在凝固速率1-500 μm/s的范围内,Cu-70%Sn包晶合金定向凝固组织由ε相、包晶η相和共晶体组成,ε相为领先相与最高界面生长温度假设的分析一致.理论计算结果显示,当凝固速率大于22.35 mm/s时,η相可直接从液相中析出,无需通过包晶反应进行.凝固速率越低,ε向η相固相转变系数越大,造成ε相尺寸在1-5 μm/s范围内变化很小,而包晶η相的体积分数随凝固速率的增加呈现先减后增的变化趋势.在凝固速率小于50 μm/s时,Cu-70%Sn包晶合金一次枝晶间距满足λV0.325=199.5 μm1.325.s-0.325;在凝固速率高于50 μm/s时,一次枝晶间距满足λV0.528=676 μm1.528.s-0.528.
参考文献
| [1] | Brody H D, David S A. Int Conf on Solidification and Casting. London: Institute of Metals, 1977:144 |
| [2] | Trivedi R. Metall Mater Trans, 1995; 26A: 1583 |
| [3] | Lao T S, Dobler S, Plapp M, Karma A, Kurz W. Acta Mater, 2003; 51:599 |
| [4] | Kerr H W, Kurz W. Int Mater Rev, 1996; 41(4): 129 |
| [5] | Lee J H, Verhoeven J D. J Cryst Growth, 1994; 144:353 |
| [6] | Johnson D R, Inui H, Yamaguchi M. Intermetallics, 1998;6:647 |
| [7] | Schmitz G J, Laakmann J, Wolters C, Rex S. J Mater Res, 1993; 8:2774 |
| [8] | Loser W, Herlach D M. Metall Trans, 1992; 23A: 1585 |
| [9] | Umeda T, Okane T, Kurz W. Acta Mater, 1996: 44:4209 |
| [10] | Boettinger W J, Coriell S R, Greer A L, Karma A, Kurz W, Rappaz M, Trivedi R. Acta Mater, 2000; 48(1): 43 |
| [11] | Ha H P, Hunt J D. Metall Mater Trans, 2000; 31A: 29 |
| [12] | Saunders N, Miodownik A P. In: Phase Diagrams of Binary Copper alloys. USA: ASM Int, 1994:412 |
| [13] | Fredriksson H, Nylen T. Met Sci, 1982; 16(6): 283 |
| [14] | Zou G R. PhD Thesis, Northwestern Polytechical University. Xi'an, 2000(邹光荣.西北工业大学博士学位论文,2000) |
| [15] | Kurz W, Fisher D J. Fundamentals of Solidification.Switzerland: Trans Tech Pub. 1984:81 |
| [16] | St John D H, Hogan L M. Acta Metall, 1977; 25:77 |
| [17] | Burden M H, Hunt J D. J Cryst Growth, 1974; 22:99 |
| [18] | Hunt J D, Lu S Z. Metall Mater Trans, 1996; 27A(3): 611 |
| [19] | Wang M, Lin X, Su Y P, Shen S J, Huang W D. Acta Metall Sin, 2002; 38:337(王猛,林鑫,苏云鹏,沈淑娟,黄卫东.金属学报,2002;38:337) |
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