Abstract
In the present study, different symmetrical and asymmetrical geometrical thermodynamic models such as Muggianu, Luck chou, Kohler, Colinet, Hillert, Toop, General solution model (GSM) were modelled by using the Redlich-Kister formalism for all the possible binary alloy system and then applied to FeCoNi(Mn-Si)x (x=0.0,0.1,0.25,0.5,0.75,1.0) HEAs at 1273 K (FCC phase). The results revealed that asymmetrical GSM model with a similarity coefficient ξ(ij)(k) of ~0.5 shows maximum negative excess Gibbs free energy (G1-2-E3-4-5) and associated activity coefficients (Υa) decreases with the elevation of excess energy as well as Mn-Si content. The Miedema semi-empirical model was also evaluated in order to confirm the G1-2-E3-4-5 and associated Υα greatly influenced by a high negative value of enthalpy of mixing (ΔΗmix) and melting temperature (Tm). These negative value of ΔΗmix and G1-2-3E-4-5 plays a significant role during the formation of the solid solution produced by non-equilibrium process i.e. mechanical alloying (MA). Therefore, an experimental approach has been carried out in the proposed alloy system on the basis of phase evolution, physical parameters such as lattice parameter (LP), crystallite size (Dcrystal), microstrain (es) and dislocation density (ρdis), microstructure and magnetic properties were performed at 300 K.
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