| Abstract Scope |
Abstract: The microstructures formed in an Al<sub>2.7</sub>CrMnTiV high-entropy alloy are 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 thermodynamic predictions. In the as-cast state, the alloy consists of a body-centered cubic (bcc) matrix with micron-scale L1<sub>0</sub> lath-shaped precipitates, enriched in Al and Ti, that are predicted by thermodynamic predictions. Additionally, coherent B2 cuboids on the order of 10 nm are formed, resembling the γ-γ' microstructure of Ni-based superalloys but in a BCC system. We study the precipitation-hardening behavior by solutionizing and aging the alloy, and measuring the mechanical properties after aging. |