| For crystalline metals the science, technology, and application of thermomechanical processing are established, but this is not true for glasses. Metallic glasses-because they can be plastically deformed-offer a unique opportunity to study the effects of thermomechanical treatments on the structure and properties of glasses. Depending on the rate of cooling, various glassy states can form from a liquid. Slower cooling gives states of lower enthalpy and smaller volume; such states might also be reached by annealing, which induces structural 'relaxation'. A reduction in the degree of relaxation, or 'rejuvenation', is achievable through processes such as irradiation and mechanical deformation. In this Review, we explore the extent of

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The effect of continuous heating and isothermal heat treatments on ductile Cu 60 Zr 20 Ti 20 amorphous ribbons was monitored by differential scanning calorimetry, x-ray diffraction, synchrotron radiation transmission, and high-resolution transmission electron microscopy. Upon continuous heating, the alloy exhibited a glass transition, followed by a supercooled liquid region and two exothermic crystallization stages. Decomposition of the amorphous phase was also observed. The first crystallization stage resulted in the formation of a nanocomposite structure with hexagonal Cu 51 Zr 14 particles embedded in the amorphous matrix, while in the second crystallization stage hexagonal Cu 2 TiZr-like phase was precipitated. The released enthalpies were 19 J/g and 30 J/g for each crystallization stage. Crystallization kinetics was studied by the classical nucleation theory. Deviations from the Johnson-Mehl-Avrami-Kolmogorov theory may be explained by the contribution of the decomposition of the amorphous matrix.

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