扩展的和机械上高度严重的缺陷的产生。通过使用双温度模型来解释级联期间电子子系统和原子子系统之间的实际能量交换，并通过控制主应力空间中的机械载荷来消除对特定坐标系的依赖，我们为各种类型的辐照位错构建了应力敏感图。人们发现弗兰克环由体积应变决定，而肖克利偏环则对体积守恒剪切载荷敏感。通过跟踪耦合辐照和外部载荷期间的微观结构演变，并通过仔细检查中心碰撞区域附近局部冯米塞斯应力的时空变化，阐明了导致这些不同响应/敏感性的潜在机制。还讨论了这些发现对于控制微观结构缺陷和材料性能的新策略的影响。
The production of extended and mechanically highly consequential defects are investigated under concurrent driving forces of irradiation and stress. By using two-temperature model to account for realistic exchange of energy between the electronic subsystem and the atomic subsystem during cascades, and by controlling mechanical loading in the principal stress space to remove the dependance on a specific coordinate system, we build stress sensitivity maps for various types of irradiated dislocations. Frank loops are discovered to be dictated by volumetric strains, while Shockley partials are sensitive to volume-conserving shear loads. By tracking the microstructural evolutions during coupled irradiation and external loading, and by scrutinizing the temporal-spatial variation of local von Mises stresses near the center-collision region, the underlying mechanisms responsible for those different responses/sensitivities are elucidated. The implications of these findings in regard to a new strategy to control microstructural defects and materials performance are also discussed.