• Theissing, Moritz
• Falkinger, Georg
• Mitsche, Stefan

Abstract

In aluminum alloy sheets, the final texture has a major influence on, for example, formability<br/>or the so-called roping effect. Heat treatments carried out after cold rolling usually lead<br/>to the formation of new recrystallization textures. In order to better understand the formation<br/>of this texture, heating investigastions with different heating rates up to a temperature<br/>of 450◦C were carried out on cold-rolled sheets Al alloys. The resulting recrystallization<br/>texture was determined using in situ EBSD. A Zeiss Ultra55 scanning electron microscope<br/>equipped with a Kammrath&amp;Weiss heating stage, a Thorlabs scientific camera and the Ametek<br/>OIM software were used for this purpose. With regard to nucleation, it was found for<br/>all texture components that only very few texture areas already present in the rolled structure<br/>are actually possible as nuclei for the recrystallization texture. However, it was noticed<br/>that the newly forming grains (with or without texture) at the beginning of recrystallization<br/>usually served as a kind of nucleation point, from which the grains then continued to grow<br/>in their respective orientations. This behavior was particularly noticeable with the cube<br/>component. In addition, it was found that the grain growth of the cube component appears<br/>to be greatest in relation to the other texture components during the first recrystallization<br/>phase. An influence of the heating rate on the recrystallization process was also found. On<br/>the one hand, recrystallization started earlier with a lower heating rate, on the other hand,<br/>the previously described effect of the growth advantage of the cube component compared to<br/>the other orientations seemed to decrease with a higher heating rate.

Topics

• grain
• phase
• aluminium
• texture
• electron backscatter diffraction
• cold rolling
• recrystallization
• grain growth