|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||High Entropy Alloys VIII
||Thermal Expansion of Refractory MoWTaTiZr High Entropy Alloy
||Eric Osei-Agyemang, Ganesh Balasubramanian
|On-Site Speaker (Planned)
Though Ni-based superalloys exhibit superior performance at moderate temperatures, the quest for new class of materials becomes desirable at elevated temperatures and extreme working conditions as the Ni-based superalloys have low melting temperatures.
High entropy alloys (HEA) based on refractory elements may achieve higher temperature operations with superior creep strength. At elevated temperatures, Mo based HEAs have been observed to exhibit good thermal and mechanical properties. 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).
The usability of the recently identified Mo-W-Ta-Ti-Zr HEA at extreme working conditions is required. In this study, a Quasi-Harmonic Approximation (QHA) method is used to estimate the coefficient of thermal expansion (CTE) for refractory Mo-W-Ta-Ti-Zr HEA. We discuss the effect of composition on the mechanical properties and associated thermally driven mechanisms.
||Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume