||Louis J. Santodonato, Yang Zhang, Mikhail Feygenson, Chad Parish, Michael Gao, Richard Weber, Joerg Neuefeind, Zhi Tang, Peter K. Liaw
Locally-strained crystal structures, due to multiple elements of different sizes in solution, affect the excellent properties of high-entropy alloys, such as high strength. Therefore, it is essential to understand the detailed elemental distributions, on the local and long-range scales. Here, the Al1.3CoCrCuFeNi model alloy is examined, using integrated theoretical and experimental techniques, such as ab initio molecular dynamics simulations, neutron scattering, synchrotron X-ray diffraction, high-resolution electron microscopy, and atom-probe tomography. It is shown that even when the material undergoes elemental segregation, precipitation, chemical ordering, and spinodal decomposition, a significant amount of chemical disorder and local strain remains, due to the distributions of multiple elements in the major phases. The results suggest that the high-entropy-alloy-design strategy may be used to develop a wide range of complex materials, which are not limited to single-phase solid solutions.