金属学报  2011, Vol. 47 Issue (1): 81-87    DOI: 10.3724/SP.J.1037.2010.00470

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磁场作用下Al-Pb偏晶合金的凝固过程

李海丽, 赵九洲

中国科学院金属研究所, 沈阳 110016

SOLIDIFICATION OF Al-Pb MONOTECTIC ALLOY UNDER A STATIC MAGNETIC FIELD

LI Haili, ZHAO Jiuzhou

Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

李海丽 赵九洲. 磁场作用下Al-Pb偏晶合金的凝固过程[J]. 金属学报, 2011, 47(1): 81-87.
, . SOLIDIFICATION OF Al-Pb MONOTECTIC ALLOY UNDER A STATIC MAGNETIC FIELD[J]. Acta Metall Sin, 2011, 47(1): 81-87.

摘要 参考文献 相关文章 Metrics 全文: PDF(1232 KB)   摘要: 在恒定磁场作用下对Al-Pb合金进行定向凝固实验, 考察了合金成分、凝固速度、恒定磁场对凝固组织的影响. 模拟研究了恒定磁场作用下Al-Pb合金定向凝固组织的形成过程, 分析了磁场的影响机理和合金成分、凝固速度、磁场强度对弥散型凝固组织获得的影响. 模拟和实验均表明恒定磁场促进弥散型偏晶合金凝固组织的形成. 关键词 ： Al-Pb偏晶合金,  恒定磁场,  凝固,  数值模拟,  液-液相变     Abstract：A static magnetic field has great effect on the solidification structure of monotectic alloys, so the rapid directional solidification in a static magnetic field has great potentials in the manufacturing of monotectic alloys. But up to date little is known about the details of the effect of the magnetic field on the microstructure development during liquid-liquid decomposition. Directional solidification experiments with Al-Pb monotectic alloys in a static magnetic field were carried out, and the effects of the field intensity and the solidification velocity on the solidification microstructure were investigated. Samples with well-dispersed microstructure were obtained. A model was proposed to describe the microstructure evolution in a monotectic alloy solidified in a static magnetic field, which was verified by comparing with experimental results and then applied to investigate the microstructure formation in the unidirectionally solidified Al-Pb alloys. The numerical results indicate that the convective flow of the melt is very strong during the liquid-liquid phase transformation, and leads to a nonuniform distributions of the nucleation rate, number density, average radius and volume fraction of the minority phase droplets along the radial direction of the sample, resulting in serious phase segregation in solidified structure. A static magnetic field can effectively suppress the convective flow and causes a more uniform distributions of the nucleation rate, number density, average radius and volume fraction of the minority phase droplets. The application of a static magnetic field is favorable for the formation of a well dispersed microstructure. The lower the Pb content of the alloy and the higher the solidification velocity, the lower the intensity of the magnetic field needed for obtaining a sample with homogeneous distribution of the minority phase particles. Key words： Al-Pb monotectic alloy    static magnetic field    solidification    simulation    liquid-liquid transformation 收稿日期: 2010-09-13      基金资助: 国家自然科学基金项目u0837601, 51071159和51031003资助 作者简介: 李海丽, 女, 1979年生, 博士 服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 李海丽 赵九洲 44.8K 链接本文: https://www.ams.org.cn/CN/10.3724/SP.J.1037.2010.00470      或      https://www.ams.org.cn/CN/Y2011/V47/I1/81 [1] Liu Y, Guo J J, Jia J. Foundry, 2000; 49: 11 (刘源, 郭景杰, 贾均. 铸造, 2000; 49: 11) [2] Inoue A, Yano N. J Mater Sci, 1987; 22: 123 [3] Wecker J, Hehnolt R, Schulta L, Samwer K. Appl Phys Lett, 1993; 52: 1985 [4] Kolbe M, Brillo J, Egry I. Microgravity Sci Technol, 2006; 18: 174 [5] Cao C D, Wei B B. J Mater Sci Technol, 2002; 18: 73 [6] Xu J F, Dai F P,Wei B B. 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