Phase equilibria, calorimetric study and thermodynamic modeling of Mg-Li-Ca alloys

被引:29
作者
Gröbner, J
Schmid-Fetzer, R
Pisch, A
Colinet, C
Pavlyuk, VV
Dmytriv, GS
Kevorkov, DG
Bodak, OI
机构
[1] Tech Univ Clausthal, Inst Met, D-38678 Clausthal Zellerfeld, Germany
[2] Domaine Univ, CNRS INPG UJF, UMR 5614, Lab Thermodynam & Phys Chim Met, F-38402 St Martin Dheres, France
[3] Ivan Franko Lviv Natl Univ, Dept Inorgan Chem, UA-79005 Lvov, Ukraine
关键词
magnesium; Ca-Li; calorimetry; thermodynamics; phase diagram;
D O I
10.1016/S0040-6031(01)00842-5
中图分类号
O414.1 [热力学];
学科分类号
摘要
The binary Ca-Li and the ternary Ca-Li-Mg systems were studied experimentally by calorimetry and phase equilibration and also by thermodynamic calculations using the Calphad method. The enthalpy of formation of the binary phase CaLi2 was investigated by drop solution calorimetry in a liquid aluminum bath. Ternary phase equilibria at 150 degreesC were studied with 54 different alloys annealed for 400 h and analyzed by X-ray diffractometry. A thermodynamic assessment of the binary Ca-Li system was performed. All available experimental data agree with the calculation in the binary Ca-Li system. In the ternary Ca-Li-Mg system, a complete ternary solubility of CaMg2 and CaLi2 at 150 degreesC was found. For this Ca(Li,Mg)(2) solution phase, a thermodynamic interaction parameter was assessed. Based on the present thermodynamic datasets and those of the binaries CaMg and Li-Mg from literature, the phase equilibria in the entire ternary system were calculated. Isothermal and vertical sections of the phase diagram and the projection of the liquidus surface are shown. These calculated phase diagrams are well supported by the experimental data. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:85 / 94
页数:10
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