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The rapid solidification of ternary NiAl-Mo eutectic alloy is investigated by using melt-spinning technique, and the conventional casting is also carried out for a comparison study. The phase constitutions of the alloy samples obtained from different experiments each include both B2-NiAl intermetallic and bcc-Mo solid solution, which are both presented in the 〈110〉priority growth direction. The growth orientation relationship of the coupled two eutectic phases are obtained to be (110)NiAl//(110)Mo. The cast alloy is composed mainly of two regular eutectic phases in structure and exhibits daisy-like eutectic cells. However, the melt-spinning ribbons show the microstructures of the columnar grain near the roller surface zone and the equiaxed grain near the air zone. With the wheel speed increasing from 10 m/s to 50 m/s, the cooling rate of the alloy ribbons increases from 1.01×107 K/s to 2.46×107 K/s, while the thickness of alloy ribbons decreases from 49.4 μm to 22 μm. Meanwhile, the volume fraction of columnar grain zone increases gradually, and the grains are refined obviously. The cooling rate in the melt-spinning experiment for alloy ribbon is obviously higher than that in the conventional casting test, which leads to a significant difference in solidification microstructure between two techniques.
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Keywords:
- rapid solidification /
- ternary eutectic /
- eutectic transformation /
- cooling rate
[1] Bei H, George P G 2005 Acta Mater. 53 69
[2] Ferrandini P, Batista W W, Caram R 2004 J. Alloys Compd. 381 91
[3] Gao Q, Guo J T, Huai K W 2007 Intermetallics 15 734
[4] Tang L Z, Zhang Z G, Li S S, Gong S K 2010 Trans. Nonferrous Met. Soc. China 20 212
[5] Sun H P, Shen J, Zhang J F, Fu H Z 2010 Rare Metal Mat. Eng. 39 1009 (in Chinese) [苏慧平, 沈 军, 张建飞, 傅恒志 2010 稀有金属材料与工程 39 1009]
[6] Liang Y C, Guo J T, Zhou L Z, Zhang C L, Lin J D 2010 Mater. Lett. 64 1707
[7] Ebrahimi F, Shrivatava S 1998 Acta Mater. 46 1493
[8] Gali A, Bei H, George E P 2010 Acta Mater. 58 421
[9] Rablbauer R, Fischer R, Frommeyer G 2004 Z. Metallkd. 95 525
[10] Frommeyer G, Rablbauer R, Schafer H J 2010 Intermetallics 18 299
[11] Xie Y, Guo J T, Zhou L Z, Chen H D, Long O Y 2010 Trans. Nonferrous Met. Soc. China 20 2265
[12] Deputier S, Guerin R, Ballini Y, Guivarch A 1995 J. Alloys Compd. 217 13
[13] Zhang Q A, Zhao G P, Hou Q Y, Wu H Y 2005 Mater. Sci. Eng. A 397 113
[14] Dudova M, Kucharova K, Bartak T, Bei H, George E P, Somsen C, Dlouhy A 2011 Scripta Mater. 65 699
[15] Poirier D, Salcudean M 1988 J. Heat Transfer 110 562
[16] Xu J F, Wei B B 2004 Acta Phys. Sin. 53 1909 (in Chinese) [徐锦锋, 魏炳波 2004 物理学报 53 1909]
[17] Li Z Q, Wang W L, Zhai W, Wei B B 2011 Acta Phys. Sin. 60 108101 (in Chinese) [李志强, 王伟丽, 翟薇, 魏炳波 2011 物理学报 60 108101]
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[1] Bei H, George P G 2005 Acta Mater. 53 69
[2] Ferrandini P, Batista W W, Caram R 2004 J. Alloys Compd. 381 91
[3] Gao Q, Guo J T, Huai K W 2007 Intermetallics 15 734
[4] Tang L Z, Zhang Z G, Li S S, Gong S K 2010 Trans. Nonferrous Met. Soc. China 20 212
[5] Sun H P, Shen J, Zhang J F, Fu H Z 2010 Rare Metal Mat. Eng. 39 1009 (in Chinese) [苏慧平, 沈 军, 张建飞, 傅恒志 2010 稀有金属材料与工程 39 1009]
[6] Liang Y C, Guo J T, Zhou L Z, Zhang C L, Lin J D 2010 Mater. Lett. 64 1707
[7] Ebrahimi F, Shrivatava S 1998 Acta Mater. 46 1493
[8] Gali A, Bei H, George E P 2010 Acta Mater. 58 421
[9] Rablbauer R, Fischer R, Frommeyer G 2004 Z. Metallkd. 95 525
[10] Frommeyer G, Rablbauer R, Schafer H J 2010 Intermetallics 18 299
[11] Xie Y, Guo J T, Zhou L Z, Chen H D, Long O Y 2010 Trans. Nonferrous Met. Soc. China 20 2265
[12] Deputier S, Guerin R, Ballini Y, Guivarch A 1995 J. Alloys Compd. 217 13
[13] Zhang Q A, Zhao G P, Hou Q Y, Wu H Y 2005 Mater. Sci. Eng. A 397 113
[14] Dudova M, Kucharova K, Bartak T, Bei H, George E P, Somsen C, Dlouhy A 2011 Scripta Mater. 65 699
[15] Poirier D, Salcudean M 1988 J. Heat Transfer 110 562
[16] Xu J F, Wei B B 2004 Acta Phys. Sin. 53 1909 (in Chinese) [徐锦锋, 魏炳波 2004 物理学报 53 1909]
[17] Li Z Q, Wang W L, Zhai W, Wei B B 2011 Acta Phys. Sin. 60 108101 (in Chinese) [李志强, 王伟丽, 翟薇, 魏炳波 2011 物理学报 60 108101]
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