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采用X射线衍射仪、X射线光电子能谱仪、扫描电子显微镜和透射电子显微镜对萃取Mg2B2O5w的物相、表面元素化学状态变化及Mg2B2O5w/AZ91D复合材料界面反应产物进行了研究。结果表明:Mg2B2O5w/AZ91D界面处存在厚度不均匀的MgO和MgB2相界面层;MgO的形成主要与复合材料制备过程中晶须表面上的吸附氧有关,而界面产物MgB2则应来源于Mg2B2O5w分解产物B2O3与基体中Mg的反应;Mg2B2O5w、MgO和MgB2之间通常没有确定的晶体学位相关系,但在特定Mg2B2O5w表面观察到(202)Mg2B2O5w//(002)MgO,[010]Mg2B2O5w//[110]MgO和(002)MgO//(0001)MgB2,[110]MgO//[21 10]MgB2取向关系。
The phase of Mg2B2O5w, the chemical changes of the surface elements and the interfacial reaction products of Mg2B2O5w / AZ91D composite were investigated by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy and transmission electron microscopy. The results show that the interface layer of MgO and MgB2 with non-uniform thickness exists at the interface of Mg2B2O5w / AZ91D. The formation of MgO is mainly related to the adsorption of oxygen on the surface of the whisker during the preparation of the composites, while the interface product MgB2 should originate from the decomposition of Mg2B2O5w B2O3 reaction with Mg in the matrix; there is usually no definite relationship between Mg2B2O5w, MgO and MgB2, but (202) Mg2B2O5w // (002) MgO, [010] Mg2B2O5w // [110 ] MgO and (002) MgO // (0001) MgB2, [110] MgO // [21 10] MgB2.