| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys II
|
| Presentation Title |
Role of Local Chemical Order on Phase Stability and Passivation in High Entropy Alloys |
| Author(s) |
Elaf A. Anber, Debashish Sur , Daniel Foley, Diana Farkas, Peter Liaw, John Scully, Mitra Taheri |
| On-Site Speaker (Planned) |
Elaf A. Anber |
| Abstract Scope |
High entropy alloys (HEAs) have attracted the major interest due
to their novel mechanical and structural properties. Local chemical ordering (LCO) plays
an important role in determining thermal and electrical conductivity of solid
solutions, diffusion, and passivity of alloys. Here, we examined the role of LCO on orientation relationship (ORs) of BCC precipitates in Al0.3CoCrFeNi via using in-situ and ex-situ TEM heating techniques, where we report a new BCC-ORs due to local chemical
fluctuations. Furthermore, the effect of short-range order (SRO) on alloy passivation will be presented, and the influence of the new BCC-ORs and microstructure changes on the corrosion resistance of HEA will be discussed. These studies were coupled with Extended Electron Energy Loss Fine Structure (EXELFS) and Energy-dispersive X-ray spectroscopy (EDS). Additional insight is obtained from molecular dynamics atomistic simulations that examine the various possible ORs and interface dislocations for the B2 precipitates in these Al containing HEA’s. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Phase Transformations, Characterization |