High entropy alloys（HEAs） have presented potential applications in nuclear power plants owing to their novel atomic structure based high irradiation resistance. However, understanding of He-ion irradiation of HEAs is still lacking. In this work, we reveal He-ion irradiation resistance of HEA CrMnFeCoNi by comparison study with a pure Ni and a 304 stainless steel（304SS）. It is found that the damage structure in the three materials can be characterized with He bubbles and stacking faults/stacking fault tetrahedrons(（SFs/SFTs）, which show a similar depth distribution after He-ion irradiation at both RT and 450℃.Although the He bubbles have a similar size about 2nm after irradiation at RT, the He bubble sizes of the HEA, 304SS, and Ni increase to 4.0±0.9,5.3±1.0 and 6.7 ±1.0 nm after irradiation at 450℃, respectively. Moreover, the density of SFs/SFTs displays in an order of Ni < 304 SS < HEA at both RT and 450℃.The He-ion irradiation at RT causes significant hardness enhancement for the three materials, however,compared to RT, after irradiation at 450℃, the Ni presents softening, while the 304SS, especially the HEA,shows further hardening. Thus, the HEA CrMnFeCoNi possesses the smallest He bubble size, the densest SFs/SFTs, and the highest hardening, indicating the best structural stability, as well as the best He-ion irradiation resistance, which can be attributed to its low mobility of He atoms and point defects.
类型: 期刊论文
作者: Lixin Yang,Hualong Ge,Jian Zhang,Ting Xiong,Qianqian Jin,Yangtao Zhou,Xiaohong Shao,Bo Zhang,Zhengwang Zhu,Shijian Zheng,Xiuliang Ma
来源: Journal of Materials Science & Technology 2019年03期
年度: 2019
分类: 工程科技Ⅰ辑
专业: 金属学及金属工艺
单位: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences,School of Material Science and Engineering, University of Science and Technology of China,School of Energy Research, Xiamen University,School of Material Science and Engineering, Lanzhou University of Technology
基金: supported financially by the “Hundred Talents Project” of Chinese Academy of Sciences,the “Thousand Youth Talents Plan” of China,the National Natural Science Foundation of China (Nos. 51401208 and 51771201),the Shenyang National Laboratory for Materials Science (No. 2017RP17)
分类号: TG139
页码: 300-305
总页数: 6
文件大小: 672K
下载量: 43
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