Viscoplastic Self-consistent Modeling of the Through-Thickness Texture of a Hot-Rolled Al-Mg-Si Plate
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INTRODUCTION
ONE technological challenge in the production of rolled plates and sheets is to achieve microstructures or mechanical properties which are tailor-made for customer needs. In many cases, these requirements are related to the crystallographic texture. Tooling plates, which are used for machined parts in various industrial applications, require a homogeneous crystallographic texture across the plate thickness to reduce the eigenstress. Automotive body parts made from cold-rolled sheets require a balanced texture to minimize the plastic anisotropy. Anodized sheets for consumer electronics and design applications require a homogeneous crystallographic texture at the surface to achieve the desired optical appearance. Consequently, texture engineering is an increasingly important field in the aluminum rolling industry.[1] The main characteristics of texture evolution and the principal texture components (cf. Table I) of rolled aluminum alloys have already been studied decades ago.[2] Plane-strain cold rolling promotes the
G. FALKINGER and P. SIMON are with the AMAG rolling GmbH, Lamprechtshausenerstrasse 61, 5182 Ranshofen, Austria. Contact e-mail: [email protected] S. MITSCHE is with the TU Graz, Institute of Electron Microscopy and Nanoanalysis, Steyrergasse 17/III, 8010 Graz, Austria. Manuscript submitted September 23, 2019.
METALLURGICAL AND MATERIALS TRANSACTIONS A
well-known rolling components: brass, copper, and S. The presence of additional shear strain, e.g., due to increased friction or in thick plates, strengthens the rotated cube, also known as the shear component, at the expense of the rolling components.[3–6] Annealed plates and sheets are often dominated by the cube component because the activation and growth of cube nuclei during recrystallization is strongly favored. The recrystallization advantage of the cube component originates from cube transition bands, which serve as efficient nucleation sites.[7–10] While at room temperature dislocation glide in aluminum alloys is mainly restricted to the octahedral slip system f111gh011i, additional non-octahedral slip systems become available at elevated temperatures above 400 °C.[11–15] As a result, in comparison with cold rolling, hot rolling strengthens the brass component at the expense of the copper component.[16–18] Additionally the cube component, which is unstable at room temperature, is stabilized by the activation of non-octahedral slip. The stability of the cube component increases at high temperatures and low strain rates.[19,20] The stability of the goss component has been shown to follow the same dependencies.[21] Stable cube and goss components were also observed in the industrial hot rolling of various commercial alloys.[22,23] Similar to purely octahedral slip, shear loading strengthens the rotated cube component in the case of non-octahedral slip.[24] Consequently, the rotated cube component has been found in hot-rolled aluminum alloy plates.[25]
Table 1.
Texture Components in Hot Rolling of Aluminum Alloys
Component Cub
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