利用分析电子显微镜(AEM)研究了磁控溅射法+真空热压方法制备的SiC纤维增强Ti-22Al-23Nb-2Ta(原子分数, %)合金复合材料的界面微结构. 该复合材料的纤维/合金界面由细晶粒的TiC+TiSi层、等轴晶TiC层和(Al, Ti)Nb2相层组成. 界面的形成主要是基体合金中的Ti元素与SiC纤维表面的C涂层直接反应生成TiC; 同时导致在次层形成贫Ti层和贫Ti层中Nb元素富集, 以致形成(Al, Ti)Nb2相.
The interfacial microstructure of SiC fibre reinforced Ti-22Al-23Nb-2Ta matrix composite, which was prepared by hot isostatic pressing (HIP) of power-clothed precursor wire, was investigated by analytical transmission electron microscopy (TEM). A new interfacial structure, consisting of fine grain TiC+TiSi, equiaxed TiC and （Al,Ti）Nb2 phase layer, was found at the fibre /matrix interface of the composite. A formation mechanism of the interface is proposed: the reaction of Ti with C-coating results in the formation of TiC; as a consequence, Nb is rich in Ti-depletion layer beneath TiC layer and forms (Al,Ti)Nb2 phase.
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