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

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 degrees C.