Localized Plasticity and Associated Cracking in Stable and Metastable High-Entropy Alloys Pre-Charged with Hydrogen
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Description
Published version
Size
1.1 MB
Format
Adobe PDF
Checksum (MD5)
00e77f2804e02e09d72ad711c78b8327
Author(s)
Ichii, Kenshiro
Koyama, Motomichi
Tasan, Cemal Cem
Tsuzaki, Kaneaki
Date Issued
2018
Journal
Procedia Structural Integrity
Publisher
Elsevier BV
Version
Final published version
Abstract
© 2018 The Authors. We investigated hydrogen embrittlement in Fe20Mn20Ni20Cr20Co and Fe30Mn10Cr10Co (at.%) alloys pre-charged with 100 MPa hydrogen gas by tensile testing at three initial strain rates of 10 -4 , 10 -3 , and 10 -2 s -1 at ambient temperature. The alloys are classified as stable and metastable austenite-based high-entropy alloys (HEAs), respectively. Both HEAs showed the characteristic hydrogen-induced degradation of tensile ductility. Electron backscatter diffraction analysis indicated that the reduction in ductility by hydrogen pre-charging was associated with localized plasticity-assisted intergranular crack initiation. It should be noted as an important finding that hydrogen-assisted cracking of the metastable HEA occurred not through a brittle mechanism but through localized plastic deformation in both the austenite and ϵ-martensite phases.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Terms of Use
Creative Commons Attribution-NonCommercial-NoDerivs License
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DOI of Published Version
https://doi.org/10.1016/J.PROSTR.2018.12.119
