Abstract
In this study, a high-performance Mg-3Nd-3Gd-0.2Zn-0.5Zr alloy is prepared. The precipitate microstructures of the studied alloy during isothermal aging at 225 °C are characterized by HAADF-STEM observations, and the corresponding mechanical properties are also investigated. It is noted that the evolution of the precipitate microstructure is mainly divided into three stages: the precipitation and growth of β″, the transition from β″ to β1, and the ripening of β1. There are apparent differences in the mechanical properties of alloy in these three stages. At the beginning of aging treatment, due to the precipitation and growth of β″, the yield strength of alloy increases rapidly while the elongation decreases. Afterwards, the transition of precipitates from β″ to β1 leads to the simultaneous increment in the yield strength and elongation of the alloy. Finally, as the β1 precipitates ripen, the yield strength of the alloy decreases while its elongation shows a trend of increment owing to the significantly improved dimensions and reduced number density.
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