APPLICATION OF POSITRON ANNIHILATION SPECTROSOPY FOR CHARACTERIZATION AND MICROSTRUCTRAL STUDIES OF ULTRA-FINE GRAINED CUBIC METALS
2009
Abstract
Present Contribution is focused on investigations of bulk ultra-fine grained (UFG) cubic metals (Cu, Ni, Fe), prepared by severe plastic deformation (high-pressure torsion). Recent results obtained within Prague Dresden - Ufa collaboration are reviewed.
Positron annihilation spectroscopy (PAS) was employed as the main experimental technique in these studies, including conventional PAS as well as positron beam measurements. Defects, induced by deformation, were identified.
Their lateral and depth distributions were studied. The influence of preparation conditions and ceramic Al2O3 nanoparticles on thermal stability of UFG copper was examined.