Abstract
The solidification paths of Al-Zn-Mg-Cu alloys and its precipitation behavior are analyzed using software package JMatPro 6.0 for material property simulation of Al-base alloys. The microstructures of the experimental alloys are analyzed; the experimental results of microstructural analysis are in agreement with the thermodynamic prediction. Through orthogonal experimental method, this paper designs the composition of Al-Zn-Mg-Cu alloys by studying the variation of η (MgZn2) phase, S (Al2CuMg) phase, T (AlZnMgCu) phase amount and precipitation temperatures with different Zn, Mg and Cu contents. It is found that with the optimum mass fraction of Zn of 6.7%, Mg of 2.2%–2.5% and Cu of 1.6%–2.0%, the mass fraction of η phase can be up to 8.7%–9.22% and that of S phase and T phase can be lower than 0.5%.
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Yu, Jj., Li, Xm. & Yu, Xq. Thermodynamic analyse on equilibrium precipitation phases and composition design of Al-Zn-Mg-Cu alloys. J. Shanghai Jiaotong Univ. (Sci.) 17, 286–290 (2012). https://doi.org/10.1007/s12204-012-1270-4
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DOI: https://doi.org/10.1007/s12204-012-1270-4