Comparative study of hydrogen embrittlement in stable and metastable high-entropy alloys. (June 2018)

• Record Type: Journal Article
• Authors: Ichii, Kenshiro; Koyama, Motomichi; Tasan, Cemal Cem; Tsuzaki, Kaneaki
• Is Part Of: Scripta materialia. Number 150(2018)
• Page Start: 74
• Page End: 77
• Publication Date: 2018-06
• Subjects: High entropy alloy -- Hydrogen embrittlement -- Martensitic phase transformation -- Austenitic steels -- Hydrogen desorption; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.03.003
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: We investigated the effects of hydrogen on the mechanical response and embrittlement behavior of Fe20Mn20Ni20Cr20Co and Fe30Mn10Cr10Co (at.%) alloys precharged with 100 MPa hydrogen gas. These alloys can be classified as stable and metastable austenite-based high entropy alloys (HEAs), respectively. We carried out tensile tests at initial strain rates of 10 −4 and 10 −2 s −1 at ambient temperature. Both HEAs revealed hydrogen embrittlement associated with localized plasticity-assisted intergranular crack initiation. It is important to note that hydrogen-assisted cracking of the metastable HEA occurred via localized plasticity for both the austenite and ε-martensite phases – an unusual observation for the latter. Graphical abstract: Unlabelled Image