Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés
J. Phys. IV France 03 (1993) C7-453-C7-456
Influence of structure and composition on atomic mobility in Ni(Al)-based solid solutions and Ni3Al-based intermetallicsT. TARFA, C. DIMITROV and O. DIMITROV
CECM-CNRS, 15 rue Georges Urbain, 94407 Vitry-sur-Seine cedex, France
Atomic mobility was characterized by investigating the isothermal relaxation of short-range order (SRO) in a Ni(Al, Ti) solid solution and of long-range order (LRO) in three intermetallic compounds Ni3Al, Ni3(Al, Ti) and Ni3(Al, Ta) by means of residual resistivity measurements. The relaxation in the intermetallics was much slower than in the solid solutions and in both cases the kinetics were strongly affected by a partial substitution of Al by Ti or Ta. The application of power law kinetics led to the determination of relaxation time-constants, and in the solid solutions to the corresponding activation enthalpies for self-diffusion.
© EDP Sciences 1993