Precipitation of supersaturated solute in H ion irradiated Fe-Au and Fe-Au-W alloys studied by positron annihilation spectroscopy
Z. Zhang (Nanjing University of Aeronautics and Astronautics, Chinese Academy of Sciences)
S. Zhang (Nanjing University of Aeronautics and Astronautics)
Z. Yao (Nanjing University of Aeronautics and Astronautics)
X. Tao (Nanjing Institute of Technology)
X. Cao (Chinese Academy of Sciences)
P. Zhang (Chinese Academy of Sciences)
P. Kuang (Chinese Academy of Sciences)
Y. Fu (TU Delft - Novel Aerospace Materials)
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
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.