Influence of Order-Disorder on Creep of a Superlattice Alloy

概要

論文の詳細を見る
A study has been made of the influence of order-disorder on the creep of a superlattice alloy Ni_3Fe. The results obtained strongly support the dislocation-climb mechanism. The activation energy for creep, independent of applied stress, slightly increases with the degree qf order: 45.8kcal/mol for disordered and 47.5±2.0kcal/mol for ordered phases. A discontinuity occurs at the critical temperature, i.e., 505℃ in the curves of creep rate versus the reciprocal of temperature. A remarkable acceleration of creep has been observed on the disordered alloys below T_c, which were obtained by quenching from 800℃, as compared with the rates expected from the values above T_c. A semi-quantitative theory has been proposed for such a configurational acceleration of creep in terms of order-disorder kinetics and dislocation processes in the super-lattice alloy of AB_3 f.c.c. type. In ordered alloys, the vacancy diffusion introducing the dislocation-climb is thought to be anisotropic with regard to the orientation of slip bands. This will result a significant difference in the stress dependence of creep rates in ordered phases from the one in disordered phases as observed here.
社団法人日本物理学会の論文
1959-04-05