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SECONDARY ARM SPACING OF UNDERCOOLED Ni_(50)Cu_(50) ALLOY |
LI Jinfu; LU Yili; YANG Gencang; ZHOU Yaohe(State Key Laboratory of Solidification Processing; Northwestern Polytechnical University; Xi'an 710072)Comspondent: LI Jinfu; associate professor; Fax:(029)8491000 Tel: (029)8492374E-mail: Gencangy nmpu.edu.cn. |
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Cite this article:
LI Jinfu; LU Yili; YANG Gencang; ZHOU Yaohe(State Key Laboratory of Solidification Processing; Northwestern Polytechnical University; Xi'an 710072)Comspondent: LI Jinfu; associate professor; Fax:(029)8491000 Tel: (029)8492374E-mail: Gencangy nmpu.edu.cn.. SECONDARY ARM SPACING OF UNDERCOOLED Ni_(50)Cu_(50) ALLOY. Acta Metall Sin, 1998, 34(6): 586-590.
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Abstract The secondary arm spacing of undercooled Ni50Cu50 alloy did not decrease withincreasing undercooling in a simple power law, but there was a abnormal protrusion in theirrelationship in the undercooling range of 40 -- 120 K. This phenomenon was first attributedto the increase of primary dendrite tip radius occurring in the transition from solute diffusioncontrolled dendrite growth at low undercoolings to thermally controlled dendrite growth at highundercoolings. The other cause was the substantial sidebranch coarsing induced by the remeltingwhich was extremely serious in the solidification of undercooled melts.
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Received: 18 June 1998
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1 Fleming S M C, Shiohara Y Mater Set Eng, 1984 65: 157 2 Boettinger W J,Coriell S R ,Trivedi R .In :Mehrabian R ,Parrish P A eds Papid Solidification Processing Princeiples and Technologies IV ,Baton Rouge LA: Claitor's Publishing 1988: 13 3 Li Jinfu, Lu Yili, Yang Gencang, Zhou Yaohe. Prog Nat Sci, 1997 7: 736 4 李金富,杨根仓,周尧和 金属学报,1998:34:113(Li J F, Yang G C, Zhou Y H. Acta Metall Sin, 1998; 34: 113 5 Langer J S, Muller-Krumbhaar H. Acta Metall, 1978; 26: 1681 6 Ivantsov G P. Dokl Adad Naud SSSR, 1947; 58: 5677 Trivedi R,Kurz W.Acta Metall ,19862 34:1663 8 Aziz M J.J Appl Phys, 1982; 53: 1158 9 Huang S C, Glicksman M E. Acta Metall, 1981; 29: 717 10Liu L X, Kirkaldy J S Scr Metall Mater ,1993; 28: 1029 |
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