Microstructure and texture evolution of Cu–Cr–Co–Ti alloys during the two-stage cryorolling

This study entailed an investigation of the mechanical properties, microstructural and texture orientation evolutions of Cu–Cr–Co–Ti alloys prepared via two-stage cryorolling and intermediate aging treatment. To this end, X-ray diffraction and electron backscatter diffraction were employed. The results indicate that the two-stage cryorolling and intermediate aging treatments led to the development of profuse twin bundles and significantly enhanced the mechanical properties. The initial cryorolling led to coplanar slip and developed a strong Y ({111} <112>) orientation, accelerating the formation of Goss ({011} <100>) orientation and a Brass-type texture. The intermediate aging treatment relieved the restriction on dislocation slip and reoriented the grains toward the Copper ({112} <111>) and Z ({111} <110>) orientations. The Z orientation, with a relatively high volume fraction, dominated the macrotexture. Secondary cryorolling intensified twinning and shear banding, transforming the Copper-type shear bands into Brass-type shear bands with rhomboidal prism morphology. The areas inside the Brass-type shear bands exhibited a Y orientation, and the areas outside the shear bands exhibited a stable Brass-type texture. The evident decrease in the weighted Schmid factors demonstrated that the two-stage cryorolling and intermediate aging treatment can modify the texture evolution and aid the design of high-performance Cu alloys.