| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Atom Probe Tomography for Advanced Characterization of Metals, Minerals and Materials III
|
| Presentation Title |
Coupled APT and TEM Investigation of Cu Assisted Nucleation of L12 Precipitates in FCC-based High Entropy Alloys |
| Author(s) |
Bharat Gwalani, Sriswaroop Dasari, Vishal Soni, Rajarshi Banerjee |
| On-Site Speaker (Planned) |
Rajarshi Banerjee |
| Abstract Scope |
Second phase precipitation in high entropy alloys (HEAs) or complex concentrated alloys (CCAs) can be rather complex due to the multi-component system coupled with the competition between multiple possible phases. This study will focus on Cu clustering and its impact on L12 precipitation in FCC-based high entropy alloys (HEAs), Al0.3CuCrFeNi2 and Al0.3Cu0.3Ti0.2CrFeNi. Detailed characterization via coupling of APT, SEM, and TEM reveal novel insights into Cu clustering within the FCC matrix of these HEAs, leading to heterogeneous nucleation sites for the gamma prime precipitates. The subsequent partitioning of Cu into the gamma prime precipitates indicates their stabilization due to Cu addition. The role of Cu revealed by this study can be employed in the design of precipitation strengthened HEAs, as well as in a more general sense applied to other types of superalloys, with the objective of potentially enhancing their mechanical properties at room and elevated temperatures. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |