Self healing of radiation-induced damage in Fe–Au and Fe–Cu alloys: Combining positron annihilation spectroscopy with TEM and ab initio calculations

Shasha Zhang, Jakub Cizek, Zhengjun Yao, Moliar Oleksandr, Xiangshan Kong, Changsong Liu, Niels van Dijk, Sybrand van der Zwaag

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

Abstract

Self healing of early stage radiation damage by site selective solute segregation is a promising approach to extend the lifetime of nuclear reactor components. In the present study, the creation and autonomous healing of irradiation-induced damage is investigated in pure Fe and high purity Fe–Au and Fe–Cu model alloys. To create radiation damage samples are irradiated at 550 °C by 120 keV He+ ions with fluences of 5.0 × 1015, 1.0 × 1016 and 5.0 × 1016 ions/cm2. The observed increase in the S and W parameters determined in the variable energy positron annihilation spectroscopy measurements indicates the formation of vacancy-like defects, precipitates and vacancy-solute complexes. The presence of substitutionally dissolved Au is found to reduce the formation of radiation defects more efficiently than solute Cu. Site-specific Au precipitation at defect sites is indicated, which results in damage healing with a reduced swelling, whereas Cu precipitates and radiation damage only show weak interaction. Ab initio calculations show that the binding energies of Au solutes to vacancy clusters (Au-Vn) are significantly larger than those of Cu solutes (Cu-Vn) whereas the binding energies of helium filled vacancy clusters Au-HenVn and Cu-HenVn are comparable.

Original languageEnglish
Article number152765
JournalJournal of Alloys and Compounds
Volume817
DOIs
Publication statusPublished - 2020

Keywords

  • Ab initio calculations
  • Au/Cu precipitation
  • bcc Fe
  • Positron annihilation spectroscopy
  • Radiation-induced defects
  • Self-healing

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