Plastic behavior of face-centered-cubic metals over a wide range of strain

摘要

The plastic behavior of four pure face-centered-cubic (fcc) metals (Al, Au, Cu and Ni) was studied at room temperature up to a strainvalue of ～8 achieved by severe plastic deformation. It is shown that at high strains the saturation flow stress and the total dislocationdensity can be scaled with the melting point, and the deformation process can be regarded as steady-state flow leading to a uniformdescription of the plastic behavior of these fcc metals at all temperatures. The results suggest that the plastic flow at room temperatureof fcc metals processed by severe deformation is primarily attributable to diffusion-controlled and thermally activated processes due tothe high concentration of deformation-induced vacancies.