Resistance of CoCrFeMnNi high-entropy alloy to gaseous hydrogen embrittlement

The influence of hydrogen on the mechanical behavior of the CoCrFeMnNi high-entropy alloy (HEA) was examined through tensile and nanoindentation experiments on specimens hydrogenated via gaseous and electrochemical methods. Results show that the HEA's resistance to gaseous hydrogen embrittlemen...

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Bibliographic Details
Published inScripta materialia Vol. 135; pp. 54 - 58
Main Authors Zhao, Yakai, Lee, Dong-Hyun, Seok, Moo-Young, Lee, Jung-A, Phaniraj, M.P., Suh, Jin-Yoo, Ha, Heon-Young, Kim, Ju-Young, Ramamurty, Upadrasta, Jang, Jae-il
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.07.2017
Subjects
High-entropy alloy
Hydrogen embrittlement
Nanoindentation
Tensile test
Thermal desorption spectroscopy
Tensile test
Hydrogen embrittlement
High-entropy alloy
Nanoindentation
Thermal desorption spectroscopy
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Summary:The influence of hydrogen on the mechanical behavior of the CoCrFeMnNi high-entropy alloy (HEA) was examined through tensile and nanoindentation experiments on specimens hydrogenated via gaseous and electrochemical methods. Results show that the HEA's resistance to gaseous hydrogen embrittlement is better than that of two representative austenitic stainless steels, in spite of the fact that it absorbs a larger amount of hydrogen than the two steels. Reasons for this were discussed in terms of hydrogen-enhanced localized plasticity mechanism and the critical amount of hydrogen required for it. These were further substantiated by additional experiments on electrochemically charged specimens. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2017.03.029