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采用透射电子显微技术及高分辨技术，对Ｃ／Ｍｇ复合材料界面的显微结构进行了研究，发现在纤维与基体的界面上存在着Ａｌ元素的偏聚；碳纤维的石墨化程度不同，界面形态不同：石墨化程度较低时，界面处有一层约１μｍ厚的细晶粒层存在，石墨化程度较高时，界面处平直光滑；界面处有析出物γ－Ｍｇ１７Ａｌ１２存在；近界面区存在着大量晶体缺陷，主要为位错和孪晶，并有残余应变层存在；当碳纤维表面有ＳｉＣ涂层时，在涂层与基体间将形成在界面结合中起着重要作用的过渡层。
The microstructure of the interface of C / Mg composites was studied by transmission electron microscopy and high-resolution technique. It was found that the segregation of Al elements existed at the interface between the fibers and matrix. The degree of graphitization of carbon fibers was different. The interface Different morphology: When the degree of graphitization is low, there is a layer of fine grained layer about 1μm thick at the interface. When the degree of graphitization is high, the interface is smooth and smooth. Precipitates γ-Mg17Al12 exist in the interface; There are a large number of crystal defects, mainly dislocations and twins, and there are residual strained layers. When there is a SiC coating on the surface of the carbon fiber, a transition layer that plays an important role in interfacial bonding will form between the coating and the substrate.