| Evolution of grain structure in AA2195 A1-Li alloy plate during recrystallization |
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| 引用本文： | 杜予晅 张新明 叶凌英 刘胜胆. Evolution of grain structure in AA2195 A1-Li alloy plate during recrystallization[J]. 中国有色金属学会会刊, 2006, 16(2): 321-326. DOI: 10.1016/S1003-6326(06)60055-1 |
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| 作者姓名： | 杜予晅 张新明 叶凌英 刘胜胆 |
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| 作者单位： | School of Materials Science and Engineering, Central South University, Changsha 410083, China |
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| 基金项目： | Project （2004053304） supported by the Doctral Program Foundation of Education Ministry of China; Projects（50231030, 50301016） supported by the National Natural Science Foundation of China. |
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| 摘 要： | The evolution of the grain structures in AA2195 Al-Li alloy plate warm-rolled by 80% reduction during recrystallization annealing at 500℃ was investigated by electron backscatter diffraction, scanning electron microscopy and transmission electron microscopy. It is found that the elongated grain structures are caused by the lamellar distribution of recrystaUization nucleation sites, being lack of large second phase particles （〉 1μm）, and dispersive coherent particles （such as δ′ and β′concentrated in planar bands. The recrystallization process may be separated into three stages： firstly, recrystallization nucleation occurs heterogeneously, and the nuclei are concentrated in some planar zones parallel to rolling plane. Secondly, the grain boundaries interacted with small particles concentrate in planar bands, which is able to result in the elongated grain structures. The rate of the grain growth is controlled by the dissolution of these small particles. Thirdly, after most of small particles are dissolved, their hindrance to migration of the grain boundaries fades away, and the unrecrystallized zones are consumed by adjacent recrystallized grains. The migration of high angle grain boundaries along normal direction leads a gradual transformation from the elongated grains to the nearly equiaxed, which is driven by the tension of the grain boundaries.
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| 关 键 词： | Al-Li合金 铝合金 晶体结构 再结晶 等轴晶 |
| 收稿时间： | 2005-06-07 |
| 修稿时间： | 2005-10-08 |
Evolution of grain structure in AA2195 A1-Li alloy plate during recrystallization |
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| DU Yu-xuan, ZHANG Xin-ming, YE Ling-ying, LIU Sheng-dan. Evolution of grain structure in AA2195 A1-Li alloy plate during recrystallization[J]. Transactions of Nonferrous Metals Society of China, 2006, 16(2): 321-326. DOI: 10.1016/S1003-6326(06)60055-1 |
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| Authors: | DU Yu-xuan ZHANG Xin-ming YE Ling-ying LIU Sheng-dan |
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| Affiliation: | 1. School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;2. Light Alloy Research Institute of Central South University, State Key Laboratory of High-Performance Complex Manufacturing, Changsha 410083, China |
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| Abstract: | The evolution of the grain structures in AA2195 Al-Li alloy plate warm-rolled by 80% reduction during recrystallization annealing at 500 °C was investigated by electron backscatter diffraction, scanning electron microscopy and transmission electron microscopy. It is found that the elongated grain structures are caused by the lamellar distribution of recrystallization nucleation sites, being lack of large second phase particles (> 1 μm), and dispersive coherent particles (such as δ′ and β′) concentrated in planar bands. The recrystallization process may be separated into three stages: firstly, recrystallization nucleation occurs heterogeneously, and the nuclei are concentrated in some planar zones parallel to rolling plane. Secondly, the grain boundaries interacted with small particles concentrate in planar bands, which is able to result in the elongated grain structures. The rate of the grain growth is controlled by the dissolution of these small particles. Thirdly, after most of small particles are dissolved, their hindrance to migration of the grain boundaries fades away, and the unrecrystallized zones are consumed by adjacent recrystallized grains. The migration of high angle grain boundaries along normal direction leads a gradual transformation from the elongated grains to the nearly equiaxed, which is driven by the tension of the grain boundaries. |
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| Keywords: | AA2195 Al-Li alloy rnicrostructure evolution elongated grains equiaxed grains recrystallization second phase particles |
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