SiC颗粒增强6061铝合金滑动磨损的周期性与随机性Title：Periodic and Random Sliding Wear of SiC Particle-Reinforced 6061 Aluminum AlloyAbstract:The sliding wear behavior of SiC particle-reinforced 6061 aluminum alloy was investigated for both periodic and random sliding conditions. The wear behavior was evaluated using a T-09 standard test procedure under various sliding distances, sliding velocities, and applied loads. The results indicate that the addition of SiC particles significantly improves the wear resistance of the 6061 aluminum alloy under both periodic and random sliding conditions. The wear mechanism under periodic sliding is dominated by the formation and removal of surface oxide films, whereas under random sliding, the wear mechanism is mainly a combination of abrasive and adhesive wear. The wear rate under periodic sliding is lower than that under random sliding due to the different wear mechanisms.Introduction:The addition of hard particles, such as silicon carbide (SiC), to aluminum alloys has become a widely employed method to improve their mechanical and tribological properties. SiC particles can improve the wear resistance of aluminum alloys due to their high hardness and wear resistance. In this study, the sliding wear behavior of 6061 aluminum alloy reinforced with SiC particles was investigated for both periodic and random sliding conditions.Experimental Procedures:The SiC particle-reinforced 6061 aluminum alloy samples were prepared by a powder metallurgy technique. The samples were then subjected to a T-09 standard test procedure to measure the wear rate under different sliding distances, sliding velocities and applied loads. During the test, the sliding distance was varied from 1 to 5 km, the sliding velocity was 0.06, 0.12 or 0.18 m/s, and the applied load was 10, 20, or 30 N.Results and Discussion:Under periodic sliding, the wear rate of SiC particle-reinforced 6061 aluminum alloy decreases with increasing sliding distance and applied load, while it increases with increasing sliding velocity. This indicates that as the sliding distance and applied load increase, the formation and removal of surface oxide films become more pronounced, reducing the wear rate. However, as the sliding velocity increases, the frictional heat generated on the contact surface also increases, leading to a higher wear rate. Under random sliding, the wear rate increases with increasing sliding distance, sliding velocity and applied load. This indicates that the wear mechanism under random sliding is mainly a combination of abrasive and adhesive wear, which is more severe than the formation and removal of surface oxide films under periodic sliding.Conclusion:The addition of SiC particles significantly improves the wear resistance of 6061 aluminum alloy under both periodic and random sliding conditions. The wear mechanism under periodic sliding is dominated by the formation and removal of surface oxide films while under random sliding, the wear mechanism is a combination of abrasive and adhesive wear. The wear rate under periodic sliding is lower than that under random sliding due to the different wear mechanisms. The presented results provide information on the tribological behavior of SiC particle-reinforced 6061 aluminum alloy and can be used in the design of tribological components subjected to sliding wear conditions.Further analysis of the results indicates that the addition of SiC particles increases the hardness and strength of the 6061 aluminum alloy, which contributes to the improved wear resistance. The SiC particles act as reinforcement and reduce the plastic deformation and abrasion of the matrix. In addition, the presence of SiC particles causes the formation of a thicker and stronger oxide layer on the surface of the aluminum alloy, which improves the wear resistance under periodic sliding.The observation of the worn surfaces shows that under periodic sliding, there is a smoother and more uniform wear track with less plastic deformation, whereas under random sliding, severe damage and plastic deformation are observed due to the combination of abrasive and adhesive wear mechanisms. This suggests that the wear mechanism under random sliding is more complex and severe, leading to a higher wear rate.Overall, the study provides valuable insights into the tribological behavior of SiC particle-reinforced 6061 aluminum alloy under both periodic and random sliding conditions. The findings can be used to optimize the material properties and design of tribological components operating under similar sliding conditions and provide guidance on the selection of suitable reinforcements for improved wear resistance.Further research could investigate the effect of varying the SiC particle size and content on the tribological behavior of the 6061 aluminum alloy. It may also be useful to study the effect of different types of reinforcements, such as carbon nanotubes or graphene, on the wear resist