Development of through-thickness texture gradient and persistence of shear-type textures during annealing of commercial purity aluminium sheet processed by accumulative roll-bonding

Microstructural peculiarities and textural characteristics of Ni–W sheet alloy after accumulative roll-bonding and annealing

“…The variation of the texture along the thickness of the ARB processed sheets has been already reported in the literature [7,13]. The ARB processed alloys usually developed a texture gradient manifested by a typical rolling texture (Copper, Brass and S components) near the mid-thickness layer and shear type texture (C and {111}//ND components) near the surface layers [7,13,18]. This behavior was attributed to the redundant shear strain induced by high friction between the material and the roll during the ARB processing [7,13].…”

“…This behavior was attributed to the redundant shear strain induced by high friction between the material and the roll during the ARB processing [7,13]. As it is well established, the annealing of rolling texture leads to the formation of {001}〈100〉 Cube texture [7,18]. This evolution was thought to be caused by a mechanism of preferential growth of Cube grains that may engulf the deformed ones during the primary recrystallization process.…”

“…This evolution was thought to be caused by a mechanism of preferential growth of Cube grains that may engulf the deformed ones during the primary recrystallization process. Meanwhile, the shear texture at the surface layer seems to be retained after annealing treatment in ARB processed pure Al [18] and in ARB processed pure Ni [17]. In fact, the shear texture components are retained regardless the deformation processing or the type of recrystallization treatments [18,31].…”

“…In practice, one ARB cycle consists of rolling two sheets together (50% thickness reduction), cutting, wire brushing of the surface and stacking them to achieve the initial thickness [12]. Such a complex plastic deformation (combination of plane strain deformation and shear deformation) in each ARB cycle introduces significant through-thickness heterogeneities in the microstructure and texture [7,[13][14][15][16][17][18]. Usually, the mid-thickness of the ARB processed material is characterized by elongated grains along the rolling direction and exhibits a typical rolling texture, while equiaxed grains with typical shear texture are observed in the external layers [7,10,14,18].…”

“…Annealing characteristics after ARB processing have been reported for many face-centered cubic (FCC) materials with high to low stacking fault energy [8,11,[18][19][20]. A clear dependency of the recrystallization process on the sample scale heterogeneities was found.…”