Acta Metall Sin  2005, Vol. 41 Issue (4): 411-416     DOI:

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Microstructure And Its Scales Of Cu--70%Sn Peritectic Alloy Under High—Temperature Gradient Directional Solidification

LI Shuangming; MA Baile; LŰ Haiyan; LIU Lin; FU Hengzhi

State Key Laboratory of Solidification Processing; Northwestern Polytechnical University; Xi'an 710072

LI Shuangming; MA Baile; L&#; Haiyan; LIU Lin; FU Hengzhi. Microstructure And Its Scales Of Cu--70%Sn Peritectic Alloy Under High—Temperature Gradient Directional Solidification. Acta Metall Sin, 2005, 41(4): 411-416 .

Abstract References Related Articles Recommended Metrics Download:  PDF(321KB)  Export:  BibTeX | EndNote (RIS)       Abstract  Directionally solidified microstructures of Cu-70%Sn peritectic alloy have been investigated by means of the directional solidification technique. The results show that the solidified microstructure consists of primary , peritectic  and the eutectic phase (+Sn), which is different from the equilibrium microstructure consisting of  phase and eutectic phase. The theoretical analysis results indicate that  phase can be directly precipitated from melt, as the growth rate is more than 22.35 mm/s. At the growth rate ranging from 1 to 5 m/s, the size of  phase doesn’t decrease due to the change of the solid transformation coefficient between  and  phases, which contributes to the peritectic transformation. With the increase of growth rate, the volume fraction of  phase firstly decreases and then increases. The primary dendritic arm spacing ( ) of Cu-70%Sn alloy and growth rate (V) have a relation of V0.325=199.5 m1.325s-0.325 as the growth rate is less than 50 m/s. While, at the growth rate from 50 to 500m/s, the value of V0.528 is equal to 676 m1.528s-0.528. Key words:  directional solidification      Cu--70%Sn peritectic alloy       Received:  23 June 2004      ZTFLH:  TG132.32   Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors LI Shuangming MA Baile L&# Haiyan LIU Lin FU Hengzhi URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y2005/V41/I4/411 [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. 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