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Effect of concurrent precipitation on recrystallization textures in commercial Al-Mn alloys

Journal of Southeast University(English Edition) 2015年第4期31卷 501-505页

作者：涂益友黄羚惠孙中岳周雪峰蒋建清东南大学材料科学与工程学院南京211189 南京信息工程大学南京210044

The effect of concurrent precipitation on recrystallization textures in AA 3003 aluminum alloys was investigated using X-ray diffraction and electron backscattering diffraction（EBSD） analyses. A weak recrystallization texture was observed in the AA 3003 alloy annealed at 783 K due to the high annealing temperature. Under the same conditions, extremely high P {011 } （ 111 ） recrystallization textures were detected in the AA 3003 alloy added with 0. 39% Sc. Based on the EBSD results, no intensely preferential orientation nucleation of recrystallization grains was observed in the early stage of recrystallizafion for both alloys. However, concurrent precipitation strongly retarded the growth of recrystallization grains, except for P nucleation sites, thereby conferring an apparent initial growth advantage for P nucleation sites compared with other nucleation sites. Therefore, a sharp P {011 } 〈 111 〉 texture appeared in concurrently precipitated AA 3003 alloys.

关键词： AA3003 alloy concurrent precipitation recrystaUization texture

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Evolution in microstructure and mechanical properties during back-annealing of AlMnFeSi alloy

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Transactions of Nonferrous Metals Society of China 2012年第8期22卷 1878-1883页

作者：王宁 Jarl Erik FLATφY 李彦军 Knut MARTHINSEN Department of Materials Science and Engineering Norwegian University of Science and TechnologyNO-7491TrondheimNorway SINTEF Materials and Chemistry NO-7465TrondheimNorway

An Al-Mn-Fe-Si model alloy was subjected to two homogenization treatments, to achieve materials with different levels of Mn in solid solution and dispersoid densities, followed by cold rolling and back-annealing. Characterization of homogenization and deformation structures with respect to the effect of different microchemistries and strains on the structures was performed. Time-temperature-transformation （TTT） diagram with respect to precipitation and recrystallisation as a basis for analysis of the degree of concurrent precipitation was established. The TTT-diagram shows a strong effect of Mn concentration in solid solution and dispersoid density on the softening behavior. Recrystallization which finishes without the effect of concurrent precipitation results in an even, fine and equiaxed grain structure. precipitation prior to or during recrystallization （concurrent） does retard the softening kinetics and leads to a coarse grain structure. However, the effect also depends on the duration of recrystallization and amount of precipitation. Recrystallization proceeding over a long time combined with a large amount of concurrent precipitation has a strong effect, otherwise the effect will be limited. Pre-existing fine and dense dispersoids （mean size 0.1 μm） before back-annealing do also lead to a coarse grain structure after recrystallization no matter whether additional concurrent precipitation occurs.

关键词： homogenization treatment dispersoid phase solid solution back-annealing recrystallization concurrent precipitation TTT-diagram

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