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采用离心铸造制备原位初生Si和Al3Ni颗粒混合增强铝基复合材料的筒状铸件。通过光学显微镜(OM)、XRD、SEM、EDS以及洛氏硬度计等研究了复合材料的组织和性能。结果表明,所制备的复合材料铸件外层偏聚少量初生Si和大量Al3Ni颗粒,内层偏聚大量初生Si和少量Al3Ni颗粒,中间层没有增强颗粒。从铸件的外层到内层,增强颗粒的含量先降低后升高,复合材料的硬度也呈现出相应的变化规律。分析了离心场中多相流体的运动规律,发现复合材料中增强颗粒的分布与高重力系数G参数条件下初生Si和Al3Ni颗粒的密度以及它们的相互碰撞、粘结等作用有关。
Centrifugal Casting Preparation of In-situ Primary Si and Al3Ni Particle Reinforced Aluminum Matrix Composites for Cylindrical Castings. The microstructure and properties of the composites were investigated by optical microscope (OM), XRD, SEM, EDS and Rockwell hardness tester. The results show that the outer layer of the composite castings segregates a small amount of primary Si and a large amount of Al3Ni particles, the inner layer segregates a large amount of primary Si and a small amount of Al3Ni particles, and the intermediate layer has no reinforcing particles. From the outer layer to the inner layer of the castings, the content of the reinforced particles first decreases and then increases, and the hardness of the composite material also shows a corresponding change rule. The movement law of multiphase fluid in centrifugal field was analyzed and it was found that the distribution of reinforcing particles in the composite material was related to the density of primary Si and Al3Ni particles and their interaction and bonding under the conditions of G parameters.