Dislocation Etch Pits in Slightly Elongated Polycrystalline Alpha Brass

Abstract

The process of the early stage tensile deformation (≤σ_=0.2%) of polycrystalline α-brass (70-30), was studied using Jacquets etch pit technique. Observations of etch pit arrangements in the same grain at various stages of deformation shows that the order of generation of glide dislocations agrees well with the results obtained from analysis without taking into consideration the influence of surrounding grains, but the effect of constraint from neighboring grains appeared in configurations of pile-up dislocation rows blocked by obstacles such as grain boundaries and sessile dislocations. As the deformation proceeds, the number of blocked dislocations increases and the mean free paths of newly formed dislocations are decreased.