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

Shasha Zhang, Zhengjun Yao, Zhaokuan Zhang, Moliar Oleksandr, Feida Chen, Xingzhong Cao, Peng Zhang, Niels van Dijk, Sybrand van der Zwaag

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)
1 Downloads (Pure)

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.

Original languageEnglish
Pages (from-to)69-75
Number of pages7
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume463
DOIs
Publication statusPublished - 2020

Keywords

  • Au/Cu precipitation
  • bcc Fe
  • Hardening
  • Nanoindentation
  • Positron annihilation spectroscopy
  • Radiation damage

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