Evolution of microstructure texture for multilayered Al (1100)/Al (5083) composites by accumulative roll bonding process

Accumulative roll-bonding (ARB) process is an intense plastic deformation process that has been performed for a multilayered Al/Al composite from pure Aluminum (1100) sheets and Aluminum-Magnesium (5083) sheets to develop ultra-fine grains below 1 μm in diameter and to improve mechanical properties. The ARB process up to six cycles is performed at ambient temperature under unlubricated conditions. The ultra-fine grains surrounded by clear boundaries begin to appear at the third cycle, and the specimen after six cycles shows a microstructure covered with nano-grains with an average diameter of 100 nm. The hardness of the specimens ARBed by one, three and five cycles varies inhomogeneously in the thickness direction; having peak values near the surface and the center. This is due to the redundant shear strain and wire brushing. It has been seen that the textural evolution has no similarity with the simple shear texture; the components can be well represented by the ideal rolling texture components. Texture analysis revealed fiber textures have been discovered with continuous of the ARB process cupper. Brass, S and Rotated Cubic textures identify which their differences are in intensity of ARB process.

کلیدواژه ها:

Accumulative roll-bonding ، brass texture ، Fiber texture ، copper texture ، Cubic textures