About this Abstract |
| Meeting |
TMS Specialty Congress 2026
|
| Symposium
|
4th World Congress on High Entropy Alloys (HEA 2026)
|
| Presentation Title |
In-Situ Spatiotemporal Characteristics of Deformation: From Microstructurally Simple Metals to Complex Concentrated Alloys |
| Author(s) |
Michal Knapek, Tomas Tayari, Eliska Jaca, Peter Minarik, Josef Pesicka |
| On-Site Speaker (Planned) |
Michal Knapek |
| Abstract Scope |
Plastic deformation is now recognized as inherently intermittent in space and time, governed by discrete events such as dislocation avalanches, twinning, and phase transformations that remain hidden in conventional stress–strain curves. Using complementary in-situ techniques, including acoustic emission and high-resolution imaging, we investigate deformation dynamics across length scales, from micron-scale specimens to bulk complex concentrated alloys (CCAs). As a representative case, FeAlCr-based CCAs were studied in compression over a range of temperatures and strain rates. An unusual serrated flow was observed and identified as dynamic strain aging (Portevin–Le Châtelier effect) through strain-rate jump tests, digital image correlation, and acoustic emission analysis. Significant microplastic activity was detected already in the quasi-elastic regime. Statistical analysis reveals power-law-distributed dislocation avalanches, indicating stochasticity and self-organization, remarkably persisting despite the microstructural complexity of CCAs. |
| Proceedings Inclusion? |
Undecided |