体育器材用TiCp增强铝基复合材料的组织及性能研究

    Microstructure and Properties of TiCp-reinforced Aluminum Matrix Composites for Sports Equipment

    • 摘要: 针对体育器材用铝合金在长期服役过程中易出现磨损失效的问题,采用快速热压烧结技术制备了不同体积分数的TiCp /6061铝基复合材料,研究了TiCp体积分数对该复合材料微观形貌、物相组成、硬度、磨损体积和摩擦系数的影响。结果表明,当TiCp体积分数含量为6vol%和12vol%时,TiCp弥散分布于基体中,颗粒与基体结合良好;当TiCp的体积分数为18vol%时,出现明显的TiCp团聚现象;当TiCp的体积分数增加至24vol%时,出现严重的TiCp团聚现象,基体上存在大量孔隙。该复合材料主要由Al相和TiC相组成,其硬度随TiCp体积分数的增加而增加,体积分数为24vol%时达到最大,为42.9 HRA,相比6061铝基体增加了105.3%;当TiCp体积分数为18vol%时,磨损体积、平均摩擦系数最小。

       

      Abstract: In view to the problem that the Al alloys for sports equipment were susceptible to wear and failure during long term service periods, the rapid hot-press sintering technique was employed to fabricate aluminum matrix composites TiC/6061 reinforced with different volume fractions of TiCp.The effects of TiCp volume fraction on the microstructure, phase composition, hardness, wear volume, and friction coefficient of the composites were investigated. The results show that TiC particles are uniformly dispersed in the matrix with good interfacial bonding when the volume fractions of TiC particles are 6 vol% and 12 vol%. Obvious agglomeration of TiCp occurs at 18 vol%, and severe agglomeration with numerous pores in the matrix is observed when the TiCp content increases to 24vol%. The composites is mainly composed of Al and TiC phases. The Rockwell hardness of the composites increases with the increase of TiCp volume fraction, reaching a maximum of 42.9 HRA at 24vol%,which is 105.3% higher than that of the 6061 Al matrix. The minimum wear volume and average friction coefficient are achieved at 18vol% TiCp.

       

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