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

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:505

Article

Zhang, Z.^1,2  Zhang, S.^1,2  Yao, Z.^1,2  Tao, X.³  Cao, X.⁴  Zhang, P.⁴  Kuang, P.⁴  Fu, Y.^5,6  van Dijk, N. H.⁵  van der Zwaag, S.⁶ 

[1] Nanjing Univ Aeronaut & Astronaut, Coll Mat & Technol, Nanjing 211106, Peoples R China

[2] Nanjing Univ Aeronaut & Astronaut, Minist Ind & Informat Technol, Key Lab Mat Preparat & Protect Harsh Environm Nan, Nanjing 211106, Peoples R China

[3] Nanjing Inst Technol, Sch Mat Sci & Engn, Nanjing 211167, Peoples R China

[4] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China

[5] Delft Univ Technol, Fac Sci Appl, Fundamental Aspects Mat & Energygrp, Mekelweg 15, NL-2629 JB Delft, Netherlands

[6] Delft Univ Technol, Novel Aerosp Mat Grp, Fac Aerosp Engn, Delft, Netherlands

关键词: Precipitation;    Hydrogen ion irradiation;    Thermal aging;    Positron annihilation spectroscopy;    Fe-based alloys;   

DOI  :  10.1016/j.nimb.2021.06.022

来源: Elsevier

【 摘 要 】

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 degrees 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.

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