Nuclear Techniques ›› 2018, Vol. 41 ›› Issue (2): 20501-020501.doi: 10.11889/j.0253-3219.2018.hjs.41.020501


Study of hydrogen induced defects in Fe-1.0%Cu alloy by positron annihilation spectroscopy

LUO Jianbing1,2, ZHANG Peng2, ZHU Te2, CAO Xingzhong2, ZHANG Huaiqiang1, JIN Shuoxue2, YU Runsheng2, WANG Baoyi2   

  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
  • Received:2017-10-18 Revised:2017-11-17 Online:2018-02-10 Published:2018-02-06
  • Supported by:
    Supported by National Natural Science Foundation of China (No.91026006, No.11675188, No.11665001), Beijing Natural Science Foundation of China (No.1164017)

Abstract: [Background] Hydrogen damage has always been an important research topic in ferrous alloys, and hydrogen induced defects are important factors leading to mechanical deterioration. [Purpose] This paper aims to study types of hydrogen induced defects in the hydrogen-charged Fe-1.0%Cu alloy. [Methods] Positron annihilation lifetime spectroscopy and coincidence Doppler broadening spectrum were used. [Results] Positron annihilation long lifetime (τ2) of hydrogen-charged specimen annealed at 1073 K for 2 h and 723 K after being cold-rolled was 127.5ps and 124.1 ps, while that quenched before and after being hydrogen-charged was 171.5 ps and 241 ps. And the parameter S increased slightly for hydrogen-charged specimen after being annealed, while that quenched evidently increase due to the presence of vacancy which might interact with hydrogen, leading to the formation of vacancy clusters. The coincidence Doppler broadening (CDB) results show that in the low-momentum region, the ratio curves of the samples after being hydrogen-charged was higher than that before. [Conclusion] The results suggest that the types of hydrogen induced defects are related to the state of the samples before being hydrogen-charged. And Cu precipitates have no direct effect on the formation of hydrogen induced defects.

Key words: Hydrogen induced defects, Positron annihilation spectroscopy, Vacancy clusters, Dislocations, Fe-1.0% Cu alloy

CLC Number: 

  • TG156.9