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通过金相、扫描电镜(SEM)、X射线衍射分析(XRD)和差热分析(DSC)等手段,研究Sb变质对Mg-6Al-1Zn-0.7Si镁合金热处理组织和力学性能的影响,尤其是对合金固溶处理组织的影响。结果表明:固溶处理可以变质Mg-6Al-1Zn-0.7Si镁合金铸态组织中的汉字状Mg2Si相,使Mg2Si相从汉字状变为短杆状和条块状,并且添加0.4%Sb到实验合金中可使固溶处理变质汉字状Mg2Si相的效果提高。也正是由于固溶处理可以使实验合金组织中的汉字状Mg2Si相变质,使得Mg-6A1-1Zn-0.7Si合金时效处理后获得了较铸态更高的的抗拉性能和抗蠕变性能,并且添加0.4%Sb可以进一步增强热处理对性能的改善作用。
The effect of Sb modification on the microstructure and mechanical properties of Mg-6Al-1Zn-0.7Si magnesium alloy was studied by means of metallographic examination, scanning electron microscopy (SEM), X-ray diffraction analysis (XRD) and differential scanning calorimetry (DSC) It is the effect of the alloy solution treatment organization. The results show that the solution treatment can deform the Chinese character Mg2Si phase in the as-cast microstructure of Mg-6Al-1Zn-0.7Si magnesium alloy, and change the Mg2Si phase from Chinese character to short rod and bar, and add 0.4% Sb to The experimental alloy can improve the effect of solution treatment of the Chinese character Mg2Si. It is also due to the solution treatment can make the experimental alloy microstructure of Chinese-shaped Mg2Si phase change, making the Mg-6A1-1Zn-0.7Si alloy obtained after the aging of the as-cast higher tensile properties and creep resistance , And adding 0.4% Sb can further enhance the heat treatment on the performance improvement.