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

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Lee,  Dong-Hyun
Alloys for Additive Manufacturing, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Citation

Zhao, Y., Park, J.-M., Lee, D.-H., Song, E. J., Suh, J.-Y., Ramamurty, U., et al. (2019). Influences of hydrogen charging method on the hydrogen distribution and nanomechanical properties of face-centered cubic high-entropy alloy: A comparative study. Scripta Materialia, 168, 76-80. doi:10.1016/j.scriptamat.2019.04.025.


Cite as: https://hdl.handle.net/21.11116/0000-0009-7357-4
Abstract
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. © 2019 Acta Materialia Inc