|About this Abstract
||1st World Congress on High Entropy Alloys (HEA 2019)
||High Entropy Alloys 2019
||Microstructure Evolution in CoCrFeMnNi High-entropy Alloy by Localized Shear Deformation
||Ryohei Serada, Alok Singh, Ivan Gutierrez-Urrutia, Koich Tsuchiya, Toshiji Mukai
|On-Site Speaker (Planned)
High entropy alloys (HEAs) have attracted attention due to their superior combination of strength and other mechanical properties as novel multi-component alloys. Understanding the deformation mechanisms in HEAs is important for their application as structural components and/or to improve their mechanical properties. In this study, microstructure evolution in a CoCrFeMnNi HEA was investigated upon localized shear deformation. The HEA was quasi-statically and dynamically deformed at room temperature by a shear experiment. Microctructure characterization by SEM/EBSD revealed formation of shear band near the localized shear region. Finite element analysis in a double shear specimen model with the similar dimensions suggested that a certain amount of equivalent plastic strain promoted the formation of the localized shear band. EBSD analysis indicated that the shear bands were subdivided by nano-twins, and an early stage of shear localization in the HEA involved the formation of twin/matrix lamellae aligned along the shear direction.