制備與評價
( 哈爾濱工業(yè)大學 材料科學與工程學院， 哈爾濱 150001)
摘 要: 采用濕成型法制備了體積分數可以調節(jié)的碳化硅晶須與納米碳化硅顆粒混雜的預制塊，確定了擠壓鑄造法制備混雜增強鋁基復合材料的工藝參數。 通過掃描電鏡和透射電鏡分析發(fā)現： 復合材料中晶須與納米顆粒分布均勻， 并與基體合金的界面結合良好， 無界面反應物和孔洞；與基體合金相比， 混雜增強復合材料的抗拉強度和彈性模量明顯增高， 延伸率降低； 在晶須體積分數一定時， 隨納米SiC顆粒體積分數的增加， 復合材料的抗拉強度升高。
關鍵字: 復合材料； 擠壓鑄造； 晶須； 納米顆粒； 混雜
（ School of Materials Science and Engineering,Harbin Institute of Technology, Harbin 150001, China）
Abstract: Hybrid performs with a controllable volume fraction of SiC whiskers and nanoscale SiC particles were made by wet blending. Manufacturing process of Al matrix hybrid composites reinforced with whiskers and nanoparticles by squeeze casting route were studied. SEM and TEM observation results show that the reinforcements distribute homogenously in the matrix, and the interfacial bonding between matrix and reinforcement is well. Compared with the matrix alloy, tensile strength and elastic modulus of the hybrid composites increase obviously, while the elongation decreases. When the volume fraction of SiC whiskers is a constant, tensile strength of the hybrid composites increases with the increasing content of SiC particles.
Key words: composites; squeeze casting; whisker; nanoparticle; hybrid
