|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Multi-Principal Elements Alloys X: Alloy Development and Properties
||Strengthening Mechanisms and Deformation Behaviors in Single BCC Phase Refractory High-entropy Alloys
||Chanho Lee, George Kim, Yi Chou, Michael C Gao, Ke An, Gian Song, Yi-Chia Chou, Wei Chen, Nan Li, Saryu J Fensin, Peter K. Liaw
|On-Site Speaker (Planned)
Single-phase solid-solution refractory high-entropy-alloys (RHEAs) show remarkable mechanical properties, such as high yield strength with significant softening resistance at elevated temperatures. Hence, the in-depth study of the deformation behaviors for body-centered-cubic (BCC) RHEAs is a critical issue to explore the uncovered/unique deformation and strengthening mechanisms. We have investigated the elastic- and plastic-deformation behaviors of a single BCC NbTaTiV and NbTaTiVZr RHEAs, using integrated experimental efforts and theoretical calculations. The in-situ neutron-diffraction results reveal a transition of the elastic-deformation feature from isotropic to anisotropic modes at elevated temperatures. Furthermore, we have systematically and quantitatively determined lattice distortion using a theoretical model, first-principles calculations, synchrotron X-ray/neutron diffraction, and scanning-transmission-electron microscopy techniques. These results demonstrate that severe lattice distortion is a core factor for developing high strengths in RHEAs.
||High-Entropy Alloys, High-Temperature Materials, Mechanical Properties