Separation and characterization of stress levels and texture in metal sheet and plate. II. Rolled copper sheet experiment

The elastic shear moduli determined by EMAT (electromagnetic acoustical transducers) techniques was compared to X-ray pole figure measurements for three lots of rolled Cu sheet. All moduli (C' sub 44 , C' sub 55 , C' sub 66 ) decreased with rolling reduction to > --10% for a 90% rolling reduction and the difference between C sub 44 and C sub 55 increased with developing in-plane anisotropy, as predicted. Pole figures of (111) and (200) planes revealed various initial textures for the starting annealed plates, and (111) pole rotation toward a single well-defined preferred orientation at large rolling reductions. Stress relief annealing of a heavily cold rolled plate produced no significant changes in elastic moduli while hardness decreased, thus indicating that textural changes were responsible for the observed moduli changes. 9 ref.--AA