Abstract
Using cold rolling, we plastically deform AA6061 sheets at room temperature and investigate the variations of the microstructures, textures and local deformation of the cold-rolled AA6061 sheets as functions of thickness reduction (Δt/t0, t0 and t are the thicknesses of the AA6061 sheet before and after the cold rolling, respectively). The volume fraction of total deformation texture is relatively independent of the thickness reduction for Δt/t0 ≤ 30%, and becomes an approximately linearly increasing function of the thickness reduction for Δt/t0 > 30%. Increasing the thickness reduction causes the increase of the Vickers hardness of the cross-section of the cold-rolled sheets, which exhibits a similar increase trend to the volume fraction of total deformation texture for Δt/t0 > 30%. A simple relation between the Vickers hardness and the thickness reduction is established and is used to curve-fit the experimental results.
Highlights
The non-equiaxed shape of the grains in the as-annealed specimen suggests that the AA6061 Al sheets received from Alfa Aesar had experienced plastic deformation, and there exist residual stresses in the AA6061 Al sheets
AA6xxx Al alloys have potential as structural materials in the applications of automobile and aerospace industries
It is of great importance to investigate the effect of plastic deformation on the microstructure and mechanical behavior of AA6xxx Al alloys for analyzing the structural integrity of the mechanical structures made from AA6xxx Al alloys
Summary
The demand for producing light vehicles with reduced fuel consumption has led to an increasing interest in the applications of AA6xxx aluminum (Al) alloy instead of steel for automotive industry due to reasonable strength, good formability, and corrosion resistance of AA6xxx Al alloy [1,2,3,4,5].the ridging and roping phenomena, which have been widely observed in some AA6xxx Al alloy after being stretched along the transverse direction (TD) [6,7,8], has imposed a great challenge to the applications of AA6xxx Al alloy, since surface appearance is one of the important considerations for the applications of sheet metals in the automobile industry.It is known that the texture, a spatial distribution of specific crystallographic orientations, plays an important role in the appearance of ridging or roping in sheet metals [8,9,10], and rolling of Al alloys can introduce mechanical anisotropy of Al alloy sheets through the changes of crystallographic texture.Using cold rolling and accumulative roll bonding (ARB) at room temperature, Kashihara et al [11]investigated the ARB-induced variations of microstructure and textures in aluminum single crystals with {112} crystallographic orientation, and found that the shear deformation caused the development of the (001) [110] orientation in the lower surface layer. The ridging and roping phenomena, which have been widely observed in some AA6xxx Al alloy after being stretched along the transverse direction (TD) [6,7,8], has imposed a great challenge to the applications of AA6xxx Al alloy, since surface appearance is one of the important considerations for the applications of sheet metals in the automobile industry. It is known that the texture, a spatial distribution of specific crystallographic orientations, plays an important role in the appearance of ridging or roping in sheet metals [8,9,10], and rolling of Al alloys can introduce mechanical anisotropy of Al alloy sheets through the changes of crystallographic texture. Shabadi et al [13] studied the effect
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