Magyar Tudományos Akadémia
Glassy state and relaxation processes
There is still a great interest concerning nanocrystalline soft magnetic alloys. Their ultra soft magnetic properties are developed during thermal treatments of amorphous (glassy) precursors via structural relaxation and crystallization processes. Structural relaxation takes place below the glass transition temperature (Tg), during which the frozen-in liquid structure reaches an equilibrium via short range atomic rearrangements. When the temperature of heat treatment exceeds the glass transition, long-range diffusion processes are activated, leading to amorphous-crystalline transformation. The study of the glass transition in metallic glasses and its kinetic is of importance in establishing conditions of thermal treatment. In this presentation, some experimental aspects of observing the glass transition in such different type of substances as polystyrene and metallic glasses will be presented. On the example of a Fe80Cr5B15 amorphous alloy, the relaxation processes in relation with the glass transition will be reported.
2005. február 22. (kedd) de. 10:00
I. épület Tanácsterem
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