Effective Hydrogen Diffusion Coefficient and Microstructural Behaviors Measured by Electrochemical Hydrogen Permeation for CoCrFeMnNi High-Entropy Alloy

18 Pages Posted: 22 Nov 2019

See all articles by Junghoon Lee

Junghoon Lee

Pusan National University - Department of Materials Science and Engineering

Cheolho Park

Korea Atomic Energy Research Institute

Hanji Park

Pusan National University - Department of Materials Science and Engineering

Namhyun Kang

Pusan National University - Department of Materials Science and Engineering

Abstract

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

Suggested Citation

Lee, Junghoon and Park, Cheolho and Park, Hanji and Kang, Namhyun, Effective Hydrogen Diffusion Coefficient and Microstructural Behaviors Measured by Electrochemical Hydrogen Permeation for CoCrFeMnNi High-Entropy Alloy. Available at SSRN: https://ssrn.com/abstract=3490394 or http://dx.doi.org/10.2139/ssrn.3490394

Junghoon Lee (Contact Author)

Pusan National University - Department of Materials Science and Engineering

Korea, Republic of (South Korea)

Cheolho Park

Korea Atomic Energy Research Institute

Hanji Park

Pusan National University - Department of Materials Science and Engineering

Korea, Republic of (South Korea)

Namhyun Kang

Pusan National University - Department of Materials Science and Engineering ( email )

Korea, Republic of (South Korea)

Here is the Coronavirus
related research on SSRN

Paper statistics

Downloads
22
Abstract Views
122
PlumX Metrics