ANELASTICITY AND STRUCTURAL STABILITY OF NANOSTRUCTURED METALS AND COMPOUNDS

Internal friction and dynamic elasticity moduli on thin reeds of nanos tructured Al, Fe, FeAl and Fe3Al intermetallics prepared by ball milli ng have been measured. A relaxational damping peak in pure metals at 3 50-500 K and a modulus increase at 450-500 K without appreciable grain growth has been defected. Moreover, magnetoelastic coupling dependent on grain size has been observed in iron. In the nanophase intermetall ic aluminides a strong relaxational damping peak was observed in the 7 00-800 K range. These results are briefly discussed with reference to the anelastic behaviour of similar coarse grained materials.