|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||High Entropy Alloys VIII
||Phase Inversion in Refractory High Entropy Alloys
||Vishal Soni, Sriswaroop Dasari, Bharat Gwalani, Talukder Alam, Oleg N Senkov, Daniel Miracle, Rajarshi Banerjee
|On-Site Speaker (Planned)
Refractory high entropy alloys (RHEAs) have been reported to exhibit higher strengths at elevated temperatures, as compared to conventional nickel base super alloys. Few of the Al-containing RHEAs exhibit an “inverted” superalloy-like microstructure where the ordered phase (B2) is the continuous matrix with discrete disordered BCC precipitates, unlike Ni-base superalloys where the disordered FCC phases is the continuous matrix along with L12 precipitates. The continuous B2 in these RHEAs are likely to be responsible for their poor room temperature ductility. The ductility of one such alloy, Al-0.5NbTa0.8Ti1.5V0.2Zr, was drastically improved by changing its microstructure from a “BCC precipitates in a B2 matrix”, to a “B2 precipitates in a BCC matrix” during isothermal annealing within the miscibility gap. In present study, this microstructural evolution during isothermal annealing has been investigated by coupling high-energy beam synchrotron experiments, transmission electron microscopy (TEM), and atom probe tomography (APT).
||Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume