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Meeting 2026 TMS Annual Meeting & Exhibition
Symposium Advances in Multi-Principal Element Alloys V: Mechanical Behavior
Presentation Title Spatiotemporal Characteristics of Deformation in FeAlCr-Based Complex Concentrated Alloys Investigated Using In Situ Techniques
Author(s) Michal Knapek, Tomas Tayari, Eliska Jaca, Peter Minarik, Josef Pesicka
On-Site Speaker (Planned) Michal Knapek
Abstract Scope This study investigates plastic instabilities and microplasticity in FeAlCr-based CCAs under compression. An unusual serrated flow was observed at certain temperature and strain rate ranges. To probe the deformation mechanisms, temperature and strain rate were systematically varied. Compression curves, strain rate jump tests and digital image correlation indicate that the jerky flow results from dynamic strain aging, identified as the Portevin–Le Châtelier effect. Acoustic emission signals recorded during testing show significant microplastic activity already in the quasi-elastic regime. Statistical analysis of AE signals suggests that the serrated flow is governed by dislocation avalanches following a power-law distribution, indicating stochasticity and self-organization in plastic deformation. These features are commonly observed in pure metals and dilute alloys, while, given the microstructural complexity, their presence in CCAs is rather intriguing.
Proceedings Inclusion? Planned:
Keywords Characterization, High-Entropy Alloys, Mechanical Properties

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