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DIRECTIONAL SOLIDIFICATION OF MONOTECTIC COMPOSITION Al-Bi ALLOY |
YANG Zhizeng, SUN Qian, ZHAO Jiuzhou() |
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 |
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Cite this article:
YANG Zhizeng, SUN Qian, ZHAO Jiuzhou. DIRECTIONAL SOLIDIFICATION OF MONOTECTIC COMPOSITION Al-Bi ALLOY. Acta Metall Sin, 2014, 50(1): 25-31.
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Abstract Monotectic systems are a kind of extensive alloys. Many of them have great potentials for practical industry application. A lot of work has been carried out to study the solidification of monotectic alloys. But most of them focused on the microstructure formation during cooling a hyper-monotectic alloy through the miscibility gap in the liquid. Little work was done on the solidification behaviors of an alloy of monotectic composition. Directional solidification experiments were carried out with Al-Bi alloy of the monotectic composition (Al-3.4%Bi, mass fraction). The influences of the solidification velocity on the microstructure were investigated. The microstructure evolution during solidification was analyzed. The results indicate that a solute-rich layer forms in front of the solidification interface and the liquid-liquid decomposition occurs there. When the alloy is solidified at such a high velocity so that the minority phase droplets of all sizes in front of the solidification interface are migrating to the solidification interface, the size distribution of the minority phase particles shows only one peak. When the alloy is solidified at a relatively low velocity, the minority phase droplets within a certain size range may move away from the solidification interface under the concurrent actions of the Marangoni migration, Stokes motion of the droplets as well as the movement of the sample. Al-3.4%Bi alloy solidified under such conditions shows a size distribution of the minority phase particles with two peaks. The average radius of the minority phase particles depends on the solidification velocity exponentially according to. With the decrease of the solidification velocity, the dependence of the average radius of the minority phase particles varies towards to .
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Received: 13 September 2013
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Fund: Supported by National Natural Science Foundation of China (Nos.51071159, 51271185 and 51031003) and China Manned Space Engineering |
[1] |
Jia J,Zhao J Z,Guo J J,Liu Y. Preparation Techniques of Immiscible Alloy. Harbin: Harbin Institute of Technology Press, 2002: 2
|
|
(贾 均,赵九州,郭景杰,刘 源. 难混溶合金及其制备技术. 哈尔滨: 哈尔滨工业大学出版社, 2002: 2)
|
[2] |
Pratt G C.Int Met Rev, 1973; 18: 62
|
[3] |
Guo J J, Gui H B, Su Y Q, Bi W S, Jia J, Fu H Z.Spec Cast Nonfer Alloys, 2004; 1: 1
|
|
(郭景杰, 崔红保, 苏彦庆, 毕维生, 贾 均, 傅恒志. 特种铸造及有色合金, 2004; 1: 1)
|
[4] |
Zheng H X, Xie H, Chen Z L, Yang G C, Guo X F.Chin J Nonferrous Met, 2002; 26: 15
|
|
(郑红星, 谢 辉, 陈倬麟, 杨根仓, 郭学峰. 稀有金属, 2002; 26: 15)
|
[5] |
Zhu D, Yang X H, Han X J, Wei B B.Chin J Nonferrous Met, 2003; 13: 328
|
|
(朱 定, 杨晓华, 韩秀君, 魏炳波. 中国有色金属学报, 2003; 13: 328)
|
[6] |
Rudrakshi G B, Srivastava V C, Pathak J P, Ojha S N.Mater Sci Eng, 2004; A383: 30
|
[7] |
Liu Y, Guo J J, Jia J.Foundry, 2000; 49: 11
|
|
(刘 源, 郭景杰, 贾 均. 铸造, 2000; 49: 11)
|
[8] |
Carlberg T, Fredriksson H.Metall Trans, 1980; 11A: 1665
|
[9] |
Zhang H W, Xian A P. Acta Metall Sin, 1999; 35: 1187
|
|
(张宏闻, 冼爱平. 金属学报, 1999; 35: 1187)
|
[10] |
Yang S, Liu W J.J Mater Sci, 2001; 36: 5351
|
[11] |
Zhao J Z, Ratke L.Scr Mater, 1988; 39: 181
|
[12] |
Zhao J Z, Hu Z Q.Acta Metall Sin, 2004; 40: 27
|
|
(赵九洲, 胡壮麒. 金属学报, 2004; 40: 27)
|
[13] |
Cui H B, Guo J J, Su Y Q, Wu S P, Li X Z, Fu H Z.Acta Metall Sin, 2007; 43: 907
|
|
(崔红保, 郭景杰, 苏彦庆, 吴士平, 李新中, 傅恒志. 金属学报, 2007; 43: 907)
|
[14] |
Zhao J Z.Scr Mater, 2006; 54: 247
|
[15] |
He J. PhD Dissertation, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 2006
|
|
(何 杰. 中国科学院金属研究所博士学位论文, 沈阳, 2006)
|
[16] |
Yang S, Liu W J, Jia J.Prog Nat Sci, 2001; 11: 729
|
|
(杨 森, 刘文今, 贾 均. 自然科学进展, 2001; 11: 729)
|
[17] |
Zhao J Z, Guo J J, Jia J, Li Q C.Chin J Nonferrous Met, 1994; 4(suppl): 164
|
|
(赵九洲, 郭景杰, 贾 均, 李庆春. 中国有色金属学报, 1994; 4(增刊): 164)
|
[18] |
Zhao J Z, Li H L, Zhao L.Acta Metall Sin, 2009; 45: 1435
|
|
(赵九洲, 李海丽, 赵 雷. 金属学报, 2009; 45: 1435)
|
[19] |
Zhao J Z.Mater Sci Technol, 2001; 9: 154
|
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