| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Nanostructured Materials in Extreme Environments III
|
| Presentation Title |
Nanocrystalline Structures in HEAs by Extreme Deformation |
| Author(s) |
Carlos J Ruestes, Marc A. Meyers, Aomin Huang, Enrique J Lavernia |
| On-Site Speaker (Planned) |
Aomin Huang |
| Abstract Scope |
HEAs are quite resistant to shear localization, and this makes them good candidates for ballistic applications as armor materials. Forced shear deformation using hat-shaped specimens in a Hopkinson pressure bar configuration can generate plastic deformation with shear strains of 8 and higher in a localized region, at a strain rate on the order of 10^4 s^-1. The structure inside of these regions consists of nanocrystalline grains. The process by which these unique structures is formed involves a sequence of high-density dislocations, twins, and stacking faults, which evolve into elongated subgrains with low-angle grain boundaries. These break up at still higher strains and yield nanometer-sized grains that are equiaxed. Meanwhile, a propensity for deformation-induced features is revealed in the interior of the nanograins. We present evidence of this nanostructural evolution and describe the process of rotational dynamic recrystallization by which it forms. Implications for the dynamic performance of HEAs are discussed.
|
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Nanotechnology, Characterization |