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Meeting 2026 TMS Annual Meeting & Exhibition
Symposium Advances in Multi-Principal Element Alloys V: Mechanical Behavior
Presentation Title Dislocation Analysis of CrCoNi using Micropillar Experiments and Molecular Dynamics Simulations
Author(s) Mobin Vandadi, Fatemeh Ghajari, Nima Rahbar
On-Site Speaker (Planned) Mobin Vandadi
Abstract Scope We investigate the influence of short-range order (SRO) and strain rate on the deformation behavior of single-crystalline CrCoNi medium entropy alloys using micropillar compression, transmission electron microscopy (TEM), and molecular dynamics (MD) simulations. TEM reveals early-stage plasticity via Shockley partial dislocations and stacking faults at 0.05% strain, with spatial variability attributed to local differences in stacking fault energy (SFE). MD simulations of random and SRO atomic structures confirm that SRO suppresses twinning and favors uniform dislocation glide. Generalized stacking fault energy calculations further show that local chemistry modulates the energy landscape, impacting the deformation pathway. These combined results highlight the crucial role of chemical ordering and rate effects in governing the microscale plasticity of FCC high/medium entropy alloys.
Proceedings Inclusion? Planned:
Keywords High-Entropy Alloys, Characterization, Modeling and Simulation

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