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Chemical interaction and changes in local electronic structure of Cr, Fe, Co,Ni and Cu transition metals (TMs) upon formation of an$Al_{8}Co_{17}Cr_{17}Cu_{8}Fe_{17}Ni_{33}$ compositionally complex alloy (CCA)have been studied by X-ray absorption spectroscopy and X-ray photoelectronspectroscopy. It was found that upon CCA formation, occupancy of the Cr, Co andNi 3d states changes and the maximum of the occupied and empty Ni 3d statesdensity shifts away from Fermi level ($E_f$) by 0.5 and 0.6 eV, respectively,whereas the Cr 3d empty states maximum shifts towards $E_f$ by 0.3 eV, comparedto the corresponding pure metals. The absence of significant charge transferbetween the elements was established, pointing to the balancing of the 3dstates occupancy change by involvement of delocalized 4s and 4p states into thecharge redistribution. Despite the expected formation of strong Al-TMs covalentbonds, the Al role in the transformation of the TMs 3d electronic states isnegligible. The work demonstrates a decisive role of Cr in the Ni localelectronic structure transformation and suggests formation of directional Ni-Crbonds with covalent character. These findings can be helpful for tuningdeformation properties and phase stability of the CCA.

Chemical Interaction and Electronic Structure in a Compositionally  Complex Alloy: a Case Study by means of X-ray Absorption and X-ray  Photoelectron Spectroscopy