累积叠轧Cu-Fe复合材料组织与磨损性能研究

Investigation on microstructure and wear performance of Cu-Fe composite fabricated by accumulative roll bonding

  • 摘要: 利用累积叠轧焊合技术(ARB)制备了铜-铁颗粒增强复合材料。测定了不同轧制道次复合材料的硬度、导电率和摩擦磨损性能,并重点研究了轧制道次对复合材料的颗粒分散性、界面结合、磨损机制的影响规律。结果表明,随着轧制道次的增加,复合材料的界面结合效果逐步提升,颗粒增强体的分散效果显著增强,在8道次后材料界面呈现完全焊合状态,Fe颗粒弥散分布于板间,此时材料硬度达到最大值138.49 HV,但导电率和摩擦系数比低循环时有所降低,分别为81.6%IACS、0.337。复合材料的磨损机制随轧制道次的逐渐增加由疲劳磨损和磨粒磨损为主导逐渐转变为以黏着磨损为主导,当轧制道次增加至6次后若继续增加,磨损机制又转变为以疲劳磨损和磨粒磨损为主导。

     

    Abstract: Cu-Fe particle-reinforced composites were prepared using the Accumulative Roll Bonding (ARB) technology. The hardness, electrical conductivity and friction wear properties of the composites under different cycling conditions were measured, with particular emphasis on the effect of rolling cycles number of the particle dispersion, interfacial bonding and wear mechanism of the composites. The results show that with increasing rolling cycles number, the interfacial bonding in the composites is gradually improved and the dispersion effect of the particle reinforcement is significantly enhanced. The material’s interface shows a fully welded state after 8 cycles. The Fe particles are diffusely distributed in the inter-plate, and the hardness of the material reaches the maximum value of 138.49 HV. However, compared with the low-cycle condition, both the electrical conductivity and the friction coefficient decrease, reaching 81.6% IACS and 0.337, respectively. The dominant wear mechanism of the composites gradually changes from fatigue and abrasive wear to adhesive wear as the number of cycles increases. When the number of rolling cycles increases to 6 and then continues to increase, the dominant wear mechanism shifts back to fatigue and abrasive wear.

     

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