Tailoring the microstructure and mechanical properties of the final Al-Mn foils by different intermediate annealing process
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2017年第9期
论文作者：Li Huang Guangjie Huang Yunchang Xin Lingfei Cao Xiaodong Wu Zhihong Jia Qilei Li Qing Liu
文章页码：961 - 970
摘 要：In this work, two different intermediate annealing processes, single-step annealing（SSA, 530?C/15 h）and two-step annealing（TSA, 450?C/5 h + 530?C/15 h）, were used to tailor microstructure before coldrolling and annealing of the final twin-roll cast Al-Mn foils. The recrystallization behavior and mechanical properties during annealing of severely cold-rolled foils were systematically studied. Our results show that discontinuous recrystallization occurs in SSA-foils during annealing at 150–310?C, in contrast with continuous recrystallization in TSA-foils. The continuous recrystallization develops much finer grains（1.35 μm） in the TSA-foils than those by discontinuous recrystallization in the SSA-foils（14.7 μm）. The texture components in cold-rolled TSA-foils hardly change（retained rolling-textures） after continuous recrystallization, while those in the cold-rolled SSA-foils mainly transform into a strong cube component{001} <100> after discontinuous recrystallization. Finally, a maximized elongation to fracture of 23.9%was achieved in the TSA-foil, much higher than that of the SSA-counterparts, 8.3%. The relationships between the microstructure and mechanical properties were discussed.
Li Huang，Guangjie Huang，Yunchang Xin，Lingfei Cao，Xiaodong Wu，Zhihong Jia，Qilei Li，Qing Liu
College of Materials Science and Engineering,Chongqing University
摘 要：In this work, two different intermediate annealing processes, single-step annealing（SSA, 530?C/15 h）and two-step annealing（TSA, 450?C/5 h + 530?C/15 h）, were used to tailor microstructure before coldrolling and annealing of the final twin-roll cast Al-Mn foils. The recrystallization behavior and mechanical properties during annealing of severely cold-rolled foils were systematically studied. Our results show that discontinuous recrystallization occurs in SSA-foils during annealing at 150–310?C, in contrast with continuous recrystallization in TSA-foils. The continuous recrystallization develops much finer grains（1.35 μm） in the TSA-foils than those by discontinuous recrystallization in the SSA-foils（14.7 μm）. The texture components in cold-rolled TSA-foils hardly change（retained rolling-textures） after continuous recrystallization, while those in the cold-rolled SSA-foils mainly transform into a strong cube component{001} <100> after discontinuous recrystallization. Finally, a maximized elongation to fracture of 23.9%was achieved in the TSA-foil, much higher than that of the SSA-counterparts, 8.3%. The relationships between the microstructure and mechanical properties were discussed.
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