Evolution of Texture and Grain Size during Equal Channel Angular Extrusion of Pure Copper and 6012 Aluminum

Document Type: Research Paper

Authors

1 Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran

2 Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, Iran

Abstract

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 6 passes was carried out on a pure copper and a 6012 Al-Mg-Si alloy with BC route in ECAP dies with Φ=120 and Ψ=20 and diameter of 20and 10 millimeter respectively. Moreover, X-ray diffraction (XRD) system was utilized to investigate changes of the crystallite size and texture variations using for calculating texture parameters and comparing the X-ray diffraction patterns of annealed samples and Ecaped samples. Dominant texture of (111) in annealed aluminum altered to a mixture plane. Also, dominant texture of annealed copper of (111) and (200) shifted to another plane. The opposite of copper samples, changes in diameter and length of aluminum specimens had no effect on diffraction pattern of them. The microstructures were evaluated by OM. The results showed that grain size of annealed aluminum after six passes of ECAP decreased by 75%.

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