Experimental and finite element analyses of plastic deformation in the compressive stage of copper in high-pressure torsion

Abstract

Plastic deformation behavior, hardness and microstructure distribution of copper disks in the compressive stage of high pressure torsion were investigated using experimental and simulation approaches. There exists a hardness inhomogeneity on the compressed disks, showing higher hardness in edge, lower hardness in center and considerably uniform hardness in radial medium of disks. Simulation results indicate that the disks show inhomogeneity development and distribution of strain and stress during the deformation. The characteristics of microstructure and grain deformation even following the appearance of hardness distribution are determined by the strain inhomogeneity, which indicates that the simulation results agree very well with the experimental. Further results present that friction between the disk and anvil plays a very important role in the deformation process of the compressive stage.