Through-process texture modelling of aluminium alloys

Abstract

The complete through-process modelling of crystallographic texture evolution during aluminium sheet production is addressed. The texture determining processes deformation and recrystallization are analysed with respect to the underlying mechanisms. The advanced deformation texture model grain interaction (GIA) is coupled to a statistical analytical recrystallization texture model (StaRT). New concepts are described to model nucleation spectra for recrystallization with the GIA model and with a new model for the prediction of in grain orientation gradients. Orientation dependent recovery of the deformed structure is reflected based on substructure information extracted from the GIA model. A finite element (FE) model incorporating dislocation density based work hardening as well as texture serves as a process model to describe the macroscopic production parameters based on microstructural information. More detailed information on this integrative FE model can be found in a second paper presented at this symposium by Neumann et al. The excellent performance of the outlined through-process texture modelling concept is demonstrated in applications for two different aluminium sheet production lines—one laboratory and one industrial process—and displays for the first time the possibility of modelling texture evolution throughout various consecutive processing steps.

Development of the Multi-scale Analysis Model to Simulate Strain Localization Occurring During Material Processing

“…These mechanisms have been the subject of research performed for decades by scientists from all over the world [3,5,10,15,27,61,87,97,98,101,102,105]. Several complex theoretical and mathematical models describing slip and twinning in various metallic materials (steel [51], aluminum [20], magnesium [98] and titanium [118]) have been used in theoretical analyses supporting the experimental knowledge. However, some of the mechanisms are still not fully understood.…”

Dislocation density based modeling of work hardening in the context of integrative modeling of aluminum processing

“…4. Details on the texture calculation also for the subsequent annealing can be found elsewhere [13].…”

Relaxed grain cluster (RGC) homogenization scheme

“…There are two opposing aspects that need to be addressed in homogenization issues, namely, (i) to maximize the quality of the overall prediction by preserving all relevant information from lower scale mechanisms, yet (ii) to minimize the amount of computational effort. In the context of polycrystalline metals, various homogenization schemes have been proposed in the last few decades, ranging from the most simple assumptions (i.e., Taylor and Sachs models), semianalytical grain interaction-based models (see e.g., [1][2][3]), up to complex numerical techniques (see e.g., [4,5]). The present work is aimed at developing an efficient homogenization scheme, called the relaxed grain cluster (RGC) model.…”

“…The present work is aimed at developing an efficient homogenization scheme, called the relaxed grain cluster (RGC) model. This model is based on the generalization of the grain cluster concept (see e.g., [1,2]), which focussed on close interactions (in terms of deformations and stresses) between neighboring grains.…”