Phase diagram determination and thermodynamic modeling of the Cu-Mg-Si system

J. Min. Metall. Sect. B-Metall. 52 (1) B (2016) 99-112. DOI:10.2298/JMMB150515009Z
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13 ternary Cu-Mg-Si alloys were prepared by means of the powder metallurgy method. Phase equilibria at 500 and 700 oC of the Cu-Mg-Si system were determined using X-ray diffraction analysis (XRD). The existence of 3 ternary compounds in this system was verified: CuMgSi_Sigma (Cu16Mg6Si7), Tau (Cu3Mg2Si), and Laves ((Cu0.8Si0.2)2(Mg0.88Cu0.12)). A thermodynamic modeling for the Cu-Mg-Si system was then conducted on the basis of the experimental data obtained in this work and those critically reviewed from the literature. The complex phase relationship between Laves phase and other phases has been successfully modeled in this work. Comparisons between the calculated and the measured phase diagrams show that most of the experimental data can be reproduced by the presently obtained thermodynamic parameters.
Keywords: Cu-Mg-Si system, XRD analysis, thermodynamic calculation, isothermal section, liquidus projection
Correspondence Address:
J. Zhao, Shandong Academy of Sciences, Advanced Materials Institute, Shandong Key
Laboratory for High Strength Lightweight Metallic Materials (HLM), Shandong Engineering
Research Center for Lightweight Automobiles Magnesium Alloy, Jipan, China,
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