| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Radiation Effects in Metals and Ceramics
|
| Presentation Title |
Suppressing Void Swelling in NiCoFeCr-based High Entropy Alloys via Selective Doping |
| Author(s) |
Zhe Fan, Yang Tong, Shijun Zhao, Gihan Velisa, Fuxiang Zhang, Hongbin Bei, Yanwen Zhang |
| On-Site Speaker (Planned) |
Zhe Fan |
| Abstract Scope |
We report the effects of doping on irradiation-induced void swelling in NiCoFeCr-based high entropy alloys (HEAs). In (NiCoFeCr)1-xPdx, the addition of Pd up to 3% leads to smaller voids with higher density, and void nucleation is largely inhibited with Pd at 5%. High-density voids form near the free surface in (NiCoFeCr)99Pd1 but not in other alloys. The suppressed void swelling and suppressed dislocation growth are attributed to enhanced sluggish diffusion due to the large size factor and local lattice distortion revealed by X-ray diffraction and total scattering measurements. Density functional theory calculations show that doping Al can substantially increase the vacancy migration energy, and experimentally we show that void swelling is better suppressed in (NiCoFeCr)99Al1 than (NiCoFeCr)99Pd1 or (NiCoFeCr)99Cu1. This study provides insights to enhance swelling resistance in HEAs through selective doping. This work was supported by EDDE, an EFRC funded by the U.S. DOE, BES. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |