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

Journal article (2016)

Authors

L Chen University of Tokyo, Tsinghua University
Z. C. Li Tsinghua University
H. Schut RST/Neutron and Positron Methods in Materials - AS
N. Sekimura University of Tokyo
Research Group
RST/Neutron and Positron Methods in Materials (AS) (TU Delft)
Copyright: © 2016 L. Chen, Z. C. Li, H. Schut, N. Sekimura
DOI: https://doi.org/10.1088/1742-6596/674/1/012012
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Published Date

26-01-2016

Language

English

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Faculty

Applied Sciences

Department

RST/Radiation, Science and Technology

Research Group

RST/Neutron and Positron Methods in Materials

Abstract

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 (290 oC). 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.

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