| Thermodynamic modeling of the La-Mg-Y system and Mg-based alloys database |
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| 作者姓名： | DU Zhenmin GUO Cuiping LI Changrong ZHANG Weijing |
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| 作者单位： | Department of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China |
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| 摘 要： | As an example of the La-Mg-Y system, the method how to set up the themaodynamic model of individual phases was introduced in the process of thermodynamic optimization. The solution phases （liquid, body-centered cubic, face-centered cubic, hexagonal close-packed and double hexagonal close-packed） were modeled with the Redlich-Kister equation. The compound energy model has been used to describe the thermodynamic functions of the intermetallic compounds in the La-Mg-Y systems. The compounds Mg2Y, Mg24Y5, Mg12La, Mg17La2, Mg41Las, Mg3La and Mg2La in the La-Mg-Y system were treated as the formulae （Mg,Y）2（La,Mg,Y）, Mg24（La,Mg,Y）4Y, Mg12（La, Y）, Mg17（La,Y）2, Mg41（La,Y）5, Mg3（La,Mg,Y） and Mg2（La, Y）, respectively. A model （La, Mg,Y）0.5（La,Mg,Y）0.5 was applied to describe the compound MgM formed by MgLa and MgY in order to cope with the order-disorder transition between body-centered cubic solution （A2） and MgM with CsCl-type structure （B2） in the La-Mg-Y system. The Gibbs energies of individual phases were optimized in the La-Mg, La-Y and La-Mg-Y systems by CALPHAD technique. The projection of the liquidus surfaces for the La-Mg-Y system was predicted. The Mg-based alloys database including 36 binary and 15 ternary systems formed by Mg, Al, Cu, Ni, Mn, Zn and rare earth elements was set up in SGTE standard.
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| 关 键 词： | 镧-镁-钇系统 热力学模型 CALPHAD方法 有序-无序转换 镁基合金 |
| 收稿时间： | 2006-06-20 |
Thermodynamic modeling of the La-Mg-Y system and Mg-based alloys database |
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| DU Zhenmin GUO Cuiping LI Changrong ZHANG Weijing.Thermodynamic modeling of the La-Mg-Y system and Mg-based alloys database[J].Rare Metals,2006,25(5):492-500. |
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| Authors: | DU Zhenmin GUO Cuiping LI Changrong ZHANG Weijing |
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| Affiliation: | 1. National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, 800 Dongchuan Road, 200240 Shanghai, PR China;2. CompuTherm LLC, 437 S. Yellowstone Dr., Ste 217, Madison, WI 53719, USA;1. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, 16802, USA;2. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China |
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| Abstract: | As an example of the La-Mg-Y system, the method how to set up the thermodynamic model of individual phases was introduced in the process of thermodynamic optimization. The solution phases (liquid, body-centered cubic, face-centered cubic, hexagonal close-packed and double hexagonal close-packed) were modeled with the Redlich-Kister equation. The compound energy model has been used to describe the thermodynamic functions of the intermetallic com- pounds in the La-Mg-Y systems. The compounds Mg2Y, Mg24Y5, Mg12La, Mg17La2, Mg41La5, Mg3La and Mg2La in the La-Mg-Y system were treated as the formulae (Mg,Y)2(La,Mg,Y), Mg24(La,Mg,Y)4Y, Mg12(La,Y), Mg17(La,Y)2, Mg41(La,Y)5, Mg3(La,Mg,Y) and Mg2(La,Y), respectively. A model (La,Mg,Y)0.5(La,Mg,Y)0.5 was applied to describe the compound MgM formed by MgLa and MgY in order to cope with the order-disorder transition between body-centered cu- bic solution (A2) and MgM with CsCl-type structure (B2) in the La-Mg-Y system. The Gibbs energies of individual phases were optimized in the La-Mg, La-Y and La-Mg-Y systems by CALPHAD technique. The projection of the liquidus sur- faces for the La-Mg-Y system was predicted. The Mg-based alloys database including 36 binary and 15 ternary systems formed by Mg, Al, Cu, Ni, Mn, Zn and rare earth elements was set up in SGTE standard. |
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| Keywords: | La-Mg-Y system thermodynamic modeling CALPHAD technique order-disorder transition Mg-based alloys database |
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