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

Journal article (2021)

Authors

Zhizhou 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
Xiaoping 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 Novel Aerospace Materials - Aerospace Engineering
N.H. van Dijk RST/Fundamental Aspects of Materials and Energy - AS
S. van der Zwaag Novel Aerospace Materials - Aerospace Engineering
Research Group
Novel Aerospace Materials (Aerospace Engineering) (TU Delft)
Copyright: © 2021 Z. Zhang, S. Zhang, Z. Yao, X. Tao, X. Cao, P. Zhang, P. Kuang, Y. Fu, N.H. van Dijk, S. van der Zwaag
DOI
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https://doi.org/10.1016/j.nimb.2021.06.022
Precipitation Fe-based alloys Positron annihilation spectroscopy Hydrogen ion irradiation Thermal aging
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Published Date

2021

Language

English

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Faculty

Aerospace Engineering

Department

Aerospace Structures & Materials

Research Group

Novel Aerospace Materials

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.