|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Multi-Principal Elements Alloys X
||Expanding the design space of Ti-V-Nb-Hf refractory high-entropy alloys through Al-alloying
||Shaolou Wei, Cem Tasan
|On-Site Speaker (Planned)
Because of their promising yield preservation trend at elevated temperatures, refractory high-entropy alloys (RHEAs) have drawn increasing attention in seeking optimal mechanical performances and exploring the underlying physical foundations. However, the apparent brittleness at ambient temperature, the necessity of extensive thermo-mechanical processing, and the presence of catastrophic oxidation, still remain serious challenges. Our previous work has detailed the development of a Ti-V-Nb-Hf RHEA family that exhibits promising tensile ductility at room temperature. In this presentation, we aim to further explore the property design space of this particular RHEA system via Al alloying. The following three topics will be revealed in greater depth: (1) how much intrinsic strengthening (or softening) is associated with Al alloying? (2) how will dislocation plasticity micro-mechanisms vary in response to Al alloying? and (3) how does Al modulate the phase stability and thereby precipitation pathways at intermediate temperatures?
||High-Entropy Alloys, Phase Transformations, Characterization