Influence of deformation passes on interface of SiC_p/Al composites consolidated by equal channel angular pressing and torsion  

变形道次对基于等径角挤扭法制备的SiC_p/Al复合材料界面的影响（英文）

作　　者：钱陈豪[1] 李萍[1] 薛克敏[1] 

机构地区：[1]合肥工业大学材料科学与工程学院,合肥230009

出　　处：《Transactions of Nonferrous Metals Society of China》2015年第5期1376-1382,共7页中国有色金属学报（英文版）

基　　金：Project(51175138)supported by the National Natural Science Foundation of China;Projects(2012HGZX0030,2013HGCH0011)supported by the Fundamental Research Funds for the Central Universities,China;Project(20100111110003)supported by the Specialized Research Fund for the Doctoral Program of Higher Education,China

摘　　要：Powder mixture of pure Al and oxidized Si C was consolidated into 10%（mass fraction） Si Cp/Al composites at 250 °C by equal channel angular pressing and torsion（ECAP-T）. The valence states of Si for Si C particulates and Al for the as-consolidated composites were detected by X-ray photoelectron spectroscopy（XPS）. The interfacial bondings of the composites were characterized by scanning electron microscopy（SEM）. The elements at the interface were linearly scanned by energy dispersive spectroscopy（EDS） and the EDS mappings of Si and Al were also obtained. The values of the nanohardness at different positions within 2 μm from the boundary of Si C particulate were measured. The results show that after ECAP-T, interfacial reaction which inhibits injurious interfacial phase occurs between Al and the oxide layer of Si C, and the element interdiffusion which can enhance interfacial bonding exists between Al and Si C. As ECAP-T passes increase, the reaction degree is intensified and the element interdiffusion layer is thickened, leading to the more smooth transition of the hardness from Si C to Al.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。

关 键 词：metal matrix composites CONSOLIDATION DEFORMATION interfacial reaction element interdiffusion 

分 类 号：TB333[一般工业技术—材料科学与工程]