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Meeting 2026 TMS Annual Meeting & Exhibition
Symposium Advances in Multi-Principal Element Alloys V: Mechanical Behavior
Presentation Title Hydrogen-Enhanced Localized Plasticity in Nanoparticle-Reinforced CoCrFeNi Medium-Entropy Alloys
Author(s) Vivek Devulapalli, Manoj Prabhakar, Piotr Sokolinski, Fiona Schulz, Eric Jaegle, Xavier Maeder, Jazmin Duarte, Gerhard Dehm
On-Site Speaker (Planned) Vivek Devulapalli
Abstract Scope This study investigates hydrogen embrittlement mechanisms in TiN/TiO₂-reinforced CoCrFeNi medium-entropy alloys produced via laser powder bed fusion (LPBF). Nanoindentation mapping was performed before and after electrochemical hydrogen charging to quantify mechanical property changes. Results revealed progressive matrix softening with hydrogen exposure, with hardness decreasing from 3.60 ± 0.10 GPa to 2.88 ± 0.13 GPa after 24-hour charging. Precession electron diffraction (PED) analysis beneath nanoindents showed that while uncharged specimens exhibited predominant deformation twinning, hydrogen-charged samples displayed subgrain formation directly under indents, indicating increased dislocation activity through hydrogen-enhanced localized plasticity (HELP). Thermal desorption spectroscopy (TDS) performed at different heating rates revealed insights into hydrogen's role in deformation mechanisms. The spatially heterogeneous deformation featured well-defined subgrains near indents and deformation twins at greater depths. Dispersed nanoparticles maintained their strengthening effect without interface embrittlement. These results provide critical understanding of hydrogen-microstructure interactions in additively manufactured nanoparticle-reinforced medium-entropy alloys for hydrogen-resistant structural applications.
Proceedings Inclusion? Planned:
Keywords Additive Manufacturing, High-Entropy Alloys, Mechanical Properties

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

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Additive Manufacturing: From Complex Alloys to Simple Alloys
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Dislocation Analysis of CrCoNi using Micropillar Experiments and Molecular Dynamics Simulations
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Ductile-Brittle Transitions in bcc Refractory High-Entropy Alloys
Dynamic properties of NbTaTiHf High-Entropy Alloy
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