Plastic Rotations in Polycrystalline Aluminium Foils
E. Yu. Badiyan, A. G. Tonkopryad, O. V. Shekhovtsov, R. V. Shurinov
V.N. Karazin Kharkiv National University, 4 Svobody Sqr., 61022 Kharkiv, Ukraine
Received: 02.07.2014; final version - 23.04.2015. Download: PDF
The processes of lattice reorientation developing on a macroscopic level during the plastic deformation of polycrystalline aluminium foils containing only the through grain boundaries are studied experimentally. The variety of rotational structure in shape, size, method and nature of the origination and development, which appears during the plastic deformation, is detected using original optical technique for the study of orientation inhomogeneity of the specimen surface. Broken reorientation bands with obtuse-angular or wedge-shaped tops, through bands, collective reorientation bands, and secondary rotations, which appear within the body of reorientation bands arisen earlier, are observed. As shown, the crystallographic orientation of the secondary rotations promotes development of sliding therein. Reorientation bands with obtuse-angular or wedge-shaped tops arise during plastic deformation like deformation twins. The arising of collective and through reorientation bands is a multistage process. All macroscopic reorientation bands appear near the grain boundaries and develop into the body of one of them. Reorientation bands arising within the bounds of one grain have identical crystallographic orientations and form the boundaries of deformational origin with the same disorientation with grain body. The misorientation angle distribution and the reciprocal density distribution for the coincident nodes are obtained. The spectrum of boundaries of deformational origin contains small-angular ($\cong$ 10%) and large-angular boundaries ($\cong$ 90%). Special boundaries and close to special ones are about 85% of the boundaries of deformational origin.
Key words: polycrystalline Aluminium, plastic deformation, reorientation bands, boundaries of deformational origin.
PACS: 61.72.Ff, 61.72.Lk, 61.72.Mm, 61.72.Nn, 62.20.fq, 68.35.Gy, 81.40.Lm
Citation: E. Yu. Badiyan, A. G. Tonkopryad, O. V. Shekhovtsov, and R. V. Shurinov, Plastic Rotations in Polycrystalline Aluminium Foils, Metallofiz. Noveishie Tekhnol., 37, No. 7: 951—960 (2015) (in Russian)