What is it about?
A critical aspect of high entropy alloys (HEAs), particularly for applications in hydrogen-rich environments, is their resistance to hydrogen embrittlement (HE). HE is a phenomenon where hydrogen atoms diffuse into the metal, causing it to become brittle and fracture under stress. This is a major concern for structural materials used in industries such as energy, transportation, and aerospace.
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Why is it important?
The hydrogen-induced cracking behavior and mechanism of an L12-strengthened Ni50Cr20Co15Al10V5 high entropy alloy was evaluated using the tensile test after hydrogen charging. The microstructures and hydrogen-induced cracks were characterized by electron backscatter diffraction and electron channeling contrast imaging methods.
Perspectives
After deformation, the local strain was concentrated in the precipitate-matrix interfaces. The precipitate-matrix boundary and the interior of precipitates were prone to hydrogen embrittlement, where hydrogen-induced cracks tended to propagate, attributing to the hydrogen-enhanced decohesion mechanism.
Professor Milos B. Djukic
University of Belgrade, Faculty of Mechanical Engineering
Read the Original
This page is a summary of: Hydrogen-induced crack behavior of a precipitation-strengthened Ni50Cr20Co15Al10V5 high entropy alloy, Corrosion Science, December 2024, Elsevier,
DOI: 10.1016/j.corsci.2024.112562.
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