Abstract
The age-hardening behavior of the Mg-1.9Zn(atomic fraction,%) alloy,morphologies of GP zones and temperature range of GP zone precipitation in the alloy were investigated by microhardness, XRD and TEM.The results show that the Zn atoms segregation occurs in the supersaturated solid solution,forming GP zones with different shapes during ageing process at 343 and 383 K;while at 423 K the age-hardening peak occurs earlier but no typical GP zone appeared.Using the thermodynamic parameters of the Mg-Zn system,the Gibbs free energy relations of the Mg-based solid solution phase were calculated,indicating the existences of the metastable miscibility gap and the solute atoms segregation in the super-saturated solid solution.With the reported data and the present experimental results,the ranges of composition and aging temperature for GP zone precipitation in the Mg-Zn alloy were determined.
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