Hydrogen embrittlement of an interstitial equimolar high-entropy alloy. (15th May 2018)

• Record Type: Journal Article
• Authors: Luo, Hong; Li, Zhiming; Lu, Wenjun; Ponge, Dirk; Raabe, Dierk
• Is Part Of: Corrosion science. Volume 136(2018)
• Page Start: 403
• Page End: 408
• Publication Date: 2018-05-15
• Subjects: A. Alloy -- B. Hydrogen permeation -- B. SEM -- C. Hydrogen embrittlement; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2018.03.040
• Languages: English
• ISSNs: 0010-938X

Abstract

Graphical abstract: Highlights: Hydrogen embrittlement mechanism in an interstitial high-entropy alloy is revealed. Hydrogen enhanced localized plasticity is critical to the embrittlement. Both intergranular and transgranular fracture under hydrogen are observed. Aggregated nano-carbides are potential sites for crack initiation under hydrogen. Abstract: We investigated the hydrogen embrittlement mechanism in an interstitially carbon alloyed equimolar CoCrFeMnNi high-entropy alloy (HEA) through low strain rate tensile testing under in-situ hydrogen charging. The tensile ductility was significantly reduced by hydrogen charging. The failure mode of the interstitial HEA in presence of hydrogen was a combination of intergranular and transgranular fracture as well as microvoid coalescence. Aggregated nano-carbides act as potential sites for crack initiation. These findings show that the carbon alloyed equimolar high-entropy alloy is susceptible to hydrogen embrittlement.