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

Research output: Contribution to journalArticleScientificpeer-review


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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