Investigation of irradiation induced creep and growth by using stressed in-situ irradiation correlated to computer simulation

在核反应堆的真实的环境中，结构材料必须承受显著的应力水平。已经观察到，在辐照下可能发生塑性变形，导致尺寸变化和下垂。该项目旨在评估材料缺陷的产量和增长行为和机制下的弹性应力水平等于发现在核反应堆堆芯的真实的工作环境。全面的调查将提供更好的理解（1）辐射诱导蠕变，导致尺寸变化和下垂，和（2）微观层面的裂纹形成，导致材料的过早失效。本计画将结合联合收割机的透射电子显微镜（TEM）原位技术与分子动力学（MD）模拟，以建立核材料辐照诱发奈米缺陷与其诱发蠕变及尺寸成长之间的内在关系。研究结果将为寻找辐射损伤修复材料提供有益的基础，并将指导未来核材料的探索。此外，由于这个项目，我们将为新一代核工程师提供高水平的HQP培训。

In the real environment of nuclear reactors, structural materials have to withstand significant stress levels. It has been observed that under irradiation plastic deformation may occur, leading to dimensional change and sag. This project is aiming at evaluating material defect yields and growth behaviors and mechanisms under an elastic stress level equal to that found in real working environments of nuclear reactor cores. The comprehensive investigation will provide better understanding of (1) irradiation-induced creep, leading to dimensional changes and sag, and of (2) micro-level crack formation leading to premature failure of the materials. In this project we are going to combine transmission electron microscopy (TEM) in-situ techniques and molecular dynamic (MD) simulations, to establish the intrinsic relationship between irradiation induced nano defects and its induced creep and dimensional growth of nuclear materials. Results will provide useful ground to find materials remedy to radiation damage and will guide the exploration of future nuclear materials. In addition, thanks to this project, we will provide a high level of HQP training for the new generation of nuclear engineers.