Accession Number : AD0664831

Title :   WORK HARDENING OF PLASTICALLY NON-HOMOGENEOUS CRYSTALS.

Descriptive Note : Interim technical rept.,

Corporate Author : HARVARD UNIV CAMBRIDGE MASS DIV OF ENGINEERING AND APPLIED PHYSICS

Personal Author(s) : Ashby,M. F.

Report Date : JAN 1968

Pagination or Media Count : 57

Abstract : When a non-homogeneous crystal (a crystal which contains hard inclusions of a second phase, for example) deforms plastically, dislocations whose function is to ensure compatible deformation of the parts of the crystal accumulate in it. Unlike dislocations in homogeneous crystals, the density of these 'compatibility' or 'geometrically necessary' dislocations increases in direct proportion to the strain. These extra dislocations lead to extra work hardening in the non-homogeneous crystals. Although this is not the only way in which inclusions, for example, can stimulate work hardening, experiments suggest that it is the most important one. (Author)

Descriptors :   (*CRYSTALS, HARDENING), DEFECTS(MATERIALS), CREEP, DEFORMATION, DISLOCATIONS, CONTINUUM MECHANICS, THEORY

Subject Categories : Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE