为研究辐照条件下空洞的演化,分别在200,350和550℃对低活化铁素体/马氏体钢(RAFM)进行He离子辐照.实验结果显示,辐照损伤沿深度呈钟型分布,空洞的尺寸和密度均与空位产生率正相关.随着辐照温度升高,空洞的尺寸增大,密度降低,高温下可以观察到空洞在晶界的聚集和无空洞区(VDZs),在550℃可以观察到方形空洞.使用相场模型模拟空洞的演化机制,模拟结果显示,辐照条件下空洞演化可以分为孕育、形核和生长3个阶段,空洞界面能的各项异性是空洞形状的可能原因.“,”Helium ion irradiation at 200,350 and 550 ℃ was performed on a reduced activation ferritic/martensitic (RAFM) steel to investigate the evolution of voids during irradiation.Experimental results show that radiation damage has a bell-shape distribution along the depth.Both void size and density increase as vacancy production rate increases.When irradiation temperature rises,void size increases and void density decreases.Faceted voids are observed at 550 ℃.Void aggregation at grain boundaries (GBs) and void denuded zones (VDZs) are observed at high temperatures.A phase field model was employed to investigate the void evolution mechanism.The simulation results show that the void shape may be attributed to anisotropic void interface energy.During irradiation,as time goes on,void evolution can be divided into three stages: incubation stage,nucleation stage and growth stage.