The paper reports wear and friction performance of Al-12Si aluminum alloy reinforced with 1.5 wt% submicron boron carbide (B₄C) particles. Composite material is fabricated by ultrasonic stir casting process. Microstructural examination is carried out using optical microscopy and field emission scanning electron microscopy (FESEM). Incorporation and agglomeration-free dispersion of B₄C particles is detected in the aluminum matrix. Pin-on-disc tribotester is used to evaluate tribological performance of fabricated composite and base alloy under room temperature dry conditions. Nominal contact pressure of 0.707 MPa is applied against EN31 steel counterface, and sliding speeds are varied between 0.25 and 1.25 m/s. Influence of sliding distance is investigated by varying sliding durations from 10 to 40 min at two fixed load-speed (PV) factors of 10 and 25 Nm/s. Worn pin surfaces and collected wear debris are analyzed using FESEM and energy-dispersive spectroscopy to reveal undergoing wear mechanisms. After initial decrease, wear rate increased almost linearly with speed and became twofold at the top speed. Wear rate transition is seen at 0.5 m/s with sliding distance for the applied pressure. Friction coefficient is not influenced significantly with sliding distance for the fixed PV condition. Adhesion and delamination governed the wear mechanism of base alloy while mechanically mixed layer played key role in the wear performance of composite matrix. Improved wear resistance of aluminum matrix is observed due to incorporation of small amount of B₄C particulates making the composite better suited for wear-resistant applications than base alloy.

该论文报告了用 1.5 wt% 亚微米碳化硼 (B ₄ C) 颗粒增强的 Al-12Si 铝合金的磨损和摩擦性能。复合材料是通过超声波搅拌铸造工艺制造的。使用光学显微镜和场发射扫描电子显微镜 (FESEM) 进行微观结构检查。B _{4 的}掺入和无凝聚分散在铝基体中检测到 C 颗粒。Pin-on-disc 摩擦测试仪用于评估制造的复合材料和基础合金在室温干燥条件下的摩擦学性能。对 EN31 钢配合面施加 0.707 MPa 的标称接触压力，滑动速度在 0.25 和 1.25 m/s 之间变化。通过在 10 和 25 Nm/s 的两个固定负载速度 (PV) 因素下从 10 到 40 分钟改变滑动持续时间来研究滑动距离的影响。使用 FESEM 和能量色散光谱分析磨损的销表面和收集的磨损碎片，以揭示发生的磨损机制。在最初下降后，磨损率几乎随速度线性增加，在最高速度时变为两倍。在 0.5 m/s 处看到磨损率转变，滑动距离为施加压力。在固定 PV 条件下，摩擦系数不受滑动距离的显着影响。粘附和分层控制着基体合金的磨损机制，而机械混合层对复合基体的磨损性能起关键作用。由于掺入少量 B，观察到铝基体的耐磨性提高₄ C 颗粒使复合材料比基础合金更适合耐磨应用。