电磁搅拌制备TiB2颗粒增强7055铝基复合材料的研究.pdfVIP

学兔兔 Dec．2009 铸 造 VO1．58 NO．12 FO RY 电磁搅拌制备TiB2颗粒增强7055铝基 复合材料的研究 徐 萌，陈 刚，赵玉涛，彭 蕾，吴志峰，王国路，黄 康 (江苏大学材料科学与工程学院，江苏镇江212013) 摘要：在电磁搅拌的条件下，通过盐一熔体原位反应生成了亚微米级TiB 增强颗粒，并在熔体凝固过程中施加电磁搅 拌，获得TiB 颗粒增强的7055基复合材料铸态组织。试验结果表明，电磁搅拌作用下，熔体的传热和传质速度增加， 铝液与反应盐的接触面积也增大，TiB 颗粒的生成量大大提高，并促进了颗粒在基体中的弥散分布，减少了颗粒的团 聚；同时，在熔体凝固过程中施加电磁搅拌，提高了基体材料的致密度，细化了基体晶粒尺寸。 关键词：电磁搅拌；TiB：；原位反应；复合材料 中图分类号：TG292 文献标识码：A 文章编号：1001—4977(2009)12—1233—05 Investigation of In．Situ Prepared TiB2／7055 AIuminium Matrix Com posite Under Electromagnetic Stirring _ _ — — — — XU Meng，CHEN Gang，ZHAO Yu—tao，PENG Lei，WU Zhi—feng，WANG Guo—lu，HUANG Kang (School of Materials Science and Engineering，Jiangsu University，Zhenjiang 21 201 3，Jiangsu，China) Abstract：Under conditions of electromagnetic stirring，sub-micron TiB2 particles were prepared by salt—melt reaction，besides，in the process of solidification，electromagnetic stirring was also introduced to obtain TiB，particle reinforced 7055 aIuminium matrix composite cast structure．The result indicates that under conditions of electromagnetic stirring，the speed of thermal transmission and mass transmission in melt is improved．the contact area of aluminium melt and salt is enhanced and the number of TiB，is also largely increased electromagnetic stirring also promotes particles dispersion，meanwhile，electromagnetic stirring in the process of solidification can decrease component segregation and gain finer grain． Key words：electromagnetic stirring；TiB，：in—situ；composite 原位合成工艺是