|About this Abstract
||3rd World Congress on High Entropy Alloys (HEA 2023)
||Investigating the Stability of a Al0.5NbTa0.8Ti1.5V0.2Zr BCC/B2 RCCA
||Julian L. Brodie, Junxin Wang, Jean-Philippe Couzinie, Milan Heczko, Veronika Mazanova, Michael Mills, Maryam Ghazisaeidi
|On-Site Speaker (Planned)
||Julian L. Brodie
Recently, the AlNbTaVTiZr class of BCC/B2 Refractory Complex Concentrated Alloys (RCCAs) have drawn increased interest as the bcc analogue to the well-known Ni-based super alloys with gamma/gamma’ microstructure. Previous experimental results on the microstructure of these alloys have been varied where some have found the formation of brittle phases within the BCC matrix along with the B2 precipitates. Since the mechanical properties of these alloys are highly dependent on their microstructure, it’s crucial to understand why these phases form. We use Density Functional Theory to study the phase stability of the B2 phase in a BCC/B2 Al0.5NbTa0.8Ti1.5V0.2Zr RCCA. We calculate the formation energy using DFT and study the effects of non-equilibrium conditions, such as temperature and strain, on the competing phases. We also explain how the microstructure is unstable and is prone to transform into an Omega, tetragonal, or hexagonal phase.
||Planned: Metallurgical and Materials Transactions