首页|Degradation of tensile mechanical properties of two AlxCoCrFeNi (x=0.3 and 0.4) high-entropy alloys exposed to liquid lead-bismuth eutectic at 350 and 500°C
Degradation of tensile mechanical properties of two AlxCoCrFeNi (x=0.3 and 0.4) high-entropy alloys exposed to liquid lead-bismuth eutectic at 350 and 500°C
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NSTL
Elsevier
Tensile mechanical properties of two AlxCoCrFeNi (x = 0.3 and 0.4) high-entropy alloys (HEAs) have been tested in liquid lead-bismuth eutectic (LBE) at 350 and 500 °C. The results show that LBE has a mild effect on the mechanical properties of Al0.3CoCrFeNi HEA which is a pure FCC structure, but some traces of liquid metal embrittlement (LME), such as cleavage, are detected at 350 °C and a tendency of intergranular (IG) cracking at 500 °C is also discovered. The mechanical properties of Al0.4CoCrFeNi HEA are strongly temperature-dependent. At 350 °C, the degradation effect of LBE is weak, while after the testing temperature increases to 500 °C, the mechanical properties are severely deteriorated even without the help of LBE. The mechanism responsible for this severe degradation phenomenon can be attributed to a network of thin (Ni, Al)-rich precipitates existing at the grain boundaries of the Al0.4CoCrFeNi HEA. As temperature increases, the precipitate/matrix interphase boundaries (IBs) become weak and can be perfectly wetted by LBE, leading to prevalent IG cracking facets on the fracture surface.
DissolutionHigh entropy alloysIntergranular crackingLiquid metal embrittlementWetting
Gong X.、Chen H.、Zhu W.、Pang B.、Yin Y.、Zhang F.、Ma H.
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Advanced Nuclear Energy Research Team Department of Nuclear Science and Technology College of Physics and Optoelectronic Engineering Shenzhen University
China General Nuclear Power Corporation (CGN) China Nuclear Power Technology Research Institute Co. Ltd.
NSTL
Elsevier
