Resistance of CoCrFeMnNi high-entropy alloy to gaseous hydrogen embrittlement

Zhao, Yakai; Lee, Dong-Hyun; Seok, Moo-Young; Lee, Junga; Phaniraj, M. P.; Suh, Jin-Yoo; Ha, Heung Yong; Kim, Ju‐Young; Ramamurty, Upadrasta; Jang, Jae-il

doi:10.1016/j.scriptamat.2017.03.029

Cited by 203 publications

(44 citation statements)

References 41 publications

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“…For instance, hydrogen enhanced localized plasticity 16 can occur in materials that are prone to planar slip, such as the here studied CoCrFeMnNi HEA 29 . This unfavorable mechanism was also observed in a gaseous hydrogen charged CoCrFeMnNi HEA 35 . Thus, a competition may exist between the beneficial nanotwining on the one hand and the unfavorable hydrogen embrittlement mechanisms on the other hand during deformation of the hydrogen charged HEA samples.…”

Section: Resultssupporting

confidence: 58%

“…Recent work by Zhao et al . 35 showed that a gaseous hydrogen charged equiatomic HEA with a hydrogen concentration of ~76.5 wt.ppm exhibitts a slight decrease in elongation, although it showed resistance to gaseous hydrogen embrittlement that is superior to that of 304 and 316 L austenitic stainless steels. This observation further indicates that hydrogen induced enhancement of strength and ductility are strongly dependent on the hydrogen concentration in the material.…”

Section: Resultsmentioning

confidence: 99%

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Hydrogen enhances strength and ductility of an equiatomic high-entropy alloy

Luo

Raabe

2017

Sci Rep

160

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Metals are key materials for modern manufacturing and infrastructures as well as transpot and energy solutions owing to their strength and formability. These properties can severely deteriorate when they contain hydrogen, leading to unpredictable failure, an effect called hydrogen embrittlement. Here we report that hydrogen in an equiatomic CoCrFeMnNi high-entropy alloy (HEA) leads not to catastrophic weakening, but instead increases both, its strength and ductility. While HEAs originally aimed at entropy-driven phase stabilization, hydrogen blending acts opposite as it reduces phase stability. This effect, quantified by the alloy’s stacking fault energy, enables nanotwinning which increases the material’s work-hardening. These results turn a bane into a boon: hydrogen does not generally act as a harmful impurity, but can be utilized for tuning beneficial hardening mechanisms. This opens new pathways for the design of strong, ductile, and hydrogen tolerant materials.

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Section: Resultssupporting

confidence: 58%

Section: Resultsmentioning

confidence: 99%

Hydrogen enhances strength and ductility of an equiatomic high-entropy alloy

Luo

Raabe

2017

Sci Rep

160

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“…Another use of hydrogen atoms within metal lattices is for use as an indicator to present the difference of structure between HEAs and traditional alloys [112]. The presence of hydrogen in metallic systems also has an effect on mechanical properties, which is another important research direction to be conducted in the field of HEAs [114,115].…”

Section: Hydrogen Storagementioning

confidence: 99%

Nanostructured high-entropy materials

2020

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“…Specifically, only ;5% reduction in the tensile ductility is noted relative to the uncharged counterpart. 69 However, the intergranular fracture appears at the edges when the hydrogen concentration is high. Even so, a ductile mode of microvoid coalescence is still observed in the inner regions where the hydrogen concentration is low.…”

Section: Quasi-static Uniaxial Tensile Loadingmentioning

confidence: 99%