Texture and Microstrucutre of Cu and CuZn37 Brass under Shearing in a Planar Shear Test

Abstract

The shearing in the plane of a sheet and up to the point of final rupture was performed by means of shear apparatus on samples of copper and CuZn37 brass preliminary cold rolled to 75% reduction of area Optical examination of strain markings in Cu samples has revealed the formation of regular shear zones; on the contrary, non-regular and stepped shear zones were observed in the case of CuZn37 brass. Crystallographic textures determined by X-ray pole figure method have revealed increasing dispersion of the crystallite orientation for both examined cases; the number of crystallites rotating around the direction of shearing increases. Microstructural observation of sheared samples of copper has shown the formation of cellular structure of dislocation elongated in the shear direction; in the case of brass we note the shear banding on the background of twin + matrix sets.