粉末冶金法炭纤维/Mg复合材料的界面对其力学性能的影响  

Effect of interface properties on the mechanical performance of carbon fiber/Mg composites fabricated by powder metallurgy

作　　者：任富忠[1] 高家诚[1] 李伟[1] 张敏[1] 谭尊[1] 

机构地区：[1]国家镁合金材料工程技术研究中心,重庆大学材料科学与工程学院,重庆400030

出　　处：《新型炭材料》2011年第4期278-286,共9页New Carbon Materials

基　　金：国家自然科学基金(10876045)~~

摘　　要：采用表面化学镀镍前后的短炭纤维(Cf)做为增强体,纯镁粉为基体金属,通过粉末冶金法和热挤压制备镁基复合材料。采用SEM-EDS、TEM、XRD和拉伸等测试手段表征短炭纤维增强镁基复合材料的微观形貌、元素组成、物相组成及其力学性能。结果表明:炭纤维在复合材料中分布均匀且沿挤压方向定向排列;采用经过表面化学镀镍处理的短炭纤维与金属镁复合后界面结合状态优良,M g2N i物相的存在表明润湿性的改善是通过金属镁与涂层发生反应而实现;对比屈服强度测试值和理论计算值的大小,表明涂层炭纤维增强镁基复合材料的增强机理主要是界面载荷传递效应。Carbon fiber/magnesium composites were fabricated by powder metallurgy techniques using short carbon fibers electrolessly coated and uncoated by nickel as reinforcement and pure magnesium powder as matrix.SEM-EDS,TEM,XRD and tensile tests were used to characterize their interfacial morphology,elemental composition,phase composition and mechanical properties.Results showed that the carbon fibers were uniformly distributed in the composites and were preferentially oriented parallel to the extrusion direction.The interfacial bonding between carbon fibers and magnesium was improved by the nickel coating.The improvement was achieved by a reaction between the nickel coating on the fibers and magnesium to form Mg2Ni.The reinforcing effect of the nickel-coated carbon fibers was achieved by interfacial load transfer as evaluated by comparing the measured yield strengths with the theoretical values.

关 键 词：化学镀镍 短炭纤维 界面 镁基复合材料 

分 类 号：TF124[冶金工程—粉末冶金]