Formation of Cu-rich Sphere Phase in Cu-80wt%Pb Hypermonotectic Alloys and the Effect of High Magnetic Field
Lin Zhang;;Xiaowei Zuo;Jicheng He
Cite this article:
Lin Zhang; Xiaowei Zuo; Jicheng He. Formation of Cu-rich Sphere Phase in Cu-80wt%Pb Hypermonotectic Alloys and the Effect of High Magnetic Field. Acta Metall Sin, 2008, 44(2): 165-171 .
Abstract The solidification process of Cu-80wt%Pb hypermonotectic alloys was investigated in four different experiment conditions. The formation process and structure of Cu-rich sphere phase has been analyzed, and the influence of high magnetic field and cooling rate have been considered. The results show that the morphology of spherical Cu-rich phases mainly has three kinds of microstructure, that is the larger “net-shell type” and the smaller “egg-type” or “eye-type”. The cooling rate of the samples has great effect on both macrostructure and microstructure. As the cooling rate become slow, the Cu-rich phase changed from the fine sphere to the larger floating sphere and the finally coarse dendrite, and the thickness of Cu-shell and reticulum of Cu-Pb in Cu-rich sphere phase became coarser; The 12T high magnetic fields have a remarkably effect of restraining the gravity segregation of Cu-Pb alloy by preventing from the floating of larger Cu-rich droplets and sedimentation of Pb-matrix, so that a macrostructure and microstructure of Cu-Pb monotectic alloy similar to one under relative fast cooling rate is formed. And the 12T high magnetic field maybe has the effect to inhibit the transition of Cu solute both outside and inside of Cu-rich sphere phase, which inhibit the Cu-rich shell from becoming thicker, and the Cu-Pb “net-like” phase from coarsening.
[1]Ratke L,Diefenbach S.Mater Sci Eng,1995;15R:263 [2]Kiessler G,Ratke L,Thieringer W K.Praktische Metal- lographie,1986;23:363 [3]Prinz B,Romero A,Ratke L.J Mater Sci,1995;30:4715 [4]Rathz T J,Robinson M B,Li D,Workman G L,Williams G.J Mater Sci,2001;36:1183 [5]Ojha S N,Chattopadhyay K.Trans Indian Inst Met,1978; 31:208 [6]Kamio A,Kumai S,Tezuka H.Mater Sci Eng,1991;A146: 105 [7]Grugel R N,Hellawell A.Metall Trans,1981;12A:669 [8]Dhindaw B K,Stefanescu D M,Singh A K,Curreri P A. Metall Trans,1988;19A:2839 [9]Aoi I,Makoto I,Yoshida M,Fukunaga H,Nakae H.J Cryst Growth,2001;222:806 [10]Zhao J Z.Acta Metall Sin,2002;38:525 (赵九洲．金属学报，2002；38：525) [11]Liu Y,Guo J J,Jia J,Su Y Q,Ding H S.Acta Metall Sin, 2000;36:1233 (刘源，郭景杰，贾均，苏彦庆，丁宏升．金属学报，2000；36：1233) [12]Zheng H X,Chen Z L,Guo X F.Chin J Nonferrous Met, 2001;11(S2):148 (郑红星，陈悼麟，郭学锋．中国有色金属学报，2001；11(S2)：148) [13]Yang S,Liang W X,Jia J.Foundry Technol,1999;(5):44 (杨森，梁文心，贾均．铸造技术，1999；(5)：44) [14]Yasuda H,Ohnaka I,Kawakami O,Ueno K,Kishio K. ISIJ Int,2003;43:942 [15]Yasuda H,Ohnaka I,Fujimoto S,Sugiyama A,Hayashi Y,Yamamoto M,Tsuchiyama A,Nakano T,Uesugi K, Kishio K.Mater Lett,2004;58:911 [16]Yasuda H,Ohnaka I,Fujimoto S,Takezawa N, Tsuchiyama A,Nakano T,Uesugi K.Scr Mater,2006; 54:527 [17]Wang E G,Zhang L,Liu C C,He J C.In:Chinese Ma- terials Research Society ed.,The New Pro9ress on Mate- rial Science and Engineer,Beijing:Metallurgical Industry Press,2005:1310 (王恩刚，张林，刘长春，赫冀成．见：中国材料研究学会主编，2004年材料科学与工程新进展，北京：冶金工业出版社，2005：1310) [18]Dai G C,Chen M H.Chemical Hydromechanics.Beijing: Chemical Industry Press,1988:689 (戴干策，陈敏恒．化工流体力学．北京：化学工业出版社，1988：689) [19]Chester W.J Fluid Mech,1957;3:304 [20]Reitz J R,Foldy L L.J Fluid Mech,1961;11:133
