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在250°C下,利用等径角挤扭变形工艺(ECAP-T)将纯Al和经氧化处理的Si C混合粉末固结成10%Si Cp/Al复合材料。采用X射线光电子能谱仪(XPS)测定SiC颗粒氧化处理前后Si元素的价态以及固结后复合材料中Al元素的价态,通过扫描电镜(SEM)对复合材料的界面进行观察,并利用能谱仪(EDS)对界面结合处进行元素线扫描和面扫描,最后对复合材料界面进行纳米硬度的测量。结果表明,ECAP-T变形后,Al和Si C的氧化层之间发生了界面反应,抑制了有害界面相的产生,并产生了基体和增强体之间的元素互扩散;随着ECAP-T变形道次的增加,界面反应程度加剧,元素扩散层加厚,使复合材料从增强体到基体的硬度过渡更加平缓。
At 250 ° C, pure Al and oxidized Si C powders were consolidated into 10% Si Cp / Al composites by ECAP-T. X-ray photoelectron spectroscopy (XPS) was used to determine the valence of Si elements before and after oxidation of SiC particles and the valence of Al elements in the composites after the oxidation. The interface of the composites was observed by scanning electron microscopy (SEM) EDS (Scanning Electron Spectroscopy) element line scanning and surface scanning were performed on the interface, and finally the nano-hardness of the composite interface was measured. The results show that after the ECAP-T deformation, an interfacial reaction occurs between the oxide layers of Al and Si C, the detrimental interfacial phase is inhibited, and the inter-elemental diffusion between the matrix and the reinforcing body occurs. With the ECAP-T Deformation path increases, the degree of interfacial reaction intensifies, element diffusion layer thickening, the composite material from the reinforcement to the matrix hardness transition more smoothly.