Accession Number : AD0633004

Title :   DYNAMIC INTERACTIONS BETWEEN MOVING DISLOCATIONS AND SOLUTE ATOMS IN DILUTE SOLID SOLUTIONS.

Descriptive Note : Final rept. 1 Nov 64-31 Oct 65,

Corporate Author : RENSSELAER POLYTECHNIC INST TROY N Y

Personal Author(s) : Ansell,G. S.

Report Date : MAY 1966

Pagination or Media Count : 7

Abstract : The first aspect of the program concerned a theoretical model as to the effects of dilatational elastic strains upon the diffusivity of interstitial solute elements in metals. This work was extended to calculate the pipe diffusion of solute elements along edge dislocations as a function of both position within the cross section of the dislocation strain field and temperature. On the basis of this calculation, computation was made of the pickup of solute by moving dislocations in dilute solid solutions so as to be able to predict the stress-velocity relationships of dislocations in metals. The second aspect of the program concerned the development of an experimental study to determine the validity of both the general dislocation calculation and of the quantitative predictions derived. This work centered upon the design and construction of a gaseous diffusion apparatus in which the mass transport of diffusing species through metals could be quantitatively measured as a function of the defect structure contained within the metal. (Author)

Descriptors :   (*CRYSTAL DEFECTS, *SOLID SOLUTIONS), STRAIN(MECHANICS), DIFFUSION, IRON, CARBON, HEAT OF ACTIVATION, TRANSPORT PROPERTIES, STRESSES, TEMPERATURE

Subject Categories : Crystallography
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE