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

• Published in: Intermetallics Vol. 18; no. 9; pp. 1779 - 1789
• Main Authors: Takeuchi, A., Inoue, A.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.09.2010
• Subjects: Alloys; Approximation; B. Glasses, metallic; B. Thermal properties; B. Thermodynamic and thermochemical properties; E. Phase stability, prediction; Enthalpy; F. Calorimetry; Forming; Glassy; Liquid phases; Mathematical models; Zirconium; E. Phase stability, prediction; B. Glasses, metallic; F. Calorimetry; B. Thermal properties; B. Thermodynamic and thermochemical properties
• ISSN: 0966-9795; 1879-0216
• DOI: 10.1016/j.intermet.2010.06.003

The forming ability of amorphous and glassy alloys has been assessed with mixing enthalpy (Δ H mix) of a liquid phase based on Miedema’s scheme. The Δ H 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 Δ H mix. In a framework of Miedema’s scheme, the most accurate values of Δ H 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 glassy alloys deeply.