| Abstract Scope |
Three high entropy alloys that have potential as lightweight structural materials have been studied using a combination of atom probe tomography (APT), electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), and X-ray diffraction (XRD) as well as predictions from Thermo-Calc. The first alloy, Al<sub>2.7</sub>CrFeMnV, is a single-phase bcc, consistent with Thermo-Calc predictions. The two other alloys contain multiple phases. The second alloy, Al<sub>2.7</sub>CrFeTiV, is a solid solution bcc matrix with an Al-rich G-phase and a Laves phase rich in Ti and Cr. These were all present in the Thermo-Calc predictions. The third alloy, Al<sub>2.7</sub>CrMnTiV, is also bcc with an L1<sub>0</sub> phase, which was predicted by Thermo-Calc. Additionally, a nanoscale B2 phase in the form of coherent ~10 nm B2 cuboids is formed, resembling the γ-γ' microstructure of Ni-based superalloys but in a bcc system. |