Abstract
Positron annihilation spectroscopy was performed in order to study the influence of preparation route and processing on atomic free volumes in amorphous and nanocrystalline aluminium alloys. In melt-spun amorphous Al 88 Y 7 Fe 5 , structural free volumes smaller than a lattice vacancy are predominant, whereas in amorphous Al 92 Sm 8 prepared by repeated cold rolling larger free volumes occur. In the early stages of nanocrystallization of Al 88 Y 7 Fe 5 , an indication of Y enrichment at interfacial free volumes in the growth front of the Al nanocrystallites is found.
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