Grain Boundary-Hardening due to Piled-up Dislocations

Abstract

The grain boundary in deformed bicrystals of α-brass has the hardening layer of 50∼100 microns in thickness. Evidences for the assumption that the hardening is attributable to the dislocations piled up against the grain boundary were provided by the fact that the amount of hardening could be reduced by the application of reversed stress, and also by the analysis of the hardness distribution which showed the amount of hardening to be approximately proportional to the density of piled-up dislocations.