| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phonons, Electrons and Dislons: Exploring the Relationships Between Plastic Deformation and Heat
|
| Presentation Title |
Role of Tantalum Concentration and Processing Temperature on High Strain Rate Phonon Behavior in Copper-tantalum Alloys |
| Author(s) |
Soundarya Srinivasan, Scott A Turnage, Billy C Hornbuckle, Chaitanya Kale, Kris A Darling, Kiran N Solanki |
| On-Site Speaker (Planned) |
Soundarya Srinivasan |
| Abstract Scope |
Microstructural instability in traditional nanocrystalline metals limits the understanding of grain size effects on mechanical behavior under extreme conditions like high temperature and loading rates. In this work, interplay between Ta concentrations and processing temperature on the resulting microstructure of a powder processed fully dense Cu-Ta alloy and their tensile behavior at different strain rates are investigated, to probe the possibility to tune microstructurally dependent parameters to control the flow-stress upturn phenomenon. Consequently, the results reveal that there is a crucial length scale, i.e., grain size and cluster spacing, below which phonon drag is damped out and above which phonon drag becomes progressively active. This observation of changes in phonon drag are consistent with the observed changes in measured plasticity/ductility, which presents itself as an inversion in tension ductility. Overall, this work demonstrates a systematic way to control the phonon drag effects in metallic alloys for high rate applications. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Other, Other, Other |