Calculation of metastable free-energy diagrams and glass formation in the Mg–Cu–Y alloy and its boundary binaries using the Miedema model

The Y–Cu–Mg system in the 0–66.7at.% Cu concentration range: The isothermal section at 400°C

“…These authors described the ternary liquid as a simple combination of binary interaction parameters, being this description satisfactory in reproducing the experimentally determined melting point (730 K) of the Y 10 Cu 25 Mg 65 alloy. Hojvat de Tendler et al [11] combined the Miedema model with the Calphad method to calculate binary and ternary free energy diagrams in the same system. By comparing the calculated free energy diagrams of amorphous and crystalline phases these authors determined the glass forming region of the Y-Cu-Mg ternary system at 298 K and widely discussed their results with respect to the experimental information available on the amorphization of binary and ternary alloys of this system.…”

The ternary system Yb–Cu–Mg: Isothermal section at 400°C in the range from 0 to 67at.% Cu

“…Although research activities throughout the recent years have provided a wealth of information on phase diagrams, compound formation and crystal chemistry of RE-T-Mg (T ¼ transition metal) systems [2,3], little is known yet about the constitution of alloy systems with ytterbium. With respect to the small energy separation of the Yb 2þ / Yb 3þ ground states, ytterbium forms a series of intermetallic compounds with mixed and/or intermediate valence behaviour (f 13 -f 14 ).…”

“…X-ray single crystal data for two compounds in the Yb-Mg-Cu system (room temperature, u-scans, scan width 2 ; redundancy > 7) 80 Â 80 Â 54 mm3 27 Â 54 Â 54 mm 3…”

Phase Diagrams and Glass Formation in Metallic Systems

“…The only reported analysis have been obtained by merely extrapolating the binary systems [45] or by estimating the Gibbs free energy of the amorphous and solid phases by applying an extension of the semiempirical Miedema's model. [46] A number of experimental data on the amorphous phase has been incorporated in the assessment and a comparison between calculated and experimental results has been performed. The description of the ternary liquid phase has been carried out by extrapolation from the assessed binary parameters, using the conventional equation developed by Muggianu et al [4] Furthermore, ternary interaction parameters have been considered.…”