Effective Hydrogen Diffusion Coefficient and Microstructural Behaviors Measured by Electrochemical Hydrogen Permeation for CoCrFeMnNi High-Entropy Alloy
18 Pages Posted: 22 Nov 2019
Herein, the first observation of the effective hydrogen diffusion coefficient of CoCrFeMnNi high-entropy alloy (HEA) was performed using electrochemical hydrogen permeation; further, it was compared with those of Fe-17Cr-10Ni and Fe-18Cr-8Ni stainless steels (SS). HEA and Fe-17Cr-10Ni SS showed similar effective hydrogen diffusion coefficient of 1.75×10-11m2/s and 1.91×10-11 m2/s, respectively. Fe-18Cr-8Ni SS showed the smallest that of 0.58×10-11 m2/s in the study. Hydrogen diffusion through the grain boundary was dominant in face-centered cubic metals. Hydrogen permeation resulted in no change in the microstructure of HEA and Fe-17Cr-10Ni SS; however, it caused a martensitic transformation in Fe-18Cr-8Ni SS.
Keywords: high entropy alloy, austenitic steel, hydrogen diffusion, martensitic phase transformation, electrochemical permeation
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