CAJ | 학술논문

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。
재고능초성장하이용용체원위반응제비TiB2/Al?30Si복합재료；이용XRD、SEM급간마손시험연구차복합재료적현미조직화마손성능。결과표명：재고능초성장작용하，원위TiB2과립재려기체중분포균균，형모위원형혹사변형，척촌재0.1~1.5μm지간。초생규적형모위사변형，평균척촌위10μm。수착고능초성공솔적증가， Al?30Si기체합금급TiB2/Al?30Si복합재료적경도명현제고；특별시당초성공솔위1.2 kW시，복합재료적경도체도412 MPa，시기체합금적1.3배。복합재료적마손성능득도명현제고，재하적변화대복합재료적마손량영향불대。
TiB2/Al?30Si composites were fabricated via in-situ melt reaction under high-energy ultrasonic field. The microstructure and wear properties of the composite were investigated by XRD, SEM and dry sliding testing. The results indicate that TiB2 reinforcement particles are uniformly distributed in the aluminum matrix under high-energy ultrasonic field. The morphology of the TiB2 particles is in circle-shape or quadrangle-shape, and the size of the particles is 0.1?1.5μm. The primary silicon particles are in quadrangle-shape and the average size of them is about 10μm. Hardness values of the Al?30Si matrix alloy and the TiB2/Al?30Si composites considerably increase as the high energy ultrasonic power increases. In particular, the maximum hardness value of the in-situ composites is about 1.3 times as high as that of the matrix alloy when the ultrasonic power is 1.2 kW, reaching 412 MPa. Meanwhile, the wear resistance of the in-situ TiB2/Al?30Si composites prepared under high-energy ultrasonic field is obviously improved and is insensitive to the applied loads of the dry sliding testing.