原位生长铝基复合材料的工艺研究  

The Process Study Of In-situ Aluminium Matrix Composites

作　　者：万红[1] 潘进[1] 杨德明[1] 

机构地区：[1]国防科技大学材料工程与应用化学系,长沙410073

出　　处：《宇航材料工艺》1998年第1期36-40,共5页Aerospace Materials & Technology

摘　　要：以金属氧化物粉末（或晶须）（CuOp、ZnOp、TiO2（w））和铝进行置换反应原理为基础，对挤压铸造法、超声振动反应法制备原位生长的铝基复合材料的工艺进行了探索。光学金相观察和X射线衍射分析表明：挤压铸造过程中，金属氧化物与铝几乎未发生反应，挤压后的复合材料经进一步热处理后，反应进行完全，得到Al2O3／Al复合材料；热处理后，复合材料的显微硬度值有明显的改变；超声振动反应中，在功率超声的作用下，TiO2（w）能在铝镁合金熔液中分散、润湿并发生反应，得到尺寸十分细小（＜1μm）的MgO、AgAl2O4和块状的TiAl3增强的铝基复合材料，细小氧化物颗粒强化区的显微硬度为210。Two in-situ processes, the Squeeze casting and ultra-sonic vibration reacting infiltration, were invistigated to prepare in-situ Al matrix composites, based on the principle that some metal oxides can substitute aluminium. Bymeans of optical microscope and X-ray diffraction, it can be concluded that the metal oxides almost do not react withmolten aluminium in the process of squeeze casting. After heat-treating the squeete casting sample, the metal oxides andaluminium react compeletely and in-situ Al2O3/Al was obtained, accompanying with an obvious increase of the value ofmicro-hardness. In the process of ultra-sonic vibration, TiO2 whisker can be dispersed, infiltrated and react with Al-Mgmolten easily under the power of ultrasonce. Then an aluminium matrix composite, reinforced by TiAl3, fine MgO andMgAl2O4 particles which diameter are less than 1μmn, was obtained. The micro-hardness value of the area reinforced byfine particles is 210.

关 键 词：原位生长 挤压铸造 超声振动反应 铝基 复合材料 

分 类 号：TB331[一般工业技术—材料科学与工程]