| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Radiation Effects in Metals and Ceramics
|
| Presentation Title |
High Irradiation Resistance of Nanocrystalline W-based High Entropy Alloy |
| Author(s) |
Enrique Martinez Saez, Osman El-Atwani, Duc Nguyen-Manh, Matthew Schneider, Nan Li, Meimei Li, Arun Devaraj, Kevin Baldwin, Damian Sobieraj, Jan Wrobel, Stuart Maloy |
| On-Site Speaker (Planned) |
Enrique Martinez Saez |
| Abstract Scope |
A body-centered cubic W-based refractory high entropy alloy with outstanding radiation resistance has been developed. The alloy was grown as thin films showing a bimodal grain size distribution in the nanocrystalline and ultrafine regimes and a unique 4 nm lamella-like structure revealed by atom probe tomography (APT). Transmission electron microscopy (TEM) and X-ray diffraction show certain black spots appearing after thermal annealing at elevated temperatures. TEM and APT analysis correlated the black spots with second-phase particles rich in Cr and V. No sign of irradiation-created dislocation loops, even after 8 dpa, was observed. Furthermore, nanomechanical testing shows a large hardness of 14 GPa in the as-deposited samples, with near negligible irradiation hardening. Theoretical modeling combining ab initio and Monte Carlo techniques predicts the formation of Cr and V rich second phase particles and points at equal mobilities of point defects as the origin of the exceptional radiation tolerance. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |