|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||High Entropy Alloys VIII
||J-47: Internal Oxidation of Refractory MoWTaTiZr HEA Using Periodic DFT and Atomistic Thermodynamic Modeling
||Eric Osei-Agyemang, Ganesh Balasubramanian
|On-Site Speaker (Planned)
High-temperature strength, toughness and oxidation resistance are exhibited by Ni-based superalloys. However, increasing the application temperatures for such alloys become problematic due to melting temperatures of around 1350oC. New class of materials that can withstand harsher conditions at elevated temperatures are therefore desirable.
High entropy alloys (HEA) based on refractory elements may achieve higher temperature operations with superior creep strength. Recently, a refractory Mo-W-Ta-Ti-Zr HEA was observed to exhibit greatly enhanced modulus of elasticity (3x at 300K) over near atomic cases and with higher moduli above 500K over commercial alloys (2.3x at 2000K).
In this study, the internal oxidation mechanisms in the Mo-W-Ta-Ti-Zr HEA is analyzed. In a previous study, the surface oxidation mechanism was studied. Further analysis into the internal oxidation mechanism provides a complete picture and understandingon the usability of the Mo-W-Ta-Ti-Zr refractory HEA under oxidizing and corrosive environments
||Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume