Mediation of high temperature radiation damage in bcc iron by Au or Cu precipitation
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 (TU Delft - RST/Fundamental Aspects of Materials and Energy)
S. van der Zwaag (TU Delft - Novel Aerospace Materials)
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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.