Accession Number : AD0267518

Title :   THE EFFECT OF TEMPERATURE ON DISLOCATIONS WITH CONDENSED IMPURITY ATMOSPHERES. THEORY OF DISLOCATION MOTION AND DISLOCATION BREAK-AWAY

Corporate Author : METAL HYDRIDES INC BEVERLY MASS

Personal Author(s) : LOTHE,JENS

Report Date : DEC 1961

Pagination or Media Count : 1

Abstract : A simple model is used to exemplify the consequences of a statistical-mechanical treatment of condensed impurity atmospheres. As regards mechanical properties the all-important factor is the concentration of unoccupied impurity sites (holes) along the dislocation. The dislocations will tend to align themselves so that they accommodate impurities as efficiently as possible. Thus, the impurity interaction will lead to a sort of Peierls' barrier. Because the impurities line up the dislocations in valleys of maximum impurity interaction, on heating the dislocations will boil off the impurities in one or several quite well defined peaks. Finally a qualitative discussion of how the effect of an intrinsic Peierls' barrier might be incorporated in the theory is given. (Author)

Descriptors :   *METAL CRYSTALS, *STRESSES, *TEMPERATURE, CREEP, CRYSTAL LATTICES, CRYSTAL STRUCTURE, DEFORMATION, ENERGY, EQUATIONS, IMPURITIES, MECHANICAL PROPERTIES, PARTIAL DIFFERENTIAL EQUATIONS, PHYSICAL PROPERTIES, STATISTICAL ANALYSIS, THERMAL STRESSES

Distribution Statement : APPROVED FOR PUBLIC RELEASE