Hydrogen embrittlement of additively manufactured AlCoCrFeNi2.1 eutectic high-entropy alloy. (February 2022)

• Record Type: Journal Article
• Authors: Wan, Di; Guan, Shuai; Wang, Dong; Lu, Xu; Ma, Jun
• Is Part Of: Corrosion science. Volume 195(2022)
• Publication Date: 2022-02
• Subjects: High-entropy alloy (HEA) -- Tensile test -- Hydrogen embrittlement -- Additive manufacturing -- Electron backscattered diffraction (EBSD) -- Electron channeling contrast imaging (ECCI); Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2021.110007
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: AlCoCrFeNi2.1 eutectic high-entropy alloy (HEA) was fabricated in as-cast and additively manufactured (AM) states. The hydrogen embrittlement susceptibility of both materials was investigated through in-situ uniaxial tensile test. Combining several advanced high-resolution scanning electron microscopy (SEM)-based techniques, the deformation and hydrogen embrittlement behavior have been intensively discussed. Interfacial cracking along both phase boundaries and grain boundaries are found to be responsible for the hydrogen-assisted fracture of this material. The cracking susceptibility has a dependence on the manufactured phase morphology. The orientation relationship between the phases and the misorientation between grains also have a significant impact on the hydrogen-induced cracks. Graphical Abstract: ga1 Highlights: Eutectic HEA AlCoCrFeNi2.1 is fabricated by casting and additive manufacturing (AM). AM specimen has higher H content than as-cast one after same cathodic charging. Surface cracks are induced by H upon loading. Angle between phase boundary and load axis influences interfacial crack possibility. High-angle grain boundaries embrittle more than low-angle and phase boundaries.