Mediation of high temperature radiation damage in bcc iron by Au or Cu precipitation

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

卷:463

Article

Zhang, Shasha^1,2  Yao, Zhengjun^1,2  Zhang, Zhaokuan¹  Oleksandr, Moliar^1,2  Chen, Feida¹  Cao, Xingzhong³  Zhang, Peng³  van Dijk, Niels⁴  van der Zwaag, Sybrand^5,6 

[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, Nanjing 211106, Peoples R China

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

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

[5] Delft Univ Technol, Fac Aerosp Engn, Novel Aerosp Mat Grp, Kluyverweg 1, NL-2629 HS Delft, Netherlands

[6] Tsinghua Univ, Sch Mat Sci & Engn, Beijing, Peoples R China

关键词: Au/Cu precipitation;    Radiation damage;    Hardening;    Positron annihilation spectroscopy;    Nanoindentation;    bcc Fe;   

DOI  :  10.1016/j.nimb.2019.11.035

来源: Elsevier

【 摘 要 】

High temperature radiation damage in binary bcc Fe alloys containing 1 atomic % Au or Cu due to Fe ion irradiation at 550 degrees C to a peak dose of 2.8 and 8.3 dpa is studied. The precipitation behavior of gold and copper and its correlation to the irradiation-induced defects is studied by transmission electron microscopy and variable energy positron annihilation spectroscopy (VEPAS). The increase of S parameters from VEPAS indicates the formation of open volume defects upon irradiation. Disc-shaped Au precipitates, grown from the irradiation induced dislocations, are observed in the Fe-Au alloy. In the Fe-Cu alloy, spherical Cu particles are formed but no direct connection between Cu precipitates and radiation damage is detected. For the Fe-Au alloy, the surface hardness dramatically increases for a dose of 2.8 dpa, with a slight decrease as the irradiation dose is enhanced to 8.3 dpa. In the Fe-Cu alloy, radiation hardening increases continuously.

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