中文摘要：

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。

英文摘要：

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.