Prediction of phase, hardness and density of high entropy alloys based on their electronic structure and average radius

According to a recent Hume-Rothery approach, the electron concentration, e/a, and average radius can be used identify domain of stability HEAs estimate phases that may occur in alloy. The present study investigates influence electronic structure on hardness for series HEA alloys. alloys investigated this work all contained Co, Fe Ni as base elements. To system one or more elements were added, including Al, Cr, Cu, Sn, Pd, Ru, Ti, V different proportions. For comparison, data identified have been taken from wide range bibliography other types systems Co-Cr-Fe-Cu-A-B-C-D-E-F, with A, B, C, D, E, F = V, Nb, Mo, Mn, Si, Y, Sc, Re, Gd, Dy, Ho, Lu, Tb, Er, Tm, La, W, Ta, Hf, Zr. In order predict occurrence mainly fcc, bcc hcp phases, atomic is preferable over 12 nearest atoms neighbourhood. Based [e/a; radius] system, it shown composition predicted. By using classification, possible determine compositions adequate hardness, density present. consequences such predictions when modelling mechanical behaviour fundamental their application.