Evolution of recrystallization texture from aluminum sheet cold rolled under unlubricated condition

Abstract

The texture of cold-rolled aluminum sheet has been known to vary through thickness due to inhomogeneous deformation, which can be caused by a characteristic deformation zone geometry and friction between materials and rolls during rolling. The copper texture is obtained in the center layer, which is plane strain compressed, while the shear texture is in the surface layer, which is approximated by major {001}͗110͘ and minor {111}͗112͘ and {111}͗110͘ components. The recrystallization texture of the surface layer is approximated by {225}͗10 5 2͘. The evolution of the recrystallization texture has been explained by the maximum energy release theory, in which the absolute maximum normal stress direction in the deformed state becomes parallel to the minimum elastic modulus direction of the recrystallized grains.

Heterogeneity of crystallographic texture in friction stir welds of aluminum

“…The retreating side contains a minor (111) component oriented toward the weld center and texture is consistent with that reported for the recrystallized structure near the surface of a rolled Al sheet. [29] Since the 20 deg up toward the tool shoulder in mirror fashion to that seen on the advancing edge.…”

“…However, recrystallization of shear textures in Al alloys typically results in similar textures to those observed after deformation. [29] Since deformation in FSW is largely a shearing process, this justifies, to some extent, the discussion of local deformation states necessary to produce the resultant textures. In addition, dynamic recrystallization alters the texture slightly from that expected from the deformed state but retains the general (e) ( f ) character of the deformation texture.…”

Through-thickness texture gradient in an annealed Al-Mg alloy sheet

“…Cold rolling, the major fabrication step in producing sheet materials, has been shown to result in an inhomogeneous texture through the thickness of sheet metals. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] This textural inhomogeneity typically manifests itself in the formation of relatively strong shear texture components (Table I) on the surface layer, with these components either weakening severely or lacking near the centerline of the sheet. [1][2][3][4][5] While past research has focused primarily on the nonuniform texture of these types of processed sheets, little has been done to investigate sheets produced without the shear-related components at the surface, which can be accomplished through carefully controlled rolling techniques during fabrication.…”

“…[1][2][3][4][5] While past research has focused primarily on the nonuniform texture of these types of processed sheets, little has been done to investigate sheets produced without the shear-related components at the surface, which can be accomplished through carefully controlled rolling techniques during fabrication. In addition, studies characterizing the developed through-thickness texture of a rolled and subsequently annealed sheet were limited, [12] regardless of the formation of shear textures. Thus, this research was initiated to measure the through-thickness texture developed in both a cold-rolled Al-Mg alloy produced without shear texture components at the surface and this same sheet after annealing.…”

The Evolution of Shear Deformation Texture and Grain Refinement in Asymmetrically Rolled Aluminum Sheets

“…Unlike conventional or symmetric rolling, which can introduce shear deformation only in the surface region of sheet, asymmetric rolling gives rise to the shear strain throughout the thickness. Recent studies have reported that the shear deformation can develop shear deformation textures in aluminum alloy sheets for the purpose of the improvement of their plastic strain ratios and in turn deep drawabilities [1][2][3][4][5][6][7][8][9][10][11][12][13]. The ideal components of shear deformation textures of fcc metals are {001}<110>, {111}<110> and {111}<112>, among which ND//{111} texture is the most favorable components for the drawability of sheets [2,3,14].…”