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本文采用类金属透明模型合金丁二腈-23.6 wt%樟脑 (SCN-23.6 wt%DC) 合金, 研究了棒状共晶定向凝固组织的演化行为, 考察了抽拉速度对棒状共晶合金组织形貌演化的影响规律. 结果表明, 在共晶生长初期, 共晶组织首先起源于晶粒晶界或者试样盒型壁处, 随后沿液/固界面和平行于热流方向生长; 在较小的抽拉速度 (0.064–0.44 μm/s)下, 棒状共晶界面前沿呈现平界面形态, 内部两相棒状组织平行生长, 并且随着抽拉速度的增大,棒状共晶逐渐细化, 棒状间距减小; 而在较大的抽拉速度 (0.67–1.56 μm/s)下, 共晶界面前沿呈现胞状生长形貌, 胞内的棒状共晶呈放射状生长, 同样, 随着抽拉速度的增大, 胞内棒状共晶逐渐细化, 棒状间距减小.Eutectic solidification is very important in the development of new materials in which the periodic multiphase structures may have a remarkable or enhanced functionality. The morphology evolution during eutectic solidification is investigated experimentally using slab-geometry slides of succinonitrile-(D)camphor (SCN-DC) transparent organic eutectic material. By specifically focusing on the effect of pulling velocity on microstructure in directional growth, the temperature gradient and the thickness are kept the same in all the experiments. It is found that eutectic seeds first occur in the grain boundary channel or the specimen side-wall groove. And the growth of eutectic seeds is both parallel to the direction of temperature gradient and along the liquid/solid interface at the same time. At a low pulling velocity (0.064–0.44 μm/s), the macroscopic growth morphology is flat, and the inner microstructure is rod-shaped, which is parallel to the growth direction. It is obvious that the eutectic spacing becomes smaller with the increase of pulling velocity. At a high pulling velocity (0.67–1.56 μm/s), the macroscopic growth morphology becomes cellular. However, the inner microstructure is still rod-shaped, but its distribution is radially outward. And the eutectic spacing decreases as pulling velocity increases.
[1] Agular M R, Caram R 1996 Journal of Crystal Growth 166 398
[2] Cadirli E, Kaya H, Gunduz M 2007 Journal of Alloys and Compound 431 171
[3] Ginibre M, Akamatsu S, Faivre G 1997 Phys. Rev. 56 780
[4] Datye V, Langer J S 1981 Phys. Rev. 24 4155
[5] Meng Guanghui, Lin X, Du L C, Huang W D 2007 Acta Metall. Sin. 43 459 (in Chinese) [孟广慧, 林鑫, 杜立成, 黄卫东 2007 金属学报 43 459]
[6] Li J F, Zhou Y H 2005 Science in China Ser. E 35 449 (in Chinese) [李金富, 周尧和 2005 中国科学E辑 35 449]
[7] Seetharaman V, Eshelman, Trivedi R 1988 Acta Metall. 36 1175
[8] Jackson K A, Hunt J D 1966 Transaction of the Metallurgical Society of AIME 236 1129
[9] Trivedi R, Magnin P, Kurz W 1987 Acta Metall. 35 971
[10] Kurz W, Trivedi R 1991 Metallurgical Transactions A 22 3051
[11] Li J F, Zhou Y H 2005 Acta Materialia 53 2351
[12] Liu J M, Liu Zh G, W Zh C 1993 Chin. Phys. Lett. 10 253
[13] Yao X D, H T, Zhou Y H, Hu Z Q 1997 Progress in Nature Science 7 24 (in Chinese) [姚向东, 黄韬, 周尧和, 胡壮麒 1997 自然科学进展 7 24]
[14] Akamatsu S, Bottin-Rousseau S, Perrut M, Faivre G, Witusiewicz V T, Sturz L 2007 Journal of Crystal Growth 299 418
[15] ]Serefoglu M, Napolitano R E 2011 Acta Materialia 59 1048
[16] Teng J, Liu S, Trivedi R 2008 Acta Materialia 56 2819
[17] Zhu Y C, Wang J C, Yang G C, Zhao D W 2007 Chin. Phys. 16 805
[18] Wu M W, Xiong S M 2011 Acta Phys. Sin. 60 058103 (in Chinese) [吴孟武, 熊守美 2011 60 058103]
[19] Yang Y J, Wang J C, Zhang Y X, Zhu Y C, Yang G C 2009 Acta Phys. Sin. 58 2797 (in Chinese) [杨玉娟, 王锦程, 张玉祥, 朱耀产, 杨根仓 2009 58 2797]
[20] Zhu Y C, Wang J C, Yang G C, Yang Y J 2007 Acta Phys. Sin. 56 5542 (in Chinese) [朱耀产, 王锦程, 杨根仓, 杨玉娟 2007 56 5542]
[21] Melis Serefoglu, R E Napolitano 2008 Acta Materialia 56 3862
[22] Meng G H 2008 Ph.D. Dissertation (Xi’an: Northwestern Polytechnical University) (in Chinese) [孟广慧 2008 西北工业大学博士论文 (西安: 西北工业大学)]
[23] Zhao S, L J F, Liu L, Zhou Y H 2008 Acta Metall. Sin. 44 1335 (in Chinese) [赵素, 李金富, 刘礼, 周尧和 2008 金属学报 44 1335]
[24] Liu J M 1992 Acta Phys. Sin. 41 861(in Chinese) [刘俊明 1992 41 861]
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[1] Agular M R, Caram R 1996 Journal of Crystal Growth 166 398
[2] Cadirli E, Kaya H, Gunduz M 2007 Journal of Alloys and Compound 431 171
[3] Ginibre M, Akamatsu S, Faivre G 1997 Phys. Rev. 56 780
[4] Datye V, Langer J S 1981 Phys. Rev. 24 4155
[5] Meng Guanghui, Lin X, Du L C, Huang W D 2007 Acta Metall. Sin. 43 459 (in Chinese) [孟广慧, 林鑫, 杜立成, 黄卫东 2007 金属学报 43 459]
[6] Li J F, Zhou Y H 2005 Science in China Ser. E 35 449 (in Chinese) [李金富, 周尧和 2005 中国科学E辑 35 449]
[7] Seetharaman V, Eshelman, Trivedi R 1988 Acta Metall. 36 1175
[8] Jackson K A, Hunt J D 1966 Transaction of the Metallurgical Society of AIME 236 1129
[9] Trivedi R, Magnin P, Kurz W 1987 Acta Metall. 35 971
[10] Kurz W, Trivedi R 1991 Metallurgical Transactions A 22 3051
[11] Li J F, Zhou Y H 2005 Acta Materialia 53 2351
[12] Liu J M, Liu Zh G, W Zh C 1993 Chin. Phys. Lett. 10 253
[13] Yao X D, H T, Zhou Y H, Hu Z Q 1997 Progress in Nature Science 7 24 (in Chinese) [姚向东, 黄韬, 周尧和, 胡壮麒 1997 自然科学进展 7 24]
[14] Akamatsu S, Bottin-Rousseau S, Perrut M, Faivre G, Witusiewicz V T, Sturz L 2007 Journal of Crystal Growth 299 418
[15] ]Serefoglu M, Napolitano R E 2011 Acta Materialia 59 1048
[16] Teng J, Liu S, Trivedi R 2008 Acta Materialia 56 2819
[17] Zhu Y C, Wang J C, Yang G C, Zhao D W 2007 Chin. Phys. 16 805
[18] Wu M W, Xiong S M 2011 Acta Phys. Sin. 60 058103 (in Chinese) [吴孟武, 熊守美 2011 60 058103]
[19] Yang Y J, Wang J C, Zhang Y X, Zhu Y C, Yang G C 2009 Acta Phys. Sin. 58 2797 (in Chinese) [杨玉娟, 王锦程, 张玉祥, 朱耀产, 杨根仓 2009 58 2797]
[20] Zhu Y C, Wang J C, Yang G C, Yang Y J 2007 Acta Phys. Sin. 56 5542 (in Chinese) [朱耀产, 王锦程, 杨根仓, 杨玉娟 2007 56 5542]
[21] Melis Serefoglu, R E Napolitano 2008 Acta Materialia 56 3862
[22] Meng G H 2008 Ph.D. Dissertation (Xi’an: Northwestern Polytechnical University) (in Chinese) [孟广慧 2008 西北工业大学博士论文 (西安: 西北工业大学)]
[23] Zhao S, L J F, Liu L, Zhou Y H 2008 Acta Metall. Sin. 44 1335 (in Chinese) [赵素, 李金富, 刘礼, 周尧和 2008 金属学报 44 1335]
[24] Liu J M 1992 Acta Phys. Sin. 41 861(in Chinese) [刘俊明 1992 41 861]
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