Irradiation induced void spheroidization, shrinkage and migration in Cu at elevated temperatures: An in situ study
Irradiation induced void spheroidization, shrinkage and migration in Cu at elevated temperatures: An in situ study
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DOI：
10.1016/j.actamat.2020.10.008
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发表时间：
2020-12
期刊：
影响因子：
9.4
通讯作者：
C. Fan;R. G. S. Annadanam;Z. Shang;Jin Li;Meimei Li;Haiyan Wang;A. El-Azab;Xinghang Zhang
中科院分区：
文献类型：
--
作者：
C. Fan;R. G. S. Annadanam;Z. Shang;Jin Li;Meimei Li;Haiyan Wang;A. El-Azab;Xinghang Zhang
由于辐照诱导的空洞通常会导致明显的体积膨胀和力学性能的下降，因此了解辐照环境中空洞的演化具有重要的意义。在这项工作中，我们在透射电子显微镜中进行了系统的原位1 MeV Kr++辐照Cu与纳米空隙高达350 °C。原位研究揭示了有趣的空洞球化、收缩和迁移。此外，纳米孔洞的形貌演化和迁移表现出强烈的依赖于辐照温度和初始孔洞尺寸。辐照后的分析确定了堆垛层错四面体的形式的缺陷簇，和剩余的大面状纳米空隙。基于相场模型，讨论了辐照诱导空洞球化和收缩的机理。
Understanding the void evolution in irradiation environment is of great interest and significance, as irradiation-induced voids typically lead to pronounced volumetric swelling and degradation of mechanical properties.In situstudies on the irradiation response of nanovoids at elevated temperature remain limited. In this work, we performed systematicin situ1 MeV Kr++irradiations on Cu with nanovoids in a transmission electron microscope up to 350 °C. Thein situstudies revealed intriguing void spheroidization, shrinkage and migration. Furthermore, the morphology evolution and migration of nanovoids showed a strong dependence on irradiation temperature and initial void size. Post-irradiation analyses identified defect clusters in the form of stacking fault tetrahedrons, and the remaining large faceted nanovoids. The underlying mechanisms of irradiation-induced void spheroidization and shrinkage were discussed based on phase-field modeling.