Acta Metall Sin  2008, Vol. 44 Issue (10): 1175-1182     DOI:

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MODELING OF DENDRITIC STRUCTURE AND MICROSEGREGATION IN SOLIDIFICATION OF AL-RICH QUATERNARY ALLOYS

Dai Ting;Mingfang ZHU;Shuanglin CHEN;Weisheng CAO;Chunpyo HONG

东南大学材料科学与工程学院

Dai Ting; Mingfang ZHU; Shuanglin CHEN; Weisheng CAO; Chunpyo HONG. MODELING OF DENDRITIC STRUCTURE AND MICROSEGREGATION IN SOLIDIFICATION OF AL-RICH QUATERNARY ALLOYS. Acta Metall Sin, 2008, 44(10): 1175-1182 .

Abstract References Related Articles Recommended Metrics Download:  PDF(5080KB)  Export:  BibTeX | EndNote (RIS)       Abstract  A two-dimensional (2-D) coupled cellular automaton (CA)-PanEngine model is developed for the simulation of dendritic growth and microsegregation formation in solidification of quaternary alloy system. In the model, the CA approach is employed to describe dendritic growth. The dynamics of dendritic growth is calculated according to the difference between the local equilibrium liquidus temperature and local actual temperature, incorporating with the Gibbs–Thomson effect. Based on the local liquid compositions of three solutes, which are determined by solving the solutal transport equation in the domain, the local equilibrium liquidus temperature and equilibrium solid concentrations of three solutes at the solid/liquid (SL) interface are evaluated with the aid of a thermodynamic phase equilibrium calculation package PanEngine. To reduce computation time, a data tabulation coupling strategy between CA and PanEngine is adopted. The model is validated through the comparisons of simulated results with the predictions of the Scheil model and the equilibrium model for the evolution of solid fraction with the decrease of temperature and for the solid composition profiles as a function of solid fraction in an Al-4.5wt%Cu-0.5wt%Mg-1wt%Si alloy. It is demonstrated that the present model can be used to simulate the evolution of dendritic growth morphology and to quantitatively predict the microsegregation patterns in solidification of quaternary Al-rich alloys. Key words:        Received:  18 February 2008      ZTFLH:  TG244   Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors Dai Ting Mingfang ZHU Shuanglin CHEN Weisheng CAO Chunpyo HONG URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y2008/V44/I10/1175 [1]Hecht U,Granasy L,Pusztai T,Bottger B,Apel M,Wi- tusiewicz V,Ratke L,De Wilde J,Froyen L,Camel D, Drevet B,Faivre G,Fries S G,Legendre B,Rex S.Mater Sci Eng,2004;R46:1 [2]Xie F Y,Kraft T,Zuo Y,Moon C H,Chang Y A.Acta Mater,1999;47:489 [3]Yan X,Chen S,Xie F,Chang Y A.Acta Mater,2002;50: 2199 [4]Xie F Y,Yan X Y,Ding L,Zhang F,Chen S L,Chu M G,Chang Y A.Mater Sci Eng,2003;A355:144 [5]Ohsasa K,Nakaue S,Kudoh M,Narita T.ISIJ Int,1995; 35:629 [6]Ode M,Lee J S,Kim S G,Kim W T,Suzuki T.ISIJ Int, 2000;40:870 [7]Kobayashi H,Ode M,Kim S G,Kim W T,Suzuki T.Scr Mater,2003;48:689 [8]Grafe U,Bottger B,Tiaden J,Fries S G.Scr Mater,2000; 42:1179 [9]Cha P R,Yeon D H,Yoon J K.Acta Mater,2001;49: 3295 [10]Zhang R J,Jing T,Jie W Q,Liu B C.Acta Mater,2006; 54:2235 [11]Jacot A,Rappaz M.Acta Mater,2002;50:1909 [12]Jarvis D J,Brown S G R,Spittle J A.Mater Sci Technol, 2000;16:1420 [13]Lee P D,Chirazi A,Atwood R C,Wang W.Mater Sci Eng,2004;A365:57 [14]Miettinen J.Metall Mater Trans,2000;31B:365 [15]Bottger B,Grafe U,Ma D,Fries S G.Mater Sci Technol, 2000;16:1425 [16]Yang B J,Stefanescu D M,Leon-Torres J.Metall Mater Trans,2001;32A:3065 [17]Nastac L.Acta Mater,1999;47:4253 [18]Zhu M F,Hong C P.ISIJ Int,2001;41:436 [19]Wang W,Lee P D,McLean M.Acta Mater,2003;51:2971 [20]Yu J,Xu Q Y,Cui K,Liu B C.Acta Metall Sin,2007;43: 731 (于靖，许庆彦，崔锴，柳百成．金属学报，2007；43：731) [21]Belteran-Sanchez L,Stefanescu D M.Metall Mater Trans, 2004;35A:2471 [22]Zhu M F,Chert S L,Xie F Y,Hong C P,Chang Y A.Trans Nonferrous Metals Soc China,2006;16(Suppl.2):s180 [23]Zhu M F,Cao W,Chen S L,Hong C P,Chang Y A.J Phase Equilib Diffus,2007;28:130 [24]Chen S L,Daniel S,Zhang F,Chang Y A,Yan X Y,Xie F Y,Schrnid-Fetzer R,Oates W A.Calphad,2002;26:175 [25]Wheeler A A,Boettinger W J,McFadden G B.Phys Rev, 1992;45A:7424 [26]Gránásy L,Pusztai T,Warren J A,Douglas J F,B(?)rzs(?)nyi T,Ferreiro V.Nature Mater,2003;2:92 [27]Brandes E A,Brook G B.Smithells Metals Reference Book.7 Ed.,Berlin:Butterworth-Heinemann Publishing, 1997:1794 [28]Ramirez J C,Beckermann C.Acta Mater,2005;53:1721 [29]Shin Y H,Hong C P.ISIJ Int,2002;42:359 [30]Boettinger W J,Warren J A,Beckermann C,Karma A. 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