Nuclear Techniques ›› 2020, Vol. 43 ›› Issue (5): 50606-050606.doi: 10.11889/j.0253-3219.2020.hjs.43.050606

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles    

Effects of solid solution elements on microstructures and radiation resistance of binary nickel based alloys

Mingpeng CAO1,2,Chonglong FU1,2,Jianqing CAO1,Qi DENG1,2,Qiantao LEI1,Long YAN1()   

  1. 1.Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
    2.University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2019-12-23 Revised:2020-03-11 Online:2020-05-15 Published:2020-05-07
  • Contact: Long YAN E-mail:yanlong@sinap.ac.cn
  • About author:CAO Mingpeng, male, born in 1994, graduated from The Engineering & Technical College of Chengdu University of Technology in 2017, master student, focusing on irradiation effect on nickel base alloy
  • Supported by:
    National Natural Science Foundation of China(11675246)

Abstract: Background

In recent years, nickel based alloys have been used as candidate structural materials for the advanced fission reactor. Radiation effects on nickel based alloys have been widely studied whilst little attention has been paid to the effects of solid solution elements on irradiation of nickel based alloys.

Purpose

This study aims to understand the effects of Mo and Cr on the radiation resistance of binary nickel-based alloys.

Methods

First of all, Ni, Ni-Cr and Ni-Mo alloy samples were irradiated by 2 MeV Ne ions at room temperature. The irradiation fluxes were set 1.6×1015 ions·cm-2, 3.2×1015 ions·cm-2 and 9.6×1015 ions·cm-2, respectively. Then the grazing incidence X-ray diffraction (GIXRD) was employed to investigate the microstructure changes of the samples, and the nano-indentation technique was used to measure the hardness of irradiated samples.

Results

GIXRD results show that the crystal lattices of Ni, Ni-Cr and Ni-Mo alloys have no obvious distortion, and no precipitated phase is formed. Nano indentation results show that ion irradiation causes hardening of Ni, Ni-Cr and Ni-Mo alloys. When the irradiation damage reaches 0.5~3.0 dpa (displacement per atom), the hardening of Ni-Cr and Ni-Mo alloys approaches saturation while the hardening of Ni is unsaturated. Finally, the mechanism of irradiation hardening was analyzed by using Orowan model and Makin-Minter equation.

Conclusions

The radiation resistance of Ni-Mo alloy is better than that of Ni-Cr alloy. Ni has the tendency of continuous hardening with the increase of radiation.

Key words: Binary nickel based alloys, Ion irradiation, Makin-Minter equation