|About this Abstract
||3rd World Congress on High Entropy Alloys (HEA 2023)
||Phase Stability in Refractory High Entropy Alloys
||Vishal Soni, SriSwaroop Dasari, Abhishek Sharma, Advika Rao Chesetti, Oleg N. Senkov, Daniel Miracle, Rajarshi Banerjee
|On-Site Speaker (Planned)
Al-containing refractory high entropy alloys or complex concentrated alloys (RHEAs or RCCAs) often exhibit a patterned BCC+B2 microstructure, resembling the FCC+L12 microstructure typically observed in Ni/Co base superalloys. There is a rapidly growing interest in these BCC+B2 microstructures, especially due to their promising balance of elevated temperature mechanical properties. Unfortunately, such BCC+B2 microstructures are often reported to be unstable and upon long term annealing, results in transformation of the B2 phase to ordered omega phase which is detrimental to mechanical properties. The current study focuses on investigating the stability of BCC+B2 microstructure and the detrimental ordered omega phase in several Al-containing RHEAs at elevated temperatures (600C-1400C). The results are compared with CALPHAD based predictions to understand the stability of such phases and thus tune the alloy compositions to get elevated temperature stability of the BCC+B2 and at the same time, avoid the formation of undesired phases.
||Planned: Metallurgical and Materials Transactions