ࡱ> pro%` R 8bjbjNNg,,,7 D"""\#\#,>,##$$$,RT,p,=======$@h"Ct=2F+J+22= $$@H>8882T $`8$=82=88;6*i;$# p5G4"65;;^>0>=;,D7Di;Di;(,V-8./,,,==8d,,,>2222  Dendritic and eutectic growth in Sb60Ag20Cu20 ternary alloy RUAN Ying & WEI BingBo Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072, China The rapid solidification of Sb60Ag20Cu20 ternary alloy was realized by high undercooling method, and the maximum undercooling is up to 142 K (0.18 TL). Within the wide undercooling range of 40 142 K, the solidified microstructures are composed of (Sb), ( and ( phases. High undercooling enlarges the solute solubility of (Sb) phase, which causes its crystal lattice to expand and its crystal lattice constants to increase. Primary (Sb) phase grows in two modes: at small undercoolings non-faceted dendrite growth is the main growth form; whereas at large undercoolings faceted dendrite growth takes the dominant place. The remarkable difference of crystal structures between (Sb) and ( phases leads to (( + Sb) pseudobinary eutectic hard to form, whereas strips of ( form when the alloy melt reaches the (( + Sb) pseudobinary eutectic line. The cooperative growth of ( and ( phases contributes to the formation of (( + () pseudobinary eutectic easily. In addition, the crystallization route has been determined via microstructural characteristic analysis and DSC experiment. high undercooling, ternary eutectic, crystal nucleation, dendrite growth Rapid crystal growth at high undercooling is a liquid/solid phase transition process deviating far from the equilibrium situation, which has been investigated widely to develop metal solidification mechanism and prepare novel metal materials[1 5]. It has been achieved by means of various containerless techniques, such as glass fluxing technique, drop tube technique and various kinds of levitation techniques[6 8]. Recently more attention has been attracted on the rapid crystal growth of undercooled ternary alloy. Sb-Ag-Cu ternary eutectic alloy system has a low eutectic transition temperature (699 K), whose solidification process involves the competitive nucleation and growth of several solid solutions and intermetallic compounds including faceted and nonfaceted phases. Faceted and non-faceted growth are two types of crystal growth. Faceted growth is realized by liquid phase atoms depositing on the steps of S/L interface which is flat on an atomic scale. The authors are grateful to Mr. Dai Fuping and Wang Haipeng for their contribution to experimental work. Kalb J, Spaepen F, Wuttig M. Atomic force microscopy measurements of crystal nucleation and growth rates in thin films of amorphous Te alloys. Appl Phys Lett, 2004, 84: 5240 5242 Yamauchi I, Kawamura H. Rapid solidification and mechanical alloying of Al-Co-Ag ternary alloys for skeletal silver cobalt synthesis. J Alloys Comp, 2004, 370: 137 143 Rosa C D, Park C, Thomas E L, et al. Microdomain patterns from directional eutectic solidification and epitaxy. Nature, 2000, 405: 433 437 Greven K, Ludwig A, Sahm P R. Time dependent interface stability during rapid solidification. J Appl Phys, 1999, 86: 3682 3687 Conti M. Curvature effects in rapid alloy solidification. Phys Rev E, 2001, 63: 041507 041514 Hermann R, Lser W. Extension of the primary solidification region of Nd2Fe14B by levitation of undercooled melts. J Appl Phys, 1998, 83: 6399 6401 Yao W J, Wei B. Rapid growth of nickel dendrite in highly undercooled Ni-Mo alloys. Sci China Ser E-Eng Mater Sci, 2003, 46(3): 259 267 Leonhardt M, Lser W, Lindenkreuz H G. Phase selection in undercooled peritectic Fe-Mo alloys. Acta Mater, 2002, 50: 725 734 Aoyama T, Paradis P, Ishikawa T, et al. Observation of rapid solidification of deeply undercoole!#%')+-.7;<=FGU`  - . B C D N Q   T z | s t   h#6o( jeh#6 jqh#6h#OJQJo( h#6 h#NHo( h#PJ h#PJo(h#H*OJQJh#CJ(PJ h#H*h# h#o(B=Ut>TR6F@,-/:01(d d`1v778     = > d e f g h k l  !"VZ[_gqst &*?@žžžŵh#mH sH h#mH o(sH  h#PJo( h#PJ h#PJo( h#NH h#NHo( jeh#6 h#6o( jqh#6h# h#o(D@APou`bNRTX$-2PQkm|}\]j(>\h#OJQJo(hpl h#NHo( h#5 h#NHh#H*OJQJo( h#H* h#o(h#M46<>pJLRT`dtx FHR\b ".4rt*,4V<>FX\jn68@Lh#CJmH sH  h#CJ h#H* h#NHh#OJQJo( h#o(h# h#CJo(OLPbfz,(,*,D,F,R,,,,,,,,---///X///////////00000$0.00080:0H0P0b0l00000001111X1Z1\1`1b1f1h1ӿʺӳjh#U h#>*o( h#o(h# h#CJH*h#OJQJo( h#CJo(h#CJNHU h#CJh#CJmH sH h#CJmH o(sH Cd Si melts using electrostatic levitation. Mat Sci Eng A, 2004, 375-377: 460 463 Dukiewicz J, Massalski T B. Search for metallic glasses at eutectic compositions in the Ag-Cu-Ge, Ag-Cu-Sb and Ag-Cu-Sb-Ge systems. Metall Trans A, 1981, 12A: 773 778 Ruan Y, Cao C D, Wei B. Rapid growth of ternary eutectic under high undercooling conditions. Sci China Ser G-Phys Mech Astron, 2004, 47(6): 717 728 Ruan Y, Wang N, Cao C D, et al. Rapid solidification mechanism of Ag60Sb34Cu6 ternary alloy in drop tube. Chin Sci Bull, 2004, 49(17): 1801 1805 Mikheev L V, Chernov A A. Mobility of a diffuse simple crystal-melt interface. J Cryst Growth, 1991, 112: 591 596    ? RUAN Ying et al. Sci China Ser G-Phys Mech Astron | June 2007 | vol. 50 | no. ? | ?-? RUAN Ying et al. Sci China Ser G-Phys Mech Astron | June 2007 | vol. 50 | no. 3 | ?-? ? Science in China Series G: Physics, Mechanics & Astronomy  2007 SCIENCE IN CHINA PRESS Springer  Received July 3, 2006; accepted November 27, 2006 doi: 10.1007/s11433-007-0055-5 Corresponding author (email: ruany HYPERLINK mailto:lmss@nwpu.edu.cn @nwpu.edu.cn) Supported by the National Natural Science Foundation of China (Grant Nos. 50121101 and 50395105) and the Doctorate Foundation of Northwestern Polytechnical University of China (Grant No. CX200419) www.scichina.com www.springerlink.com Sci China-Phys Mech Astron | Jun 2007 | vol. 50 | no. 3 | ?-? submit stencil 1X1Z1^1`1d1f1j1l1n1p1r1t1$2&222P3333$ d`a$ $d`a$ 9r % `  9r &` &dP<`h1t1v1x1111111111112222"2$2&2ҼsfsWsWG7h#CJOJQJ^JmH sH h#5CJOJQJ\^Jo(h#CJOJPJQJ^Jo(h#CJOJQJ^Jo("h#CJOJPJQJ^JnHtH#h#6CJOJPJQJ]^Jo(h#6CJOJQJ]^Jo((h#6CJOJPJQJ]^JnHtH+h#6CJOJPJQJ]^JnHo(tH.h#B*CJOJPJQJ]^JnHphtH#h#0J5CJOJQJ\^Jo(h#&2(2:2<2H2J2\2h2j2t2~22222222222222עǃttdRA=h#!h#CJOJQJ^JmH o(sH #h#0J5CJOJQJ\^Jo(h#5CJOJQJ\^Jo(h#CJOJPJQJ^Jo(h#CJOJQJ^Jo(#h#6CJOJPJQJ]^Jo((h#6CJOJPJQJ]^JnHtHh#6CJOJQJ]^Jo(h#CJOJQJ^JnHtH+h#6CJOJPJQJ]^JnHo(tH$h#6CJOJQJ]^JnHtH22233 3"3$3:3N3P3R3T3V3X3n3r3ԼvjRD;h#CJ^Jo(h#CJPJ^JnHtH.jh#6B*CJU^JmHnHphujh#CJU^J"jh#CJU^JmHnHu"jh#CJU^JmHnHu!h#6B*CJRHn^Jo(phh#6CJ]o( h#CJo(h#6CJ]h#6B*CJ^Jo(ph&h#6B*CJPJ^JnHphtH.jh#B*CJ U]^JmHnHphur33333333384l4n4p444444445555855555(6*6j66ƴrjajajWjah#CJNHaJh#CJaJo(h#CJaJjh#CJPJUjh#CJPJU h#CJH*h#CJPJh#CJPJo(h#OJQJmHnHo(u"jh#OJQJUmHnHuh#h#CJPJ^JnHtH h#o(h#nHtHh#CJ^Jo("h#CJOJPJQJ^JnHtH 3304n456r7t7v7x7z7|7~7777777777777 9r  `  9r ``d(666677&7*7,7.70767b7d7h7j7l7n7îtteteS<,h#0J5CJOJPJQJ\^JnHtH#h#0J5CJOJQJ\^Jo(h#CJOJPJQJ^Jo("h#CJOJPJQJ^JnHtH#h#6CJOJPJQJ]^Jo(+h#6CJOJPJQJ]^JnHo(tH(h#6CJOJPJQJ]^JnHtHh#CJOJQJ^Jo(.h#B*CJOJPJQJ]^JnHphtH.h#B*CJOJPJQJ]^JnHphtHn7p7r77888 8·ذ h#CJo(h#6CJ]aJ+h#56B*CJ0\]aJ0mH ph33sH h#h#CJOJPJQJ^Jo('h#0J5CJOJPJQJ\^Jo(777777777777777777777777777777777777777778888 8$ da$3 0182P. 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