|About this Abstract
||1st World Congress on High Entropy Alloys (HEA 2019)
||High Entropy Alloys 2019
||Microstructures and Properties of As-Cast Al<sub>2.7</sub>CrFeMnV, Al<sub>2.7</sub>CrFeTiV, and Al<sub>2.7</sub>CrMnTiV High Entropy Alloys
||Keith E. Knipling, Richard Michi, David Beaudry
|On-Site Speaker (Planned)
||Keith E. Knipling
High entropy alloys (HEAs) typically contain five or more principal elements in nearly equiatomic proportions, significantly expanding the composition space and achievable properties of novel metallic materials. Here we present the microstructures and mechanical properties of arc-melted Al<sub>2.7</sub>CrFeMnV, Al<sub>2.7</sub>CrFeTiV, and Al<sub>2.7</sub>CrMnTiV HEAs. Metallographic analysis, powder X-ray diffraction, electron microscopy, and atom-probe tomography have revealed Al<sub>2.7</sub>CrFeMnV to be single-phase BCC with lattice parameter (a) of 0.2968 nm. Al<sub>2.7</sub>CrFeTiV is multiphase, with a high volume fraction of Al-rich G-phase precipitates in a BCC matrix (a = 0.3006 nm), with additional other precipitates. Al<sub>2.7</sub>CrMnTiV contains Ti-rich FCC precipitates (a = 0.3043 nm) in a BCC matrix (a = 0.3946 nm). These experimental results are compared with the equilibrium phases predicted by thermodynamic modeling.