Inhomogeneous Deformation of Grains and Roughening of Free Surface of Polycrystalline Copper in Compressive Plastic Deformation

Abstract

Inhomogeneous deformation at the free surface of a copper specimen in compressive plastic deformation is studied. The inhomogeneous deformation of grains in the plane of specimen surface is observed under scanning electron microscope, while the inhomogeneous deformation perpendicular to the surface is studied by measuring the surface roughness. It was found that the standard deviation of the measured strain for various grains as well as that of the measured surface roughness increase with the applied strain. Discussion is made on the relation between the variation of strain for various grains and that of the surface roughness.