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Microstructure evolution of laser rapidly solidified al-mn alloys

Progress in Natural Science:Materials International 2002年第9期 46-50页

作者： YANG Sen, HUANG Weidong, LIU Wenjin and ZHOU Yaohe(1. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China 2. Department of Materials Science and Engineering, Inner Mongolia Polytechnic University, Hohhot 010062, China 3. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China)

A series of laser surface remelting experiments of al-1.1, 3.2 and 5.6 wt % mn alloys has been conducted using a 5 kW CW CO2 laser, and the microstructures of samples have also been investigated. The experimental results show that no apparent eutectic growth appears in the whole growth rate range for al-3.2 wt % mn alloy under laser rapid solidification condition, and the microstructure grows in the form of α( al) cell/dendrite. With the increase of growth rate, the microstructures of al-5. 6wt% mn alloy change from al6mn dendrite to α(al) + al6mn eutectic, α(al) cellular/dendrite and segregation-free solid solution. The critical rates of al-1.1, 3.2 and 5.6 wt% mn alloys to attain absolute stability are 44.1, 134.6 and 230.1 mm/s respectively, and a reasonable agreement has been found between the experimental results and those calculated according to Mullins-Sekerka's theory.

关键词： laser rapid solidification al-mn alloys absolute stability.

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Tailoring the microstructure and mechanical properties of the final al-mn foils by different intermediate annealing process

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Journal of Materials Science & Technology 2017年第9期33卷 961-970页

作者： Li Huang Guangjie Huang Yunchang Xin Lingfei Cao Xiaodong Wu Zhihong Jia Qilei Li Qing Liu College of Materials Science and Engineering Chongqing University

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（;.35 μm） in the TSA-foils than those by discontinuous recrystallization in the SSA-foils（;4.7 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} after discontinuous recrystallization. Finally, a maximized elongation to fracture of;3.9%was achieved in the TSA-foil, much higher than that of the SSA-counterparts,;.3%. The relationships between the microstructure and mechanical properties were discussed.

关键词： al-mn alloys Foil Annealing Recrystallization mechanism Size effect Mechanical property

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