Evolution of Dislocation Structure Parameters in Deformed Polycrystalline FCC Solid Solutions

Abstract

The paper presents the research results of the strain hardening and evolution of the dislocation structure parameters in Cu–Mn polycrystalline solid solutions having the average grain size of 20, 120 and 240 μm. The dislocation structure is studied on a transmission electron microscope. The density of scalar dislocations, geometrically necessary dislocations, statistically stored dislocations and misoriented deformation boundaries is measured. It is shown that these parameters change with deformation and depend on the grain size. It is found that the highest degree of accumulation of geometrically necessary dislocations occurs during the formation of the deformation boundaries.