脉冲磁场下原位合成TiB_2/7055铝基复合材料的组织和力学性能  

Microstructures and mechanical properties of in situ TiB_2/7055 composites synthesized by pulsed magnetic field

作　　者：钟龙华[1] 赵玉涛[1] 张松利[1] 陈帅[1] 吴江敬[1] 焦雷[1] 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013

出　　处：《功能材料》2013年第3期340-344,共5页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50971066;51174098);江苏省"333"高层次人才工程资助项目(2008-46);江苏省科技支撑资助项目(2009127);江苏省高校优秀创新团队资助项目(2011-11);江苏大学重点实验室摩擦工程资助项目(kjsmcx0903);江苏省大学生创新实践资助项目(1201220072)

摘　　要：脉冲磁场下,采用7055-(Al-3%B)-Ti剂体系熔体原位反应法成功制备TiB2/7055铝基复合材料。利用XRD、OM和SEM等测试技术研究了复合材料的相组成和微观组织,同时在电子拉伸试验机上测试了复合材料的拉伸性能。结果表明,磁场作用下,原位反应更快更充分,颗粒分布更均匀,生成的TiB2颗粒呈六边形或多边状,平均尺寸约为600nm,α-Al晶粒细化到约10～20μm,第二相由连续网格状分布转变为非连续性分布。复合材料的抗拉强度从310MPa提高到333MPa,延伸率从7.5%提高到了8.0%。Under the pulsed magnetic field,in situ TiB2/7055 composites were successfully synthesized by direct melt reaction from 7055-（Al-3%B）-Ti system.The phase compositions and the microstructures of the composites were investigated by XRD,OM and SEM,and the tensile properties are tested by electronic tensile testing machine.The results indicate that the reaction process was faster and fully with pulsed magnetic field assistance,and the distributions of particles are uniform.The morphologies of the TiB2 particles were mainly with hexagonal-shape or nearly polygon,and the size was about 600nm.The average grain sizes of α-Al are decreased to 10-20μm,and the array of the second phases were changed from continuous net-shape to discontinuous shape.The tensile strengths of the composites were enhanced from 310 to 330MPa,and the elongations were increased from 7.5% to 8.0%.

关 键 词：脉冲磁场 原位复合材料 微观组织 拉伸性能 

分 类 号：TB331[一般工业技术—材料科学与工程]