SiC/Al复合材料的显微组织与界面研究  

Study on Microstructure and Interface of SiC/Al Composites

作　　者：刘园 崔岩 周圣杰 杨越 曹雷刚 LIU Yuan;CUI Yan;ZHOU Shengjie;YANG Yue;CAO Leigang(School of Mechanical and Materials Engineering,North China University of Technology,Beijing 100144,China)

机构地区：[1]北方工业大学机械与材料工程学院,北京100144

出　　处：《热加工工艺》2023年第18期57-60,共4页Hot Working Technology

基　　金：国家自然科学基金项目(51801002);北京市教育委员会科技计划一般项目(KM202010009004)。

摘　　要：通过无压浸渗工艺制备了体积分数为45vol%,颗粒粒径为80μm的SiC/Al复合材料,利用金相显微镜、扫描电子显微镜观察复合材料的显微组织。结果表明,SiC/Al复合材料中可观察到增强相颗粒在基体中均匀分布,局部组织中存在孔隙和界面结合不良的情况。基体中的Si元素会以共晶Si的形式析出;C元素分布较为均匀,主要是参与了和Al基体的界面反应;基体中存在Mg和Si的富集区域,主要是由于浸渗过程中析出了Mg2Si相;近界面处存在富Mg和O的反应产物,复合材料中各种组织和相的存在均会影响材料的力学性能。SiC/Al composites with volume fraction of 45vo1%and particle size of 80μm were prepared by pressureless infiltration process.The microstructure of SiC/Al composites was observed by optical microscope and scanning electron microscope.The results show that the uniform distribution of enhanced phase particles in the matrix is observed in the SiC/Al composite,and there is poor pore and interface binding in the local microstructure.The Si elements in the matrix emerge in the form of cocrystalline Si.The C elements are relatively evenly distributed,mainly involved in the interfacial reaction with the Al matrix.Enriched regions of Mg and Si are present in the matrix,it is mainly due to the Mg2Si phase precipitated during the infiltration process.Mg and O-rich reaction products exist near the interface,and the presence of various microstructure and phases in the composite affects the mechanical properties of the material.

关 键 词：SIC/AL复合材料 无压浸渗 微观组织 界面 

分 类 号：TB333.12[一般工业技术—材料科学与工程]