Roughening of Contact Surface During Plane Strain Compressive Plastic Deformation of Polycrystalline Copper

Abstract

Changes in surface roughness and three-dimensional microscopic shapes of contact surface of polycrystalline copper during plane strain compressive plastic deformation are studied. The roughening of contact surface is measured with a stylus instrument. The microscopic change in surface shape is also observed with a scanning electron microscope. The roughness of contact surface measured in the free direction is larger than that measured in the constrained direction for the specimen having transverse contact surface. Meanwhile, the roughness of contact surface measured in the loading direction of the specimen having longitudinal contact surface is a little larger than that measured in the free direction. From the observation by a scanning electron microscope, it is seen that the mountains and the valleys which appear on the free surface are sharp, while those on the contact surface are relatively rounded.