硼酸铝晶须增强Al复合材料的性能及界面结构

采用挤压铸造工艺制备出复合良好的9Al_2O_3 2B_2O_3晶须增强6061Al合金及纯Al复合材料研究表明,T6处理不能提高9Al_2O_3 2B_2O_3w/6061Al复合材料的力学性能,其原因是T6处理后复合材料中的界面反应明显加重利用透射电子显微术对此复合材料界面的观察与分析认为,界面上存在着严重的化学反应,反应物为Al_2MgO_4将制造态与T6态的界面结构对比发现,正是这种界面化学反应对材料的性能产生不利影响而在9Al_2O_3 2B_2O_3w/纯Al界面上未发现任何化学反应。界面能谱EDS成分分析结果表明,上述界面化学反应是由材料制造过程中基体合金中的Mg在界面上原子偏聚造成的

MECHANICAL PROPERTIES AND INTERFACIAL STRUCTURES OF ALUMINIUM BORATE WHISKER REINFORCED Al COMPOSITES

Quality 9Al_2O_3·2B_2O_3 whisker reinforced 6061Al or Al composites havebeen prepared by technique of squeexe casting. Mechanical properties of the 9Al_2O_32B_2O_3(w)/6061Al composites could be hardly improved by T6 treatment, owing to cause theremarkable interfacial reaction. An observation under high resolution transmission electronmicroscopy on interfaces shows that the serious chemical reaction occurs and the product isAl_2MgO_4. But no such reaction is found at the interfaces of 9Al_2O_3·2B_2O_3(w)/Al compo-site. EDS analysis on the interfaces shows that above mentioned interfacial reaction may beresulted from the interfacial segregation of Mg atoms in 6061Al matrix during sequeeze cast-ing.