Mediation of high temperature radiation damage in bcc iron by Au or Cu precipitation

Journal article (2020)

Authors

Shasha Zhang Nanjing University of Aeronautics and Astronautics
Zhengjun Yao Nanjing University of Aeronautics and Astronautics
Zhaokuan Zhang Nanjing University of Aeronautics and Astronautics
Moliar Oleksandr Nanjing University of Aeronautics and Astronautics
Feida Chen Nanjing University of Aeronautics and Astronautics
Xingzhong Cao Institute of High Energy Physics Chinese Academy of Science
Peng Zhang Institute of High Energy Physics Chinese Academy of Science
N.H. van Dijk RST/Fundamental Aspects of Materials and Energy - AS
S. van der Zwaag Novel Aerospace Materials - Aerospace Engineering
Research Group
RST/Fundamental Aspects of Materials and Energy (AS) (TU Delft)
Copyright: © 2020 Shasha Zhang, Zhengjun Yao, Zhaokuan Zhang, Moliar Oleksandr, Feida Chen, Xingzhong Cao, Peng Zhang, N.H. van Dijk, S. van der Zwaag
DOI
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https://doi.org/10.1016/j.nimb.2019.11.035
Nanoindentation Hardening Au/Cu precipitation Bcc Fe Positron annihilation spectroscopy Radiation damage
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Published Date

2020

Language

English

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Faculty

Applied Sciences

Department

RST/Radiation, Science and Technology

Research Group

RST/Fundamental Aspects of Materials and Energy

Abstract

High temperature radiation damage in binary bcc Fe alloys containing 1 atomic % Au or Cu due to Fe ion irradiation at 550 °C to a peak dose of 2.8 and 8.3 dpa is studied. The precipitation behavior of gold and copper and its correlation to the irradiation-induced defects is studied by transmission electron microscopy and variable energy positron annihilation spectroscopy (VEPAS). The increase of S parameters from VEPAS indicates the formation of open volume defects upon irradiation. Disc-shaped Au precipitates, grown from the irradiation induced dislocations, are observed in the Fe-Au alloy. In the Fe-Cu alloy, spherical Cu particles are formed but no direct connection between Cu precipitates and radiation damage is detected. For the Fe-Au alloy, the surface hardness dramatically increases for a dose of 2.8 dpa, with a slight decrease as the irradiation dose is enhanced to 8.3 dpa. In the Fe-Cu alloy, radiation hardening increases continuously.