金属材料辐照缺陷演化的分子动力学研究进展

辐照条件下，高能粒子在金属材料内部引入稠密的辐照缺陷，导致材料力学性能严重退化，缩短材料服役寿命，是辐照材料研究的关键问题。辐照缺陷多处在纳米尺度，故分子动力学方法是模拟辐照缺陷的有力工具，近年来被广泛用于研究辐照缺陷演化。本文总结了金属材料中辐照缺陷演化的分子动力学研究进展，介绍了级联碰撞、点缺陷、空洞、氦泡、Frank位错环、层错四面体等辐照缺陷，及其与位错、晶界等微结构的相互作用。分子动力学方法揭示的机制与模型，深化了学界对辐照效应的认识，有助于提高辐照材料力学性能和设计耐辐照材料。

Progress in molecular dynamics simulations of irradiation-induced defects in metallic materials

Under irradiation, high-energy particles introduce dense defects inside metallic materials, leading to severe degradation of mechanical properties and reducing the service life of irradiated materials. Since irradiation-induced defects are mostly at the nanoscale, molecular dynamics method is a powerful tool for simulating the defects, and has been widely used in recent years to study the evolution of irradiation-induced defects. In this paper, we introduced the progress of molecular dynamics research on irradiation-induced defects in metallic materials, including collision cascade, point defects, voids, helium bubbles, Frank loops, stacking fault tetrahedrons, as well as their interactions with dislocations and grain boundaries. The mechanisms and models revealed by molecular dynamics method deepen the understanding of irradiation effects, and help to improve the mechanical properties of irradiated materials and design irradiation-resistant materials.