Effect of Asymmetrical Accumulative Roll-Bonding and Heat Treatment on the Formation of Ultra-Fine Twin Copper

摘要

The ultrafine copper with twins was prepared by asymmetrical accumulative roll-bonding (AARB) and heat treatment. The characteristic of grain refinement and the texture transformation during recrystallization were investigated. The results show that the crossover areas, which were formed by the shear stress during AARB, were zones of compression deformation and shearing deformation when the deformation of copper occurred in these areas. The average grains size was reduced to lum from original average size of 30~ 50μm due to processing by AARB. The strong elastic stress accumulated by shearing texture is responsible for oriental growing of a great number of grains during recrystallization. The shearing texture {001}<110> rotates 54.7°and transforms into annealing texture {111}<211> i.e. twins microstructurc.