SiCp/Mg非均匀纳米复合材料的微结构演化与合成机理  

Microstructure Evolution and Synthesis Mechanism of Heterogeneous SiCp/Mg Nanocomposites

作　　者：涂林 刘金铃 TU Lin;LIU Jinling(School of Mechanics and Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学力学与工程学院,成都610031

出　　处：《四川轻化工大学学报（自然科学版）》2020年第4期29-35,共7页Journal of Sichuan University of Science & Engineering(Natural Science Edition)

基　　金：国家自然科学基金面上项目(51871187)。

摘　　要：研究了通过一步球磨的粉末冶金工艺制备Si Cp/Mg非均匀纳米复合材料的机理。采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、能谱仪(EDS)和电子背散射衍射(EBSD)对SiCp/Mg复合粉体的形貌演化过程、非均匀纳米复合材料的物相组成和微观结构特征进行了分析。结果表明:在球磨的过程中,附着在镁颗粒表面的纳米碳化硅粉体嵌入镁颗粒的表层形成核壳结构;复合粉体芯部不仅没有SiC颗粒,而且未受到研磨球的直接作用,使得复合粉体芯部仍然保持为尺寸较大的粗晶,将这种复合粉体进行烧结就能获得非均匀纳米复合材料;通过调节球磨时间,可以对非均匀纳米复合材料的微观结构进行调控。The synthesis mechanism of SiCp/Mg nanocomposites with heterogeneous structure prepared by powder metallurgy is investigated.The morphology evolution of SiCp/Mg nanocomposite powder,material composition and microstructure of SiCp/Mg nanocomposites are characterized by scanning electron microscope(SEM),X-ray diffractometer(XRD),energy dispersive spectrometer(EDS),and electron backscatter diffraction(EBSD).The results show that the SiC nanoparticles are embedded into the Mg particles to form a core-shell structure during the milling process;the SiCp/Mg nanocomposite with heterogeneous structure is composed of a pure magnesium phase with retained coarse grains;the microstructure of heterogeneous SiCp/Mg nanocomposite can be controlled by changing the ball milling time.

关 键 词：球磨 非均匀结构 镁基纳米复合材料 软相 硬相 碳化硅 

分 类 号：TB331[一般工业技术—材料科学与工程]