Precipitation of supersaturated solute in H ion irradiated Fe-Au and Fe-Au-W alloys studied by positron annihilation spectroscopy

Z. Zhang, S. Zhang*, Z. Yao, X. Tao, X. Cao, P. Zhang, P. Kuang, Y. Fu, N. H. van Dijk, S. van der Zwaag

*Corresponding author for this work

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The effect of thermal aging of homogenized Fe-Au and Fe-Au-W alloys, irradiated at room temperature with hydrogen ions, was studied for an aging treatment at 300 °C for aging times up to 100 h. The aging behavior of the Fe-based alloys is compared to the results for pure Fe. The precipitation behavior of Au-rich and W-rich precipitates and its correlation to the H+ irradiation-induced defects is investigated by variable energy positron annihilation spectroscopy (VEPAS). The formation of open-volume defects after irradiation is monitored by an increase in the S parameter, while the recovery of the vacancy-like defects and the formation of precipitates are signalled by an increase in the W parameter. Au-rich precipitation continuously develops during long-term aging, as indicated by the increase in the W parameter. The change of the W parameter in the Fe-Au-W alloy is not only due to the effect of solute W on the Au precipitates, but also because of the interface of W-rich Laves phase with matrix.

Original languageEnglish
Pages (from-to)50-57
Number of pages8
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Publication statusPublished - 2021

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Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project
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  • Fe-based alloys
  • Hydrogen ion irradiation
  • Positron annihilation spectroscopy
  • Precipitation
  • Thermal aging


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