Crystallization in bulk metallic glasses

The onset of crystallization in the Vitreloy 1 alloy shown in Fig. 1.3 was based on the detection of a crystalline volume fraction of 10 by conventional methods. There are two different curves for the onset of crystallization in Fig. 1.3. For the solid curve, which was obtained using classical nucleation theory, the effective diffusion constant was taken to be proportional to the reciprocal of the viscosity, which was considered to be of the VFT form. The dotted curve was obtained by the use of an Arrhenius form of expression for the effective diffusion constant, which was found to fit better at lower temperatures near Tg (Masuhr et al. 1999). This discussion shows that for understanding the kinetics of crystallization in multi-component alloys considerable improvisation becomes necessary. 

11 Deformation-induced aiterations of atomic structure in sub-cooled iiquids and giasses 

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Lin, X.H. Johnson, W.L. Rhim, W.K (1997). Effect of oxygen impurity on crystallization of an undercooled bulk glass forming Zr-Ti-Cu-Ni-Al alloy. Materials Transactions JIM, Vol. 38, No. 5, (May 1997), pp. 473-477, ISSN 0916-1821 Lohwongwatana, B. Schroers, J. Johnson, W.L. (2006). Strain rate induced crystallization in bulk metallic glass-forming liquid. Physical Review Eetters, Vol. 96, No. 7, (Febuary 2006), pp. 075503, ISSN 0031-9007... 

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