论文信息 - Precipitation hardening in Mg-Ca-Zn alloys

Precipitation hardening in Mg-Ca-Zn alloys

Based on thermodynamic calculations, four alloys in the system Mg-Ca-Zn produced by gravity die casting were solution treated and aged at 175 °C for different times. The scanning electron microscopy and X-ray diffraction analyses of the solutionized alloys were in good agreement with the thermodynamic calculations. In these Mg-Ca-Zn alloys, the hardness increases with aging time up to 8 hours followed by typical overaging, during which the hardness decreases. According to the calculations and scanning transmission electron microscopy analyses, the change in the hardness can be correlated to the precipitation of Ca2Mg6Zn3.

[1] J. B. Sande,et al. Precipitate Crystal Structure Determination in Melt Spun Mg-1.5wt%Ca-6wt%Zn Alloy , 2002, Microscopy and Microanalysis.

[2] T. Larionova,et al. A ternary phase observed in rapidly solidified Mg–Ca–Zn alloys , 2001 .

[3] J. Gröbner,et al. Experimental investigation and thermodynamic calculation of ternary Al-Ca-Mg phase equilibria , 2003 .

[4] B. Muddle,et al. Precipitation hardening of Mg-Ca(-Zn) alloys , 1997 .

[5] David B. Williams,et al. Quantitative X-Ray Microanalysis in the Analytical Electron Microscope , 1991 .

[6] Zi-kui Liu,et al. A computational thermodynamic model of the Ca–Mg–Zn system , 2004 .

[7] J. Gröbner,et al. Experimental study of ternary Ca–Mg–Si phase equilibria and thermodynamic assessment of Ca–Si and Ca–Mg–Si systems , 2003 .

[8] Shuang-Tin Chen,et al. A thermodynamic description of the Al-Mg-Zn system , 1997 .

[9] Robert E. Reed-Hill,et al. Physical Metallurgy Principles , 1972 .

[10] J. B. Vander Sande,et al. Second phase formation in melt-spun Mg–Ca–Zn alloys , 2004 .