Novel amorphous and nanostructured Al-based alloys

Studying the glass forming ability and devitrification of Al-based amorphous alloys we have prepared novel amorphous alloys which have primordial importance for preparation of compacts with the highest temperature stability and strength. The main results of the study are: 1. I have applied data processing methods known in the literature for Al-based amorphous alloys (both for the own and literature data) which was useful to place the Al-based alloys among the other metallic glasses (based on Zr, Fe, Cu,etc.) based on some physical characteristics, like heat of mixing, atomic mismatch, crystallization temperature and hardness: 1.1.A combination of the heat of mixing and atomic mismatch parameters have been used to assess the GFA of Al-based alloys.It can be stated that for Al based amorphous compositions the DeltaH is between -9 and -20 kJ/mole whereas for bulk metallic glasses (based on Fe, Cu, Pd, etc.) DeltaH is between -25 and -40 kJ/mole [S1,S2].The low GFA of Al based alloys can be attributed to relative low heat of mixing and low relative atomic volume differences of constituent elements. In addition, the lack of deep eutectic at the high Al concentration contributes to the low GFA.

Autorentext

Dr. Éva Fazakas graduated from the Eötvös Loránd University as post graduated level ( PhD) in 2011. Her research interest are novel bulk Al-based alloys with high content of Al have been produced by powder metallurgy and induction melting methods from amorphous and partially amorphous materials.