|About this Abstract
||1st World Congress on High Entropy Alloys (HEA 2019)
||High Entropy Alloys 2019
||Atomic-scale Investigation of Deformation Substructures of High Entropy Alloy CoCrFeMnNi Subjected to High Strain Rates
||Daniel L. Foley, Shang-Hao Huang, Elaf Anber, Logan Shanahan, Christopher M. Barr, Andrew C. Lang, Leslie Lamberson, Mitra L. Taheri
|On-Site Speaker (Planned)
||Daniel L. Foley
The single-phase high entropy alloy (HEA) CoCrFeMnNi is an interesting material not only due to its interesting physical properties, but also because it is a unique framework to study otherwise conventional deformation mechanisms of FCC alloys. Owing to its chemical disorder, this alloy is thought to possess unique properties such as a localized, non-uniform stacking fault energy and a highly distorted lattice, both of which can be contrasted with conventional single-phase alloys. In the present study we investigate the microstructures of single-phase CoCrFeMnNi deformed at high strain rate via Kolsky compression testing. We quantitatively analyze the deformation microstructures using electron backscatter diffraction in SEM, as well as precession electron diffraction in TEM. We observe the formation of both deformation twins and microbands in dynamically loaded specimens and attribute these features in part to the unique atomic structure of HEAs.