Abstract
In this work, the evolution process, crystallinity, microstructure and morphology of Mg-9Gd-2Y-0.5Zn-0.5Zr (wt%) alloy precipitates were analyzed during isothermal aging at 200 ℃. During the early stages of aging, the precipitate phase distributed in the matrix is mainly the β′′ phase, which exhibits a hexagonal D019 structure. In the peak-aged stage, the γ′′ phase, LPSO phase, and β′ of the precipitates coexist in the matrix. The synergism between the three types of phases is significant with respect to the improved age-hardening. We propose that the optimized mechanical properties of the alloy originate from the co-precipitation of the LPSO, β′, and γ'' phases. Furthermore, it is an important way to improve the performance of the alloy at high temperatures.
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