Thermodynamic prediction of bulk metallic glass forming alloys in ternary Zr–Cu–X (X=Ag, Al, Ti, Ga) systems

A new thermodynamic parameter GCE for identification of glass forming compositions

“…The chemical enthalpy, which influences the degree of mixing for a binary system is usually based on the extended regular solution model [1]. It is written as…”

“…To justify accuracy of the proposed model in predicting glass forming systems, a comparison of the reported and reproduced results with the G CE parameter-identified, easy glass forming compositions, is carried out in V-Ti-Cr [22], Zr-Cu-Ag [1], Mg-Zn-Ca [23,24], Cu-Zr [26] and Ca-Mg-Cu [27] …”

“…Therefore, as a first approximation, this term is generally not considered in calculations. [1] It is thus understood that for any system, be it binary or multicomponent, a great deal of calculations must be carried out in the Miedema model to predict glass forming ability in various compositions. Basu et al [22] generated a ternary Isopleth to discover the solid solution forming compositions using the Miedema model (Fig.1).…”

“…Murty et al [1], postulated and employed the thermodynamic and topological parameters based HSS P model in predicting the best glass forming compositions in Zr-Cu-x (Ag, Al, Ti, Ga) systems. HSS P parameter can be described as…”

“…In situations where a large number of alloys have to be considered in the absence of a prior thermodynamic database, the Miedema model provides an excellent starting point. This model has been extensively used by Murty et al [1], Basu et al [8], and In any system, binary or higher order, the elastic enthalpy and chemical enthalpy of mixing plays an imperative role in affecting the phase stability. Egami [10] proved that increasing the number of elements involved, increasing the atomic size ratio, increasing the attractive force between small and large atoms, and introducing a repulsive potential between small atoms will help the formation of bulk metallic glasses.…”