Mechanical anisotropy and grain interaction in recrystallized aluminum

Abstract

Axial compression tests up to 50 pct deformation were performed on rolled and fully recrystallized aluminum sheet stock (AA5754, AA5182, and AA6016) in the direction perpendicular to the sheet. Textures were measured using both X-rays and orientation imaging microscopy (OIM). In all three cases, a systematic in-plane anisotropy was observed, with more strain taking place in the transverse than in the rolling direction. Previous attempts to simulate this in-plane anisotropy for AA5754, starting from the X-ray initial textures and using a one-site polycrystal model, resulted in predictions of more deformation along the rolling than along the transverse direction. An analysis of the OIM textures indicates that there is a nonrandom spatial correlation of the recrystallization and retained rolling components. As a consequence, we implemented grain interaction and co-rotation in a viscoplastic self-consistent (VPSC) polycrystal model, in order to be able to account for orientation correlations. Such an approach allows us to describe the large-and small-angle misorientation distributions, as a function of deformation and to compare them with the available experimental evidence. Concerning the in-plane anisotropy, we conclude that it is very sensitive to details in the texture representation, rather than on grain interactions. Grain-interaction and co-rotation effects, however, have the effect of inducing less severe deformation textures, which is in better agreement with the experimental evidence.

Self‐Consistent Modeling of Texture Evolution in TWIP Steel During Uniaxial Tension

“…Grains were paired at random at the beginning of a simulation and made to corotate in order to improve strain compatibility at grain boundaries via the grain co-rotation Scheme. [23] This scheme allows grains with the same initial orientation but different neighboring grains to follow different reorientation paths during deformation. Consequently, the overall texture evolution is slowed down during the simulation.…”

Development of crystallographic texture during high rate deformation of rolled and hot-pressed beryllium

“…A co-rotation model can be used to account empirically for the latter effect on the texture evolution. [28] The measured deformation textures are not exactly reproduced by the calculated textures. Most notably, in both the TT and HP compression samples, the calculated basal pole figures exhibit a depression in basal pole density along the load direction and the maximum intensity distributed in a cone about the load direction.…”

Stabilization of NaZn(BH4)3via nanoconfinement in SBA-15 towards enhanced hydrogen release

“…Grains were paired at random at the beginning of a simulation and made to co-rotate to improve strain compatibility at grain boundaries by using the grain co-rotation scheme [29]. This scheme allows grains with the same initial orientation but different neighbouring grains to follow different reorientation paths during deformation.…”

“…It is also emphasised that we are only interested in the development of the texture and not in the macroscopic stress-strain response. Therefore, the exact values of the single crystal hardening parameters are not relevant [29].…”