Textures of Cold-Rolled Polycrystalline Aluminium

Abstract

The variation of the integrated intensities and breadths of X-ray diffraction lines from polycrystalline high-purity aluminium in the processes of cold-rolling and annealing were observed by means of a counter-diffractometer by the Bragg-Brentano para-focusing system. The following results have been obtained: (1) Crystals having their (110) plane parallel to the rolling plane increase by rolling, but after having reached a maximum volume at a medium reduction, decrease on further reductions. (2) In the region near the surface of the specimen, crystals having their (111) plane parallel to the rolling plane decrease conspicuously by cold-rolling and only a few percent of them remain at about 70% and higher reductions. (3) Crystals having their (113) or (112) plane parallel to the rolling plane increase remarkably at high reductions. (4) On annealing at 100∼200°, the integrated breadth of each diffraction line was almost unchanged, but many small discrete diffraction spots could be observed by the usual photographic method. At this stage, the (100) and (113) orientations, developed by rolling, have a tendency to decrease, while the (110) orientation increases. (5) On annealing at temperatures higher than 300°, a cubically aligned texture developes very rapidly, while the (110), (112) and (113) orientations decrease at a smaller rates. During this process, the integrated breadths were observed to decrease.