Impact of tungsten on phase evolution in nanocrystalline AlCuCrFeMnWx (x = 0, 0.05, 0.1 and 0.5 mol) high entropy alloys

Abstract

The present study describes the synthesis and preliminary characterization of a novel nanocrystalline AlCuCrFeMnWx (x = 0, 0.05, 0.1 and 0.5 mol) high entropy alloy (HEA) powders via mechanical alloying (MA). During MA, the formation of a supersaturated solid solution with the formation major BCC 1 and BCC 2 phase with minor FCC fraction in AlCuCrFeMnWx (x = 0, 0.05, 0.1 and 0.5 mol) HEAs. The average crystallite size of all HEA powder samples after 20 h of milling was less than 20 nm as determined by using Debye–Scherrer formula. The particle morphology and composition of present HEAs were investigated utilizing scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). TEM–SAED analysis of AlCuCrFeMnWx (x = 0, 0.05, 0.1 and 0.5 mol) HEAs concurred with XRD results. Phase and thermodynamical properties have been correlated in the case of AlCuCrFeMnWx (x = 0, 0.05, 0.1 and 0.5 mol) high entropy alloys. Differential scanning calorimetric (DSC) of these alloys suggested that there is no significant phase change occur up to 1000 °C.