X-ray diffraction analysis of pure aluminum in the cyclic equal channel angular pressing

• Published in: Scripta materialia 2001-02, Vol.44 (2), p.331-336
• Main Authors: Chang, Joon-Yeon, Kim, Geung-Ho, Moon, In-Ge
• Format: Article
• Language: English
• Subjects: Aluminum; Applied sciences; Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization; Cold working, work hardening; annealing, quenching, tempering, recovery, and recrystallization; textures; Cross-disciplinary physics: materials science; rheology; Dislocation density; Equal channel angular pressing (ECAP); Exact sciences and technology; Materials science; Metals. Metallurgy; Physics; Treatment of materials and its effects on microstructure and properties; X-ray diffraction
• ISSN: 1359-6462; 1872-8456
• DOI: 10.1016/S1359-6462(00)00581-9

X-ray diffraction (XRD) analysis was performed on Al samples cyclic pressed through ECAP using route A. Some conclusions drawn from the monitoring of dislocation density, r.m.s microstrain and effective domain size are as follows. Repetitive Equal Channel Angular (ECA) pressings distort the symmetric profile of XRD peaks and to broaden the peak width, which is more obvious in the {111} than the {200} plane. The dislocation density increases substantially up to only 4 passes and then reaches a constant value even after 16 passes. The r.m.s microstrain showed the same behavior as the dislocation density except a small decrease was found at 4 and 8 passes. The effective domain size significantly decreased at earlier stage of pressings (4 passes) and then showed little change as the number of pressings increased. It is believed that in that route A, 4 passes are critical number of repetitive pressings to make fine subgrain size and further pressings may result in stable equiaxed subgrain by increasing the misfit angle.