Correlation between mechanical properties and thermodynamic parameters of dual-fcc-phase CoCrFeCuxNi (x=1, 1.71) and CoCu1.71FeMnNi

Abstract In this study, the correlations between the total enthalpies and microstructural/mechanical properties of dual-fcc-phase CoCrFeMnNi, CoCrFeCu1.71Ni and CoCu1.71FeMnNi were studied. The reduction of mixing enthalpy (ΔHmix) and lattice strain energy (ΔHel) act as the driving force for phase-separation and induces the dual-fcc-phase structure The reduction of chemical enthalpy/lattice strain energy (ΔHtot = ΔHmix + ΔHel) upon phase separation was calculated to be 5.44 KJ/mol, 2.89 KJ/mol and 0.72 KJ/mol for CoCrFeCu1.71Ni, CoCrFeMnNi and CoCu1.71FeMnNi, respectively. The phase separation distance is dependent on reduction of ΔHtot and the average distance increased with increase of ΔHtot. The correlation between the mechanical properties and thermodynamic parameters was demonstrated through the interrelationship between strength, spacing of dendritic and/or lamella structure and thermodynamic parameters.