A UNIFIED ANALYTICAL MODEL FOR THE PRIMARY SOLIDIFICATION PATH IN TERNARY ALLOYS

doi:10.3724/SP.J.1037.2011.00195

Acta Metall Sin

2011, Vol. 47

Issue (9): 1135-1140 DOI: 10.3724/SP.J.1037.2011.00195

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A UNIFIED ANALYTICAL MODEL FOR THE PRIMARY SOLIDIFICATION PATH IN TERNARY ALLOYS

ZHAO Guangwei, LI Xinzhong, XU Daming, FU Hengzhi, DU Yong, HE Yuehui

1) School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001
2) State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083

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ZHAO Guangwei LI Xinzhong XU Daming FU Hengzhi DU Yong HE Yuehui. A UNIFIED ANALYTICAL MODEL FOR THE PRIMARY SOLIDIFICATION PATH IN TERNARY ALLOYS. Acta Metall Sin, 2011, 47(9): 1135-1140.

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Abstract Accurate prediction for the solidification path of a multicomponent alloy and the amounts of the secondary phases presented under a given solidification condition is critical in understanding and controlling the performances of the solidified alloy materials/parts. The degree of freedom of a single-phase solidification in multicomponent alloys is at least more than one, whilch brings some difficulty in accurate predicting of the solidification path. A new analytical model for predicting a single-phase solidification paths in ternary alloys was developed based on a previously proposed unified microsegregation model for dendrite solidification of binary alloys. The present unified analytical model can not only include the three limiting solidification conditions of equilibrium, nonequilibrium and paraequilibrium solidification, but also take into account of any solid diffusion coefficient, dendrite geometrical morphologies and solidification rates, etc. The algorithms for calculating the solidification paths of ternary alloys was closely coupled with a commercial software package/database of Thermo-Calc via its TQ6-interface in order to directly access to the thermodynamic data. The availability of the proposed analytical model for predicting the primary solidification paths of ternary alloys were demonstrated by the sample computations on Al-1.0Cu-6.3Mg, Al-1.49Si-0.64Mg and Al-1.49Si-2.90Mg alloys under different solidification conditions of solid back diffusion. It was found that the solidification conditions affect the solidification paths significantly. For an alloy, especially with a nominal composition far away from the ternary eutectic point, different solid back diffusion conditions and solidification rate can result in different amounts and even different kinds of secondary phase.

Key words: ternary alloy solidification path microsegregation analytical model

Received: 02 April 2011

Fund:

Supported by National Natural Science Foundation of China (Nos.50771041 and 50801019), National Basic Research Program of China
(No.2011CB610406) and Open Project of State Key Laboratory of Powder Metallurgy of Central South University (No.2008112042)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2011.00195 OR https://www.ams.org.cn/EN/Y2011/V47/I9/1135

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