| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phonons, Electrons and Dislons: Exploring the Relationships Between Plastic Deformation and Heat
|
| Presentation Title |
Shear Bands, Thermal Profiles and Microstructure Stability in Large-strain Deformation of High Entropy Alloys |
| Author(s) |
Shwetabh Yadav, Dhruvil Shah, Andrew Kustas, Nicolas Argibay, Ping Lu, Dinakar Sagapuram |
| On-Site Speaker (Planned) |
Dinakar Sagapuram |
| Abstract Scope |
We study the stability of plastic flow and microstructure in CoCrFeNiMn high entropy alloy under large strain and strain rate conditions. A 2D cutting (shear) apparatus is used to impose large shear strains in a single deformation pass under high strain rates > 10<sup>3</sup> per second. A clear transition in the flow from homogeneous type to localized shear banding, upon increasing the strain rate, is demonstrated. Using high-resolution TEM characterization, we show that shear bands exhibit a highly-refined nanocrystalline microstructure and possess exceptional phase stability despite extreme local deformation conditions (strains > 10, strain rates of 10<sup>5</sup>–10<sup>6</sup> per second). Planar heat source models are used to analyze deformation-induced heating effects in the vicinity of shear bands and interpret microstructure observations in terms of the characteristic diffusion times and thermal length-scales.SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Characterization, Other |