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采用离心铸造方法制备了Al-16Si-6Ti复合材料筒状零件,使用SEM,EDS及OM观察分析了复合材料中的微观组织,使用Image Tool测算了铸件中初生颗粒的体积分数,测试了复合材料的硬度及耐磨性能。结果表明:离心铸造Al-16Si-6Ti筒状零件沿半径方向形成了具有大量初生Ti(AlSi)2颗粒的外层增强层组织,无初生颗粒的铝基体中间层组织以及含有少量初生Si颗粒的内层组织。从外壁到内壁,铸件的硬度及初生颗粒的体积分数均呈现先由高到低,然后小幅上升的变化规律。铸件外层组织具有最好的耐磨性能。在离心场中,初生Ti(AlSi)2向铸件外侧偏移、聚集,形成了高体积分数的初晶Ti(AlSi)2颗粒增强铸件外层的Al基复合材料。
The Al-16Si-6Ti composite tubular parts were prepared by centrifugal casting method. The microstructure of the composite was observed by SEM, EDS and OM. The volume fraction of primary particles in the castings was measured by Image Tool. Hardness and wear resistance. The results show that the microstructure of Al-16Si-6Ti tubular parts formed by centrifugal casting along the radial direction is the outer reinforcing layer with a large amount of primary Ti (AlSi) 2 particles, the aluminum matrix without primary particles and the primary Si particles with small amount of primary Si particles Inner tissue. From the outer wall to the inner wall, the hardness of castings and the volume fraction of primary particles showed a change from high to low and then a slight increase. The outer layer of castings has the best wear resistance. In the centrifugal field, the primary Ti (AlSi) 2 migrated to the outside of the casting and aggregated to form the Al-based composite material with the outer layer of the primary crystal Ti (AlSi) 2 particles with high volume fraction.