Fundamental strengthening mechanisms and their contributions to flow stresses in alloys with a network dislocation substructure

Abstract

The paper presents the data of electron-microscopic studies of the dislocation substructure in polycrystalline Cu-Al and Cu-Mn alloys. Contributions of network and cellular-network dislocation substructures (DSS) are determined. The relative role of various mechanisms in formation of the resistance to deformation of the investigated alloys at different grain sizes is determined. The role of the stacking fault energy (SFE) is revealed. The average scalar dislocation density and its components are determined: statistically stored dislocations ρS and geometrically necessary dislocations ρG.