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中文摘要：
为研究均匀化退火处理对Mg-3Al-1Zn-2．2／5Sr镁合金中第二相的影响，通过x射线衍射分析（XRD）、扫描电镜观察（SEM）和能谱分析（EDS）等手段，并结合Pandat热力学计算软件，对Mg-3Al-1Zn-2．2／5Sr镁合金均匀化退火后组织中的第二相的类型及形成原因进行了分析。结果表明：经过400℃，15h（炉冷）的均匀化退火处理以后，合金铸态组织中原本存在的（Mg，Al）17Sr2相中固溶的Al元素所占原子分数有所降低。此外，Sr含量为2．2％（质量分数）的合金组织中可以观察到大量沿（Mg，Al）17Sr2相边缘分布的颗粒状Al4Sr相，而Sr含量为5％的合金中基本观察不到（Mg，Al）17Sr2相的变化。
英文摘要：
In order to investigate the effect of homogenization annealing on the second phases of Mg-3Al-1Zn-2.2/SSr magnesium alloys, the type and formation theory of second phases in the as-annealed Mg-3Al-1Zn-2.2/SSr alloys were investigated by scanning electron microscope （SEM）, energy dispersive spectrometer （EDS） and X-ray diffractometer （XRD） combined with Pandat thermodynamic calculation software. The results indicate that after homogenization annealing at 400 ℃ for 15 h and cooling in furnace, the fraction volume of Al in （Mg, Al）lvSr2 phase preliminarily formed in the as-cast structure of Mg-3Al-1Zn-2.2/5Sr alloys decreases slightly. In addition, a huge number of granular A14Sr phases are formed along the edge of the （Mg, Al）17Sr2 phase in Mg-3AI-IZn-2.2Sr alloy, while the change of （Mg, Al）17Sr2 is hardly to be observed in the microstructure of the alloy with 5% Sr addition.
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