Evolution of Microstructure and Texture During Deformation and Recrystallization of Heavily Rolled Cu-Cu Multilayer
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A Cu-Cu multilayer processed by accumulative roll bonding was deformed to large strains and further annealed. The texture of the deformed Cu-Cu multilayer differs from the conventional fcc rolling textures in terms of higher fractions of Bs and RD-rotated cube components, compared with the volume fraction of Cu component. The elongated grain shape significantly affects the deformation characteristics. Characteristic microstructural features of both continuous dynamic recrystallization and discontinuous dynamic recrystallization were observed in the microtexture measurements. X-ray texture measurements of annealing of heavily deformed multilayer demonstrate constrained recrystallization and resulted in a bimodal grain size distribution in the annealed material at higher strains. The presence of cube- and BR-oriented grains in the deformed material confirms the oriented nucleation as the major influence on texture change during recrystallization. Persistence of cube component throughout the deformation is attributed to dynamic recrystallization. Evolution of RD-rotated cube is attributed to the deformation of cube components that evolve from dynamic recrystallization. The relaxation of strain components leads to Bs at larger strains. Further, the Bs component is found to recover rather than recrystallize during deformation. The presence of predominantly Cu and Bs orientations surrounding the interface layer suggests constrained annealing behavior.
KeywordsGrain Size Distribution Texture Component Orientation Distribution Function Accumulative Roll Bonding Coincidence Site Lattice
One of the authors (SS) acknowledges the fellowship awarded by Indo-US Science and Technology Forum (IUSSTF) during which current study was initiated. Most of the experiments were carried out at the Institute X-ray facility and Advanced facility for microscopy and microanalysis (AFMM) at IISc, Bangalore. A part of the current study was supported through a grant from the Department of Science and Technology, Government of India. ADR acknowledges the support provided in part by the Center for Materials at the Irradiation and Mechanical Extremes, an Energy Frontier Research Center funded by the U.S. Department of Energy, the Office of Science, and the Office of Basic Energy Sciences, in addition to the support of the Department of Materials Engineering at IISc through the Brahm Prakash Chair Professorship.
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