|About this Abstract
||1st World Congress on High Entropy Alloys (HEA 2019)
||High Entropy Alloys 2019
||Investigation on Elastic and Plastic Deformation Behaviors of Refractory High-entropy Alloy at Elevated Temperatures via In-situ Neutron Studies
||Chanho Lee, Gian Song, Yi Chou, George Kim, Tingkun Liu, Ke An, Wei Chen, Yi-Chia Chou, Yanfei Gao, Peter K Liaw
|On-Site Speaker (Planned)
||Peter K Liaw
Single solid-solution phase refractory high-entropy alloys (HEAs) show remarkable mechanical properties, such as the high yield strength and excellent ductility, due to their severe lattice distortions. Hence, extensive experimental and theoretical efforts have been conducted to design and develop single-phase body-centered-cubic (BCC) refractory HEAs and verify deformation mechanisms. In this study, we have investigated the elastic- and plastic-deformation behavior of a single BCC NbTaTiV refractory HEA at elevated temperatures, using integrated in-situ neutron-diffraction experiments, density functional theory (DFT) calculations, and finite-elements methods (FEM). The in-situ neutron-diffraction results reveal a deformation transition from the isotropic to anisotropic deformations in the elastic regime at high temperatures. Furthermore, the type of mobile dislocation as a function of macrostrains are quantitatively calculated and predicted by Williamson-hall-plot profile modeling. It is found that the edge dislocations can be the dominant dislocation type for the BCC refractory HEAs during plastic deformation.