Mixing enthalpy of liquid phase calculated by miedema's scheme and approximated with sub-regular solution model for assessing forming ability of amorphous and glassy alloys

摘要

The forming ability of amorphous and glassy alloys has been assessed with mixing enthalpy (ΔH~(mix)) of a liquid phase based on Miedema's scheme. The ΔH~(mix)'s were calculated as a function of composition in an alloy for possible 2628 binary systems from 73 elements, and were approximated with interaction parameter Ω in a sub-regular solution model with coefficients Ω_i(i = 0 to 3) for a cubic function of composition. The results revealed that 2627 systems were fitted by Ω's within errors denoted by statistical adjusted R-square (R~2) ≥ 0.999, which includes R~2 = 1 for 2409 systems. The values of Ω_i for 1378 systems from 53 elements were selected and tabulated For assessing the forming ability of amorphous and glassy alloys. The analysis revealed that P and C in Fe-P and Fe-C binary alloys and simultaneous additions of Ni and Cu in La-, Zr- and Pd-based bulk metallic glasses exhibit a marked and peculiar composition dependence of ΔH~(mix). In a framework of Miedema's scheme, the most accurate values of ΔH~(mix) for a liquid phase have been provided as a function of composition in an alloy system, which makes it possible to consider the forming ability of amorphous and glassyalloys deeply.