Abstract：Thermodynamic study of the Cu-Mg-Y system serve as the foundation for constructing the Al-Cu-Mg-Y quaternary database, designing long-period stacking ordered (LPSO) strengthened Mg alloys, and optimizing the glass-forming ability (GFA) of Mg-based amorphous alloys. Based on literature data, the present work re-optimized the thermodynamic parameters of the Cu-Mg-Y system using the calculation of phase diagram (CALPHAD) method. The substitutional solution model was employed to describe the liquid phase, and a general model for LPSO structures was adopted to characterize the τ11 phase (14H). The calculated isothermal sections at 673, 573, and 723 K, vertical sections at 17.2% Cu, 7.2% Y, and 10% Y (mole fraction), as well as the liquidus projection, all agree well with experimental data. At 673 K, the solubility of Y in the τ11 phase ranges from 7.96% to 8.69% (mole fraction), and the invariant reaction Liquid+αMg↔τ11+CuMg2 is determined to occur at 715 K. Furthermore, Scheil non-equilibrium solidification simulations were carried out for two typical high-GFA alloys, Cu12.8Mg80.4Y6.8 and Cu36.9Mg55.6Y7.5 (mole fraction, %), clarifying their solidification paths and phase precipitation behavior, and providing a thermodynamic basis for the compositional design of alloys in this system.
颜景哲, 刘树红, 杜勇. Cu-Mg-Y体系的相图热力学研究[J]. 粉末冶金材料科学与工程, 2026, 31(4): 321-332.
YAN Jingzhe, LIU Shuhong, DU Yong. Thermodynamic study of the Cu-Mg-Y system[J]. Materials Science and Engineering of Powder Metallurgy, 2026, 31(4): 321-332.
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