ORIENTATION AND MISORIENTATION CHARACTERISTICS OF ANNEALED, ROLLED AND RECRYSTALLIZED COPPER

The texture and microstructure of annealed, rolled and recrystallized copper (99.99%) were investigated using conventional X-ray diffraction and single-crystal electron backscattering diffraction (EBSP) in a sc anning electron microscope. From the EBSP data, misorientation distrib ution functions for next neighbor orientation relationships were deriv ed, which show that the undeformed (annealed) starting material and th e recrystallised sample have primary and secondary twin correlations, whereas in the deformed sample no preferred misorientations are observ ed. The microtexture of a single grain with twin lamellae in the defor med sample was analysed in detail using automated analysis of electron backscattering diffraction patterns. The twin relationship is transfo rmed continuously into a high angle grain boundary during deformation. Orientation gradients within one grain increase steadily up to 20 deg rees.