Influence of structure and composition on atomic mobility in Ni(Al)-based solid solutions and Ni3Al-based intermetallics

T. TARFA; C. DIMITROV; O. DIMITROV

doi:doi:10.1051/jp4:1993771

Numéro		J. Phys. IV France Volume 03, Numéro C7, Novembre 1993 The 3rd European Conference on Advanced Materials and Processes Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés


Page(s)		C7-453 - C7-456
DOI		https://doi.org/10.1051/jp4:1993771

The 3rd European Conference on Advanced Materials and Processes
Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés

J. Phys. IV France 03 (1993) C7-453-C7-456
DOI: 10.1051/jp4:1993771

Influence of structure and composition on atomic mobility in Ni(Al)-based solid solutions and Ni₃Al-based intermetallics

T. TARFA, C. DIMITROV and O. DIMITROV

CECM-CNRS, 15 rue Georges Urbain, 94407 Vitry-sur-Seine cedex, France

Abstract
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.