|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Multi-Principal Elements Alloys X
||Dynamic Deformation Behaviors in Single BCC Phase Refractory High-entropy Alloys
||Chanho Lee, Mathew Hayne, Peter K Liaw, Nan Li, Saryu J Fensin
|On-Site Speaker (Planned)
Refractory high-entropy-alloys (RHEAs) show remarkable mechanical properties, such as high yield strength with significant softening resistance. Due to these excellent mechanical properties during quasi-static deformation, the RHEAs have attracted significant attention as potential metallic materials for the high temperature applications. To broaden the applications of RHEAs, the dynamic deformation behaviors/mechanisms and microstructural evolution at elevated temperature should be investigated and revealed. In this study, we have studied the deformation behaviors of single-BCC-phase NbTaTiV and NbTaTiV RHEAs during quasi-static and dynamic deformations (strain rate between 10-4 to 2,500 s-1). The high strain-rate compression tests were performed by Split Hopkinson Pressure Bar (SHPB) techniques. It is found that the NbTaTiV shows no working hardening/softening at elevated temperatures and the yield strength does not strongly depend on strain-rates. The evolutions of microstructure during dynamic deformation at elevated temperatures were systematically investigated by electron back-scattered diffraction (EBSD) to further verify the deformation mechanisms.
||High-Entropy Alloys, High-Temperature Materials, Mechanical Properties