This paper deals with abrasive wear behavior of two different composite materials namely Al-TiB₂ and Al-TiB₂-nano-graphite. At the time of fabrication, ultrasonic vibration is used along with mechanical stirrer to obtain uniform dispersion of micro (TiB₂) and nano (graphite) reinforcement phase. Uniform dispersion is confirmed through SEM images of cast composites. Micro-hardness values are obtained for composites and base alloy. Wear tests under two-body abrasion are performed by a tribological test apparatus where composite pins are being rubbed against a disc holding different grades of SiC abrasives: 240 grit, 320 grit and 400 grit. Operating load is varied between 10N and 30N while sliding speed and duration of sliding are kept fixed. Effects of load, reinforcing phase content and abrasive grit size on abrasive wear and friction behavior have been evaluated. Al-TiB₂ composites demonstrate higher wear resistance and better friction behavior in comparison with base alloy under all operating conditions. Addition of nano-graphite phase contributes in achieving better abrasive wear and friction performance of Al-TiB₂ composites. With increase in grit size, wear reduces for composites and base alloy while wear increases with load. Worn surfaces of samples and emery papers are studied using SEM micrographs and EDX maps. Wear debris at different operating conditions are studied also using SEM and EDX. Operative wear mechanisms are identified from the experimental results.

本文研究了两种不同的复合材料，即Al-TiB ₂和Al-TiB _2-纳米石墨的磨料磨损行为。在制造时，将超声波振动与机械搅拌器一起使用以使微米级（TiB ₂）和纳米（石墨）增强相。通过铸造复合材料的SEM图像可以确认均匀分散。获得复合材料和基础合金的显微硬度值。通过摩擦学测试设备在两件式磨损下进行磨损测试，其中将复合销钉摩擦到装有不同等级SiC磨料的磨盘上：240粒度，320粒度和400粒度。工作负载在10N到30N之间变化，而滑动速度和滑动持续时间保持固定。已经评估了载荷，增强相含量和磨料粒度对磨料磨损和摩擦行为的影响。钛铝₂与基础合金相比，在所有工作条件下，复合材料均具有更高的耐磨性和更好的摩擦性能。纳米石墨相的添加有助于实现Al-TiB ₂复合材料的更好的磨料磨损和摩擦性能。随着粒度的增加，复合材料和基体合金的磨损减少，而负荷则磨损增加。使用SEM显微照片和EDX贴图研究样品和砂纸的磨损表面。还使用SEM和EDX研究了不同操作条件下的磨损碎片。从实验结果确定了操作磨损机理。