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

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)

Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1961
Accession Number
AD0267518

Entities

People

  • Jens Lothe

Tags

DTIC Thesaurus Topics

  • Atmospheres
  • Dislocations
  • Impurities
  • Mechanical Properties

Fields of Study

  • Physics

Readers

  • Economics
  • Materials Science and Engineering.