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Meeting TMS Specialty Congress 2026
Symposium 4th World Congress on High Entropy Alloys (HEA 2026)
Presentation Title Revealing the Impact of the Chemical Short-Range Order on Hydrogen Embrittlement of the Equiatomic CoCrNi Medium-Entropy Alloy
Author(s) David D. S. Silva, Caio L. G. P. Martins, Vinícius Bacurau, Angelo Andreoli, Pedro Oliveira, Sara Marques, Dilson Santos, Giovani Ribamar, Norbert Schell, Xiao-Ye Zhou, Turab Lookman, Guilherme Koga, Eric Mazzer, Francisco Coury
On-Site Speaker (Planned) David D. S. Silva
Abstract Scope Hydrogen embrittlement limits the reliability of structural materials essential for a hydrogen-based energy infrastructure. The equiatomic CoCrNi medium-entropy alloy has recently emerged as a promising system due to its exceptional mechanical performance in extreme environments. To unravel the impact of chemical short-range order (CSRO) on hydrogen migration, we combine slow-strain-rate tests in previously hydrogen charged samples with several ex-situ analyses, including hydrogen gas permeation tests, thermal desorption spectroscopy (TDS), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), high-energy synchrotron X-ray diffraction (HE-SXRD), transmission electron microscopy (TEM), and atom probe tomography (APT). Moreover, to interpret our experimental results, we develop a deep-learning interatomic potential specifically tailored for CoCrNi-H systems. This enables large-scale molecular dynamics simulations that simultaneously resolve hydrogen mobility and CSRO at atomic resolutions. The role of CSRO in governing hydrogen diffusivity and hydrogen embrittlement resistance is critically examined.
Proceedings Inclusion? Undecided

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In-Situ Spatiotemporal Characteristics of Deformation: From Microstructurally Simple Metals to Complex Concentrated Alloys
Influence of Chemical Short-Range Order on Stacking Fault Energy and Deformation in a CoCrNi-based Alloy
Influence of Ti on the Mechanical Properties and Strengthening Mechanisms of In-Situ Alloyed CoCrNi Processed via Laser Powder Bed Fusion
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