高能氦离子辐照对CLAM钢微观结构和力学行为的影响  

Effect of high energy helium ion irradiation on microstructure and mechanical response of CLAM steel

作　　者：罗爱博 梁延祥 姚勇[1,2] 王罗斌 万强 LUO Aibo;LIANG Yanxiang;YAO Yong;WANG Luobin;WAN Qiang(College of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621010,Sichuan,China;Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province,Mianyang 621010,Sichuan,China;Institute of Systems Engineering,China Academy of Engineering Physics,Mianyang 621999,Sichuan,China)

机构地区：[1]西南科技大学土木工程与建筑学院,四川绵阳621010 [2]工程材料与结构冲击振动四川省重点实验室,四川绵阳621010 [3]中国工程物理研究院总体工程研究所,四川绵阳621999

出　　处：《材料工程》2024年第5期138-147,共10页Journal of Materials Engineering

基　　金：国家自然科学基金重点项目(11632001);四川省科技厅应用基础研究项目(2022NSFSC1916)。

摘　　要：聚变堆包层结构材料在服役期间会产生辐照损伤,CLAM钢作为热核聚变堆的首选结构材料,对其进行辐照行为研究十分有必要。采用高能氦离子对CLAM钢进行辐照实验,利用纳米压痕实验结合原子力显微镜(AFM)研究CLAM钢在辐照过程中的微观组织演化和力学性能的变化。结果表明:辐照后的CLAM钢中形成位错环和He泡,且随着辐照剂量的增加,位错环和He泡密度增加,尺寸增大。辐照后CLAM钢发生显著的辐照硬化效应,随着辐照剂量的增加,辐照硬化程度增加,但当辐照剂量增大到一定程度,辐照硬化效应减弱。利用DBH模型和FKH模型讨论辐照中微观结构的变化对辐照硬化效应的影响。随着辐照剂量的增加,压痕周围材料隆起堆积的范围减小,堆积高度增加,且高剂量辐照后压痕周围的堆积中出现了剪切带,表明CLAM钢辐照后脆性明显增加。The blanket structural material of fusion reactor will induce radiation damage during the period of service. As the preferred structural material of thermonuclear fusion reactor, it is necessary to study its radiation behaviour. High energy helium ions were used to conduct irradiation experiments on CLAM steel,and the microstructure evolution and mechanical properties of CLAM steel during irradiation were studied using nanoindentation experiments combined with atomic force microscopy(AFM). The results show that dislocation loops and He bubbles are induced in irradiated CLAM steel, and the density and size of dislocation loops and He bubbles increases with the increase of irradiation dose. The results of the indentation experiment indicate that CLAM steel has a significant irradiation hardening effect after irradiation. The degree of irradiation hardening increases with the increase of irradiation dose, but when the irradiation dose increases to some extent, the irradiation hardening effect weakens. The effect of microstructure evolution on irradiation hardening effect is also discussed by DBH model and FKH model.The results of indentation morphology analysis show that the range of material protrusions around the indentation decreases with the increase of irradiation dose, the stacking height increases, and shear bands appear in the stacking around the indentation after high dose irradiation, indicating a significant increase in brittleness of CLAM steel after irradiation.

关 键 词：CLAM钢 氦离子辐照 辐照硬化 纳米压痕 DBH模型 FKH模型 

分 类 号：TL341[核科学技术—核技术及应用]