About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Characterization Techniques for Quantifying and Modeling Deformation
|
| Presentation Title |
Low-Temperature Peierls Stress Mapping in MAX Phases via Cryogenic Micropillar Compression |
| Author(s) |
Julia T. Purstl, Chunhua Tian, Amit Sharma, Thomas E.J. Edwards, Nicolò Maria della Ventura, Anderson Nascimento, Maxim Vreeswijk, Rob P. Thompson, Irene J. Beyerlein, Jakob Schwiedrzik, Johann Michler, William J. Clegg, Nicholas G. Jones |
| On-Site Speaker (Planned) |
Julia T. Purstl |
| Abstract Scope |
MAX phases are an ideal model system for exploring the crossover between metallic and ceramic deformation. Their unusual ductility stems from the anomalously easy glide of basal dislocations, yet a complete theoretical understanding of the factors governing their mobility remains open.
Building on recent MD and DFT work, this study experimentally evaluates the lattice resistance to basal dislocation motion in three representative MAX phases—Ti₃AlC₂, Ti₃SiC₂, and Cr₂AlC—using cryogenic micropillar compression. Supported by TEM and crystal plasticity FEA, the data facilitate extrapolation of activation volumes and Peierls stresses down to 0 K, enabling direct comparison with atomistic simulations.
The results confirm that core structures and bonding characteristics play a key role in MAX phase dislocation plasticity, and reveal a non-negligible contribution from dislocation interactions or forest hardening. These first cryogenic tests on MAX phases offer new insight for benchmarking simulations and advancing our understanding of low-temperature deformation in layered ceramics. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Ceramics, Characterization, Mechanical Properties |