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采用光学显微镜和场发射扫描电镜,研究超声波对原位Mg2Si/Al复合材料中初生Mg2Si形态的影响。研究结果表明:超声波处理使初生Mg2Si的晶粒尺寸从150μm降低到20μm,初生Mg2Si形态发生改变。在二维形貌中,未实施超声波振动处理的初生Mg2Si晶粒生长为含有空腔的粗大颗粒,共晶组织生长于其中,相应的三维形态为含有漏斗状空腔的八面体和十四面体。超声波处理后的初生Mg2Si晶粒变成细小、实心三维形态的颗粒,颗粒棱角已发生钝化效应。
The effects of ultrasonic wave on the morphology of primary Mg2Si in situ Mg2Si / Al composites were studied by optical microscopy and field emission scanning electron microscopy. The results show that the morphology of primary Mg2Si changes after the ultrasonic treatment reduces the grain size of primary Mg2Si from 150μm to 20μm. In the two-dimensional topography, primary Mg2Si grains without ultrasonic vibration treatment grow into coarse grains with cavities, and eutectic structure grows in them. The corresponding three-dimensional shape is octahedron and fourteen facets containing funnel-shaped cavities body. Ultrasonic treatment of the primary Mg2Si grains into small, solid three-dimensional shape of the particles, the corner has been the role of passivation effect.