Materials Dependence of Deformation Texture Development in Various Deformation Modes

摘要

Attempts to understand the development of deformation textures have long been hampered by the following dichotomy: in theory, one expects orientation changes to be governed entirely by the geometry of deformation and thus to be the same for all materials of the same lattice structure and the same deformation modes; yet in experiments, one observes differences between different materials of the same lattice structure. The current work represents an effort to address this problem anew. Four fcc single-phase materials (aluminium, copper, silver, and 70:30 brass) were deformed along three strain-paths (wire-drawing, compression, and torsion), with complete texture determinations before deformation and after strains of roughly 1.0 and 2.0. In parallel, 800 randomly oriented but weighted grains were subjected to simulation of these same tests by the Los Alamos polycrystal plasticity (LApp) code, taking account of the initial textures. An ancillary question which could be addressed in this way is how long initial textures can be remembered by the material; the answer depends on the circumstances and is not always small strains. 8 refs., 3 figs., 1 tab. (ERA citation 13:018577)