Modeling the Effect of Heating Rate on Recrystallization Texture Evolution in AA3103

Abstract

Aluminum is the material of choice for light-weight applications. For high strength applications particle containing alloys are used. Such alloys are prone to various microstructural effects during deformation and subsequent annealing. A change of the processing conditions, in particular of the heat treatment, can cause significant changes of microstructure and texture, which impact the final properties of the product. The current computational study addressed the influence of different heating rates on recrystallization texture evolution. At elevated temperatures aluminum alloys are softened by two main processes, recrystallization and recovery.Recovery does not lead to significant changes in the texture, in contrast to recrystallization. Recrystallization during annealing with different heating rates is affected by both recovery, which reduces the driving force for recrystallization, and phase transformations (precipitation, dissolution) which changes the nucleation and growth rate of recrystallizing grains. Three different scenarios can occur. (i) Recrystallization is completed before any significant precipitation sets in; in this case, recrystallization proceeds completely unaffected by precipitation. (ii) Precipitation occurs before the onset of recrystallization, then the substructure may be pinned by the dispersoids, and only recovery can take place (recrystallization in situ). (iii) Recrystallization and precipitation occur concurrently. This case is considered in the present paper. The three different scenarios can be observed in AA3103 by choosing different heating rates as shown in this study.

Cellular Automaton‐Based Modeling of Recrystallization Texture Considering Instability Criterion and Nonuniform Boundary Mobility in AA1100 Aluminum Alloy

“…[33] However, investigations on textures are few. [25,31,[34][35][36] A constant threshold of critical energy has been proposed in terms of dislocation density to modify the nucleation rate together with uniform boundary mobility. [26,29,30,37] According to the mechanical instability criterion (MIC), a local imbalance of the driving force is required for nucleation.…”

Distinct Recrystallization Pathways in a Cold-Rolled Al-2%Mg Alloy Evidenced by In-Situ Neutron Diffraction

“…The impurities or precipitates (either pre-existing or nucleated during heating) can also change the RCX kinetics [17], but it is not clear if the nucleation is delayed or the GB mobility is reduced. It was also shown [18,19] that a higher heating rate applied would suppress the recovery step, and is expected to influence the RCX kinetics and the final texture.The most common DF texture present in cold-rolled Al-alloys is the β-fiber, containing at least three ideal components usually indexed as: Copper, Cu {112}<111>, Brass, Bs {011}<211>, and S-component {123}<634>. However, annealing of a cold-rolled alloy that has a medium to high stacking fault energy, such as the present Al-alloy, would result in a recrystallization texture whose main component is a cube texture, {100}<001> [20][21][22][23][24][25].…”

“…The impurities or precipitates (either pre-existing or nucleated during heating) can also change the RCX kinetics [17], but it is not clear if the nucleation is delayed or the GB mobility is reduced. It was also shown [18,19] that a higher heating rate applied would suppress the recovery step, and is expected to influence the RCX kinetics and the final texture.…”