论文部分内容阅读
在高能超声场下利用熔体原位反应制备TiB2/Al-30Si复合材料;利用XRD、SEM及干磨损试验研究此复合材料的显微组织和磨损性能。结果表明:在高能超声场作用下,原位TiB2颗粒在铝基体中分布均匀,形貌为圆形或四边形,尺寸在0.1~1.5μm之间。初生硅的形貌为四边形,平均尺寸为10μm。随着高能超声功率的增加,Al-30Si基体合金及TiB2/Al-30Si复合材料的硬度明显提高;特别是当超声功率为1.2 kW时,复合材料的硬度达到412 MPa,是基体合金的1.3倍。复合材料的磨损性能得到明显提高,载荷的变化对复合材料的磨损量影响不大。
TiB2 / Al-30Si composites were prepared by melt in-situ reaction under high-energy ultrasonic field. The microstructure and wear properties of the composites were investigated by XRD, SEM and dry wear tests. The results show that the in-situ TiB2 particles distribute uniformly in aluminum matrix under the action of high-energy ultrasonic field. The morphology of the particles is round or quadrilateral with the size of 0.1 ~ 1.5μm. Primary silicon morphology quadrilateral, the average size of 10μm. The hardness of Al-30Si matrix alloy and TiB2 / Al-30Si composites increased obviously with the increase of high-power ultrasonic power. The hardness of the composites reached 412 MPa and 1.3 times that of the matrix alloy especially when the ultrasonic power was 1.2 kW . The wear performance of composites is obviously improved. The change of load has little effect on the wear of composites.