辐照硬化位错动力学模拟的研究进展

Progress of Dislocation Dynamics Simulation on Irradiation Hardening

辐照硬化是金属材料的辐照效应之一,开展辐照硬化机理研究有助于设计可靠的反应堆结构材料。辐照产生的缺陷会对位错运动造成阻碍,被认为是辐照硬化的主要原因。近年来快速发展的位错动力学模拟方法为材料的微观组织变化和宏观力学性能之间建立起了桥梁,被广泛用于辐照硬化机理研究。对于一些辐照缺陷如位错环和层错四面体,位错动力学软件已能模拟它们对位错网络演化以及宏观力学响应的影响,使辐照硬化的定量预测成为可能。本文从位错动力学模型、不同类型辐照缺陷硬化效应的位错动力学模拟以及辐照硬化理论模型发展三个方面,综述了辐照硬化位错动力学模拟的研究进展,并展望该研究领域的主要科学问题。

Irradiation hardening is one of the most common effects in irradiated metallic material.Investigations on irradiation hardening mechanisms are of great significance to design reliable structural materials for nuclear reactors.Irradiation induced defects act as obstacles to dislocation motion which is believed as the main reason for irradiation hardening.In recent years,the rapid development of dislocation dynamics simulation method built a bridge connecting the microstructure and the macroscopic mechanical properties and widely applied to investigate the mechanisms of irradiation hardening.For some irradiation defects such as dislocation loop and stacking fault tetrahedron,dislocation dynamics simulation is capable of capturing their influences on the evolution of dislocation network and the macroscopic mechanical response,making it possible for quantitative prediction of the irradiation hardening.In this paper,the progress of dislocation dynamics simulation on irradiation hardening was reviewed from three aspects:The basic dislocation dynamics model,the recent dislocation dynamics simulations on typical irradiation defects induced hardening and the development of the theoretical models of irradiation hardening.Some scientific problems for future research were also presented.