Accession Number : AD0732507

Title :   Solute Segregation and Stresses Generated around Growing Voids in Metals,

Corporate Author : GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y

Personal Author(s) : Anthony,T. R.

Report Date : JUL 1971

Pagination or Media Count : 12

Abstract : A quantitative description of the solute segregation generated by vacancy currents around growing voids is given. Predictions of this theory are compared with direct measurements of vacancy currents, impurity currents, and solute segregation around voids in various metal alloys. From these experiments and theory, the atomic jump frequencies of vacancies around solute atoms in these alloys are obtained. Segregation around other vacancy sinks such as dislocations and grain boundaries is also considered. The effects of solute segregation on the surface energy of voids and the vacancy diffusion coefficient around voids are shown to lead in many cases to an increase in the total number of voids and a decrease in their average size. The stresses generated by solute segregation around voids are calculated. These stresses are shown to be capable of preventing void growth when solute segregation is excessive. Finally, it is suggested that long-range stresses generated by solute segregation around voids can lead to an ordering of voids on spatial arrays to minimize the elastic energy of a material. (Author)

Descriptors :   (*METALS, DEFECTS(MATERIALS)), SURFACE PROPERTIES, STRESSES, SEPARATION

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE