High He-ion irradiation resistance of CrMnFeCoNi high-entropy alloy revealed by comparison study with Ni and 304SS

doi:10.1016/j.jmst.2018.09.050

Abstract

Abstract:

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?°C. Although the He bubbles have a similar size about 2?nm 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?°C, respectively. Moreover, the density of SFs/SFTs displays in an order of Ni < 304SS?

Key words: High entroy alloy (HEA), CrMnFeCoNi, He-ion, Irradiation, Hardening

Lixin Yang, Hualong Ge, Jian Zhang, Ting Xiong, Qianqian Jin, Yangtao Zhou, Xiaohong Shao, Bo Zhang, Zhengwang Zhu, Shijian Zheng, Xiuliang Ma. High He-ion irradiation resistance of CrMnFeCoNi high-entropy alloy revealed by comparison study with Ni and 304SS[J]. J. Mater. Sci. Technol., 2019, 35(3): 300-305.

Figures/Tables 4

Fig. 1. SRIM simulation of He-ion irradiation damage and He concentration via depth, indicating that the Ni, 304SS, and HEA show similar damage and concentration distribution.

Fig. 2. Cross-section TEM images of samples irradiated by He-ion at RT: (a) Ni, (b) 304SS, (c) HEA and enlarged TEM images corresponding to their He bubble concentrated regions labelled with I-III; (d, e) typical He bubbles and SFs/SFTs in HEA acquired from regions marked with “d” and “e” in image III. The Ni and 304SS also show the similar distribution of He bubbles and SFs/SFTs.

Fig. 3. Cross-section TEM images of samples irradiated by He-ion at 450?°C: (a) Ni; (b) 304SS; (c) HEA; (d, e) typical He bubbles and SFs/SFTs in t HEA acquired from regions marked with “d” and “e” in (c); (f) He bubble size distribution. The Ni and 304SS also show the similar distribution of He bubbles and SFs/SFTs with that in HEA, but exhibiting bigger size and lower density.

Fig. 4. Hardness evolution of three materials induced by He-ion irradiation at RT and 450?°C. Error bars indicate standard deviation of 20 measurements of each sample (The abbreviation Ori, RT, 450 indicates the sample states of original, irradiated at RT, irradiated at 450?°C, respectively).

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