About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Deformation Mechanisms, Microstructure Evolution, and Mechanical Properties of Nanoscale Materials
|
Presentation Title |
G-15: Orientation Dependent Micro-mechanical Deformation Behavior of Refractory High Entropy Alloy as a Function of Strain Rate and Temperature |
Author(s) |
Shristy Jha, Sundeep Mukherjee, Saideep Muskeri, Maryam Sadeghilaridjani, Abhishek Sharma, Sriswaroop Dasari, Rajarshi Banerjee, Yu-Chia Yang |
On-Site Speaker (Planned) |
Shristy Jha |
Abstract Scope |
Refractory high entropy alloys (R-HEAs) have attracted widespread scientific and technological interest due to their superior properties compared to conventional refractory metals. Here, the deformation behavior of a single-phase body centered cubic R-HEA, namely HfTaTiVZr, was evaluated by micropillar compression at different strain rates over a range of temperatures for two orientations, namely [101] and [111]. There were significant differences in the strengths, strain hardening rates, deformation morphologies and strain rate sensitivities between the two orientations micropillars at room temperature (RT). These differences were attributed to the variations in the operative mechanisms of plasticity (TRIP vs dislocation plasticity), studied with the help of transmission electron microscopy for the two cases. Significant differences in micro-mechanical deformation behavior were observed as a function of temperature too, which was attributed to different underlying mechanisms, explored via in-situ deformation videos, post-compression images, and dislocation theory based molecular dynamics (MD) simulations. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Entropy Alloys, Mechanical Properties, Characterization |