Influences of hydrogen charging method on the hydrogen distribution and nanomechanical properties of face-centered cubic high-entropy alloy : a comparative study

• Main Authors: Zhao, Yaki, Park, Jeong-Min, Lee, Dong-Hyun, Song, Eun Ju, Suh, Jin-Yoo, Ramamurty, Upadrasta, Jang, Jae-il
• Other Authors: School of Mechanical and Aerospace Engineering
• Format: Article
• Language: English
• Published: 2021
• Subjects: Engineering::Mechanical engineering; High-entropy Alloy; Hydrogen Charging Method
• Online Access: https://hdl.handle.net/10356/151738
• Institution: Nanyang Technological University

The influence of charging method on hydrogen (H)distribution and the resultant nanomechanical behavior of CoCrFeMnNi high-entropy alloy was examined and compared with another face-centered cubic structured alloy, an austenitic stainless steel. Through thermal desorption spectroscopy measurement and theoretical analysis, it was revealed that electrochemical (E-)charging induces steep gradient of H concentration near the surface while H was homogenously distributed after gaseous (G-)charging. Nanoindentation results show significant hardening in E-charged alloys while the hardness of G-charged alloys remains invariant. These differences were rationalized in terms of the nature of H distributions induced by different charging methods.