《Table 3 EDS results of the precipitated phase (wt%)》

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《轧前深冷处理对AZ31镁合金显微组织和力学性能的影响（英文）》

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Fig.1 shows the microstructures of as-cast AZ31magnesium alloy after different cryogenic treatments.Before cryogenic treatment，the volume of second-phase is relatively small and it shows a single form，as see in Fig.1a.A large number of second-phase particles precipitate in all the cryogenically treated samples，and the morphology of the particles are significantly altered.After cryogenic treatment for 12 h at-60°C，the homogeneous distribution of the precipitated phase in the matrix is obtained and the microstructure of AZ31 magnesium alloy consists ofα-Mg matrix and a substantial amount of precipitated second phase.The second phase in the microstructure mainly presents in two forms.The first form is larger in size with massive morphology（eutectic morphology），and the second form involves fine particulate or tiny laminar-shaped matter surrounding the first form（chiefly large precipitates）.To characterize these precipitates，energy spectrum analysis（EDS）was carried out.The chemical composition of the precipitated phase obtained is displayed in Table 3.These compounds are confirmed mainly by the decreased solubility of aluminum atoms in the Mg-matrix with the decrease in cryogenic temperature.This behavior induces the Mg-Al or Al-Mn alloy compound to form and precipitate.