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Gradient-structured high-entropy alloy with improved combination of strength and hydrogen embrittlement resistance

Abstract : High-strength materials usually exhibit poor hydrogen embrittlement resistance, and thus, there are demands for materials with high strength and good ductility under hydrogen. Here, gradient structures containing surface nanotwins are introduced in a CrMnFeCoNi high-entropy alloy by surface mechanical attrition treatment, and hydrogen embrittlement resistance is compared with coarse- and nano-structured alloys produced by high-temperature homogenization and high-pressure torsion, respectively. The coarse-grained alloy shows high ductility, but its yield stress is low. The nanostructured alloy shows ultrahigh yield stress, but with poor hydrogen embrittlement resistance. The gradient-structured alloys have both high yield stress (500–700 MPa) and good ductility (15–33%) under hydrogen.
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https://hal.univ-lorraine.fr/hal-03619213
Contributor : Thierry Grosdidier Connect in order to contact the contributor
Submitted on : Friday, March 25, 2022 - 1:45:07 AM
Last modification on : Friday, April 8, 2022 - 2:56:29 PM

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Abbas Mohammadi, Marc Novelli, Makoto Arita, Jae Wung Bae, Hyoung Seop Kim, et al.. Gradient-structured high-entropy alloy with improved combination of strength and hydrogen embrittlement resistance. Corrosion Science, Elsevier, 2022, 200, pp.110253. ⟨10.1016/j.corsci.2022.110253⟩. ⟨hal-03619213⟩

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