Abnormal Grain Growth on the Surface of Cold-Rolled AA1235 Aluminum Plate during the Annealing Process

Abstract:

AA1235 aluminum alloys were twin roll cast into a 7.0 mm-thick billet and further rolled into a plate with 70% reduction, followed by annealing at 500 C for 8 h. Abnormal grains were found to be formed on the plate bottom surface. SEM, EBSD, and micro X-ray diffraction were used to analyze the mechanism underlying the abnormal growth of these grains. Results showed that the {100} <001> texture was formed in the surrounding normal grains adjacent to the abnormal grain. The orientation angle between the abnormal grain and its adjacent normal grains was 45°. The {100} <001> texture formed during rolling and annealing accelerated abnormal grain growth. The partially dissolved Fe precipitates were heterogeneously distributed in the plate bottom heterogeneously, which also mainly explained abnormal grain growth.

• Periodical: Materials Science Forum (Volume 898)
• Pages: 1123-1133
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.898.1123
• Online since: June 2017
• Authors: Y.Z. Zhu*, Xiao Hui Li, J.C. Li, Wei Long Fan, Cheng Wei Xia, Ran Liu
• Keywords: Abnormal Grain Growth, Aluminum, Annealing, Cold Rolling

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