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Meeting 2025 TMS Annual Meeting & Exhibition
Symposium Materials for Sustainable Hydrogen Energy
Presentation Title Temperature dependence of hydrogen embrittlement mechanisms in a medium entropy alloy
Author(s) jingjing zhou
On-Site Speaker (Planned) jingjing zhou
Abstract Scope The application of liquid hydrogen energy in aerospace and deep-sea exploration imposes higher requirements for the reliability of components across a wide temperature range. Medium-entropy alloys (MEAs) are widely concerned because of their excellent mechanical properties. Here, we examined slow strain tensile tests on (VCoNi)96Al2Ti2 MEA and found that the alloy shows greater resistance to HE at 77K than at 298K. Micro-characterizations demonstrate that intergranular fracture dominates at 77K while the transgranular fracture dominates at 298K. Moreover, the transgranular cracks show three paths at both temperatures, which are along the representative {111} slip planes, along the {100} crystal plane and not along any crystal planes. The surprising finding was that the main path of crack growth changes from {111} to {100} with the temperature decrease from 298K to 87K. The difference in temperature dependence of H trapping, dislocation evolution and H-induced cracking was discussed based on the proposed HE mechanism.
Proceedings Inclusion? Planned:
Keywords High-Entropy Alloys,

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Computational Insights into Hydrogen Adsorption and Separation on Pd-Pt Alloy Membranes
Decomposition and Decelerated Grain Growth of the Nanostructured High Entropy Alloy TiVZrNbHf under Hydrogen
Density functional theory study on the influence of solute elements on the efficiency of Mg2Ni hydrogen storage alloys
Effect of MgH2 on High Entropy Alloys for Energy Application
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Effect on hydrogen trapping in laser welded advanced high strength steels
Environmental degradation of Ni-based superalloys in hydrogen-based combustion systems
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High Temperature Hydrogen Degradation of Structural Materials of Nuclear-Hydrogen Generating Systems
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Hydrogen Release Mechanism of MgH2 Doped with Fe-Rich Additives
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Investigation of Hydrogen Embrittlement Effect Using Ex-situ Impact and In-situ Slow Rate Charpy Tests on an X65 Steel and Weld
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Manipulating the Location of Hydride in α/β Titanium Alloy
Microscopic Characterization of Hydrogen Distribution and Hydrogen Embrittlement in Steels
Microstructure impacts on H uptake kinetics in polycrystalline microstructures for solid-state H storage materials
Modeling Hydrogen Influence on Ni201 Plastic Behavior and Calibration using Coupon-based and in-situ X-ray Diffraction Microscopy Experimental Data
New characterisation methods for high pressure hydrogen facing materials
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NUMERICAL MODELING OF CAVITY GROWTH RESULTING FROM RAPID GAS DECOMPRESSION :
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Size and Shape Dependence of Hydrogen-Induced Phase Transformation and Sorption Hysteresis in Palladium Nanoparticles
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The less known impact of high temperature (> 400 °C) hydrogen induced degradation of steels and Ni-based alloys
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