原位法制备TiC_p/AZ91复合材料及摩擦磨损性能的研究

Research on In-situ Fabrication and Wear Properties of TiC_p /AZ91 Composites

以Al-Ti-C为反应体系,采用热爆法在AZ91合金熔体中合成了TiC颗粒并对复合材料的摩擦磨损性能进行研究。结果表明,在750℃温度下,Al-Ti-C体系中Al含量为40%时,原位反应进行得最充分,生成的TiC颗粒细小,在复合材料中分布均匀。复合材料试样的摩擦磨损研究表明,当TiC含量在0%～5%时,复合材料的耐磨性能随着TiC含量的增加显著提高,磨损机理由AZ91基体的粘着磨损逐渐转变为磨粒磨损。

The TiC particulate reinforced AZ91 alloy matrix composites was fabricated using in-situ reaction in melt of magnesium alloy with Al-Ti-C system and its wear properties were also investigated. The results showed that reactions were sufficient with 40 wt% aluminum in Al-Ti-C system at 750℃. TiC particulate was small and distributed homogeneously in the matrix of composites. The results of dry friction experiments indicated that the wear resistances of the composites with 0 wt%-5 wt% TiC were improved obviously and the friction mechanism changed from conalutination abrasion in AZ91 alloy to arain abrasion with increasinQ of the TiC content.