Nuclear Techniques ›› 2019, Vol. 42 ›› Issue (7): 0-070201-7.doi: 10.11889/j.0253-3219.2019.hjs.42.070201


Study of H+ irradiation induced vacancy-type defects in RAFM steel by slow positron beams

Zihan ZHANG1,2,Ligang SONG2,Shuoxue JIN2,Xingzhong CAO2(),Jianrong SUN3,Zhiyuan HONG4,Xiaoyan LI1(),Jinyu LI3,Qingzhi YAN4,Baoyi WANG2   

  1. 1. School of Nuclear Science and Engineering, East China University of Technology, Nanchang 330013, China
    2. Multi-discipline Research Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
    3. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
    4. University of Science and Technology Beijing, Beijing 100083, China
  • Received:2019-01-04 Revised:2019-05-20 Online:2019-07-10 Published:2019-07-16
  • Contact: Xingzhong CAO,Xiaoyan LI;
  • About author:ZHANG Zihan, female, born in 1994, graduated from University of South China in 2016, master student, focusing on irradiation study of fusion reactor structural materials
  • Supported by:
    Supported by National Natural Science Foundation of China(No.U1732265, No.11775235, No.11775236, No.11475193)

Abstract: Background

RAFM steel is a good candidate structural material and is widely accepted today as a fusion reactor core material.


This study aims to investigate the radiation damage mechanism of reduced activation ferritic/martensitic (RAFM) steel, the vacancy-type defects and their effects on the material structure of RAFM steel irradiated by H+ were probed by slow positron beam.


The experimental sample was RAFM steel based on Fe-9wt.% Cr. H+ ion beam energy was 100 keV whilst the dose was set to be 1×1015 cm-2, 1×1016 cm-2, 1×1017 cm-2, respectively, for irradiation experiments.


The results of slow positron beam Doppler broadening measurement were available. The S parameter increased with the increase of dose, and the W parameter shows the opposite trend. The main irradiation area of the material was 142~348 nm, there were a large number of defects in this range, the irradiation mainly produced vacancy-type defects, most of which were hydrogen-vacancy complex defects. The concentration of irradiation defects increased with the H+ doses.


The size of the vacancy-type defect changes with the dose increase. When the irradiation dose reaches 1017 cm-2, the slope of the S-W curve changed, so the type of irradiation defects varies significantly, and the defects of larger size were occurred.

Key words: RAFM steel, H+ irradiation, Slow positron beam, Vacancy-type defects

CLC Number: 

  • TL341