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The directional cellular growth of SCN-0.2%Salol transparent alloy in the presence of shear flow at the liquid-solid interface is in-situ observed, and the cellular spacing adjusting mechanism is carefully investigated. It is found that the cellular array deflects forward the incoming flow direction, and the stable cellular spacing decreases with the increase of the flow rate. This is due mainly to the reducing destabilization wavelength caused by shear flow. Instead of the double symmetric splitting mode under static condition, the splitting mechanism of cellular growth exhibits multiplicity, which is characterized mainly by (i) multi-splitting and asymmetric splitting, and (ii) secondary branches appearing on the upstream side whose growth direction subsequently shifts to ward the direction paralleled to the trunk to form new cells. Meanwhile, the selected mechanism transits from the weak cells eliminated by the relatively strong ones on both sides during static solidification to the growth of weak cells on the downstream side suppressed by the stronger cells at the upstream side when shear flow is applied.
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Keywords:
- shear flow /
- directional cellular growth /
- spacing adjustment
[1] Verhoven J 1971 Metall. Trans. 2 2673
[2] Billia B, Jamgotchian H, Trivedi R 1990 J. Crystal Growth 106 410
[3] Georgelin M, Pocheau A 2004 J. Crystal Growth 268 272
[4] Zhai W,Wang N,Wei B B 2007 Acta Phys. Sin. 56 2353 (in Chinese) [翟 薇、 王 楠、 魏炳波 2007 56 2353]
[5] Xing H, Wang J Y, Chen C L, Jin K X, Shen Z F 2010 Scripta Materialia 63 1228
[6] Wang J Y, Chen C L, Zhai W, Jin K X 2009 Acta. Phys. Sin. 58 6554 (in Chinese) [王建元、 陈长乐、 翟 薇、 金克新 2009 58 6554]
[7] Ivantsov G P 1947 Dokl. Akad. Nauk. SSSR 558 567
[8] Trivedi R 1970 Acta Metall. 18 287
[9] Mullins W W, Sekerka R F 1964 J. App. Phys. 35 444
[10] Hunt J D 1979 Solidification and Casting of Metals, The Metals Society, London, p3
[11] Kurz W, Fisher D 1981 Acta Metall. 29 11
[12] Trivedi R 1984 Metall. Trans. 15 A 977
[13] Liu S, Lu D Y, Huang T, Zhou Y H 1993 Acta Metallurgica Sinica 29 A 148 (in Chinese) [刘 山、 鲁德洋、 黄 韬、 周尧和 1993 金属学报 29 A 148]
[14] Mao Y J, Liu J, Zhou Y H 1997 Journal of Synthetic Crystals 26 47 (in Chinese) [毛应俊、 刘 建、 周尧和 1997 人工晶体学报 26 47]
[15] Zhang M, Maxworth T 2002 J. Fluid .Mesh. 470 247
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[1] Verhoven J 1971 Metall. Trans. 2 2673
[2] Billia B, Jamgotchian H, Trivedi R 1990 J. Crystal Growth 106 410
[3] Georgelin M, Pocheau A 2004 J. Crystal Growth 268 272
[4] Zhai W,Wang N,Wei B B 2007 Acta Phys. Sin. 56 2353 (in Chinese) [翟 薇、 王 楠、 魏炳波 2007 56 2353]
[5] Xing H, Wang J Y, Chen C L, Jin K X, Shen Z F 2010 Scripta Materialia 63 1228
[6] Wang J Y, Chen C L, Zhai W, Jin K X 2009 Acta. Phys. Sin. 58 6554 (in Chinese) [王建元、 陈长乐、 翟 薇、 金克新 2009 58 6554]
[7] Ivantsov G P 1947 Dokl. Akad. Nauk. SSSR 558 567
[8] Trivedi R 1970 Acta Metall. 18 287
[9] Mullins W W, Sekerka R F 1964 J. App. Phys. 35 444
[10] Hunt J D 1979 Solidification and Casting of Metals, The Metals Society, London, p3
[11] Kurz W, Fisher D 1981 Acta Metall. 29 11
[12] Trivedi R 1984 Metall. Trans. 15 A 977
[13] Liu S, Lu D Y, Huang T, Zhou Y H 1993 Acta Metallurgica Sinica 29 A 148 (in Chinese) [刘 山、 鲁德洋、 黄 韬、 周尧和 1993 金属学报 29 A 148]
[14] Mao Y J, Liu J, Zhou Y H 1997 Journal of Synthetic Crystals 26 47 (in Chinese) [毛应俊、 刘 建、 周尧和 1997 人工晶体学报 26 47]
[15] Zhang M, Maxworth T 2002 J. Fluid .Mesh. 470 247
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