Abstract
The as-received hot band (2.54-mm thick) of a continuous cast (CC) AA 3004 Al alloy was cold rolled at reductions, ranging from 25 to 90 pct, and subsequently annealed at 510 °C for 4 hours. Some of these specimens had been annealed at 420 °C for 3 hours with a heating rate of 1 °C/min prior to cold rolling. It was found that the sample with the prior heat treatment exhibited a P orientation ({011}\( \left\langle {566} \right\rangle \)) of 28 pct in volume fraction, stronger than that (23 pct) in the sample without the prior heat treatment, after 90 pct cold rolling and final recrystallization. The transmission electron microscopy (TEM) observations revealed that the prior heat treatment generated very densely distributed Al6(Mn,Fe) precipitates, which could pin dislocations and grain boundaries in the alloy. The formation of stronger P texture in the sample with the prior heat treatment revealed that the P texture could also be developed due to dislocations pinned by the existing fine Al6(Mn,Fe) precipitates during recrystallization in the CC Al alloys that contained Mn.
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Acknowledgments
This research was sponsored by the National Science Foundation under Grant No. 0413724. The TEM work reported in this article was conducted as part of the Oak Ridge National Laboratory’s SHaRE User Facility, which is sponsored by the United States Department of Energy, Office of Energy Efficiency and Renewable Energy, Industrial Technologies Program, Industrial Materials for the Future and the Division of Materials Science and Engineering, under Contract No. DE-AC05-00OR22725 with U.T. Battelle, LLC. The authors also thank Aleris International, for provision of the alloy studied in this project, and Dr. E.A. Kenik, Oak Ridge National Laboratory, for his assistance with the TEM experiments in this project.
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Manuscript submitted November 9, 2008.
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Zeng, Q., Wen, X. & Zhai, T. Effect of Precipitates on the Development of P Orientation {011}\( \left\langle {566} \right\rangle \) in a Recrystallized Continuous Cast AA 3004 Aluminum Alloy after Cold Rolling. Metall Mater Trans A 40, 2488–2497 (2009). https://doi.org/10.1007/s11661-009-9942-x
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DOI: https://doi.org/10.1007/s11661-009-9942-x