Positron annihilation study of Fe-ion irradiated reactor pressure vessel model alloys

The International Workshop on Positron Studies of Defects 2014

Chen, L.^1,4 ; Li, Z.C.^2 ; Schut, H.^3 ; Sekimura, N.^4

State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing

100084, China^1

Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing

100084, China^2

Department of Radiation Science and Technology, Delft University of Technology, Mekelweg 15, JB Delft

2629, Netherlands^3

Department of Nuclear Engineering and Management, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo

113-8656, Japan^4

关键词: Additional annealing;    Chemical complexity;    High temperature irradiation;    Positron annihilation doppler broadening spectroscopy;    Power plant operations;    Reactor Pressure Vessel;    Reactor pressure vessel steels;    Vacancy-type defects;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/674/1/012012/pdf
DOI  :  10.1088/1742-6596/674/1/012012

来源: IOP

【 摘 要 】

The degradation of reactor pressure vessel steels under irradiation, which results from the hardening and embrittlement caused by a high number density of nanometer scale damage, is of increasingly crucial concern for safe nuclear power plant operation and possible reactor lifetime prolongation. In this paper, the radiation damage in model alloys with increasing chemical complexity (Fe, Fe-Cu, Fe-Cu-Si, Fe-Cu-Ni and Fe-Cu-Ni-Mn) has been studied by Positron Annihilation Doppler Broadening spectroscopy after 1.5 MeV Fe-ion implantation at room temperature or high temperature (290oC). It is found that the room temperature irradiation generally leads to the formation of vacancy-type defects in the Fe matrix. The high temperature irradiation exhibits an additional annealing effect for the radiation damage. Besides the Cu-rich clusters observed by the positron probe, the results show formation of vacancy-Mn complexes for implantation at low temperatures.