evolution of texture and grain size during equal channel angular extrusion of pure copper and 6012 aluminum

among different spd techniques, equal channel angular pressing has attracted the most attentions,because of applying large strain to solid bulk materials. in this research, ecap process up to 6passes was carried out on a pure copper and a 6012 al-mg-si alloy with bc route in ecap dieswith φ=120 and ψ=20 and diameter of 20and 10 millimeter respectively. moreover, x-raydiffraction (xrd) system was utilized to investigate changes of the crystallite size and texturevariations using for calculating texture parameters and comparing the x-ray diffraction patterns ofannealed samples and ecaped samples. dominant texture of (111) in annealed aluminum altered toa mixture plane. also, dominant texture of annealed copper of (111) and (200) shifted to anotherplane. the opposite of copper samples, changes in diameter and length of aluminum specimens hadno effect on diffraction pattern of them. the microstructures were evaluated by om. the resultsshowed that grain size of annealed aluminum after six passes of ecap decreased by 75%.