Texture Modeling of Accumulative Roll‐Bonding Processed Aluminum Single Crystal {1 2 3}<6 3 4> by Crystal Plasticity FE

Abstract

Texture modeling of accumulative roll‐bonding (ARB) is challenging due to the involved cutting, stacking, and roll‐bonding. In the present study, the crystal plasticity finite element model is used to study the texture evolution in an ARB processed aluminum single crystal. The predictions, after being validated by the experimental observations, are analyzed, and an inhomogeneous through‐thickness deformation, in terms of slip system activation, crystal rotation, and shear strain, is revealed. It is found that the cutting‐stacking causes shear strain reversal and crystal rotation reversal. The dynamic balance between the formed and destroyed (4 4 11)[11 11 ] and (0 0 1)[1 1 0] makes them stable in area fraction. Besides, another modeling skill, Submodel, is used to improve the texture prediction by increasing the mesh resolution in smaller regions, and microbands associated with the primarily activated slip systems are predicted in the Submodel.

A Combined Experiment and Crystal Plasticity FEM Study of Microstructure and Texture in Aluminium Processed by Reverse and Unidirectional Accumulative Roll-Bonding

“…In contrast, the increased TD-axis in 2-RevARB means that the crystal orientations that had reached relatively stable positions after 1-ARB became unstable during 2-RevARB. Texture evolution is a pronounced function of the starting texture and imposed deformation [3]. The texture evolution and plastic deformation are coupled during material processing, and this coupling is realized in the CPFEM model.…”

“…The low shear strain resulted in rolling texture and almost uniform through-thickness microstructure, since the rolls were newly polished. Texture evolution is a pronounced function of the starting texture and imposed deformation [3]. The texture evolution and plastic deformation are coupled during material processing, and this coupling is realized in the CPFEM model.…”

“…The hardening model and material parameters are described in Appendix B. This CPFEM model and the set of material parameters have been used in prior research to investigate texture evolution after different rolling processes [3,18], and accurate predictions have been obtained. Figure 2a shows an inverse pole figure (IPF) and high angle grain boundaries (HAGBs) EBSD map after 1-ARB.…”

“…Multi-cycle ARB results in a complicated distribution of through-thickness shear strain. The evolution of microstructure and texture in ARB is associated with the imposed shear strain [2,3]. However, how the strain path change influences the transition of microstructure and texture during rolling has not been well studied.…”

“…In CPFEM, the CP constitutive law is incorporated into the finite element method (FEM) framework, and the stress equilibrium and strain compatibility in each time increment are reached by basic mechanics principles for all elements. CPFEM simulations in two prior studies [3,10] captured the reversal of crystal rotation during ARB. They suggested that the reversal was due to the cutting and stacking of the material, and the starting materials used in both reports were single crystals.…”