Diffusive phase transformations in metallic glasses

A large set of experimental results obtained by the author and colleagues related to the diffusionrelated effects and phase transformation observed in metallic glasses will be presented and discussed

Double-stage glass transition in a metallic glass

Glass-transition region is still a somewhat dark area in the field of materials science. In order to shed more light on this phenomenon, the glass-transition behavior was studied in a Zr(55)Cu(30)Al(10)Ni(5) glassy alloy by monitoring its specific-heat capacity measured using a differential scanning calorimeter during heating in a step-scan mode. This reduces the influence of kinetic effects which shield the transition. It is suggested that two types of relaxation (likely related to the diffusivities of different alloying elements Cu and Ni on the one hand as well as Zr and Al on the other hand) take place and compete in the glass-transition region

Diffusive phase transformations in metallic glasses

A large set of experimental results obtained by the author and colleagues related to the diffusionrelated effects and phase transformation observed in metallic glasses will be presented and discussed

On Long-Term Stability of Metallic Glasses

Thermal stability of different types of metallic glasses and partially crystalline alloys stored for at least 15 years at ambient conditions was tested in the present work by differential scanning calorimetry in comparison with that of the original alloys tested in the as-cast state in the earlier works. The structure of the naturally aged alloys was also studied by X-ray diffractometry. The structure of a couple of selected alloys was also tested by transmission electron microscopy. Most of the alloys retained their initial structure and showed only a moderate decrease in the crystallization temperature. Only those alloys which showed visible surface oxidation (Cu-Zr-system based) were partly transformed into a crystalline state forming micron-scale Cu particles in air at ambient conditions