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Calculation of Supercooled Liquid Range and Estimation of Glass Forming Ability of Metallic Glasses using the Vogel Fulcher Tammann Equation

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Figure

Fig. 1Schematic diagrams showing the changes in (a) free volume (x) and(b) dx/dT with temperature of a metallic glass during rapid quenching (Ato C) and subsequent continuous heating (C to F).18) B: VFT parameter,T0: ideal glass transition temperature, Tg: glass transition temperature, Tx:onset temperature of crystallization, Tf: fictive temperature, x0: initial freevolume, xeq: equilibrium free volume.
Figure 3 shows the plots of dx/licand downward pointing arrows show thetively, and the resultingZr11 K for PdFrom this figure, it is apparent that theofZr T4646dTfor Ni, metal-glasses(Fe83B17,Pd40Cu30Ni10P20,Mg65Ni20Nd15,.75Ti8.25Cu7.5Ni10Be27.5) and SiO2 s
Fig. 4(a) Experimental data on the Rc − ∆Tx diagram for metallic glasses,2) and (b) calculated data for Ni, metallic glasses and SiO2systems.
Fig. 5Plots of (a) x, (b) dx/dT and the approximate solution (xap) calcu-lated by eq. (15) for Zr41.2Ti13.8Cu12.5Ni10Be22.5 metallic glass
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