The present investigation intends to study the tribological behaviour of ZA-27 alloy reinforced with low-cost eggshell ash (ESA) and boron carbide (B₄C) particles by utilizing a stir casting process to fabricate hybrid metal matrix composites. The percentage of ESA and B₄C particles are added in the range of 0–5 wt.%. Composites being tested for density, porosity and microhardness. A pin-on-disc DUCOM tribometer used to investigate the friction and wear behaviour of composites with a varying load of 10 to 50 N at a constant sliding speed of 1 m s⁻¹ and a fixed sliding distance of 1500 meter. To study the influence of speed on friction and wear behaviour, tribological testing was also performed at a sliding speed of 2 m s⁻¹ and 3 m s⁻¹. The composites microstructure revealed the presence of ESA and B₄C particles examined by scanning electron microscope (SEM) and energy-dispersive x-ray spectroscopy (EDS) analysis confirmed the elemental composition of reinforcement particles present in the matrix. Composites density decreased when reinforced with ESA and B₄C particles and the maximum decrease in density was about 3.12%. Porosity of the composites increased with the increase in wt.% of B₄C particles. Addition of ESA and B₄C particles significantly improved composites microhardness. The coefficient of friction (COF) and wear loss showed an increasing trend with the increase in load, whereas COF decreased and wear loss increased on higher sliding speeds. Composites showed superior wear resistance over base alloy under all test conditions. Worn surface morphology indicated the delamination, plastic deformation and ploughing at low speed, whereas abrasion was the dominant wear mechanism at higher sliding speeds. Therefore, this hybrid composite may have the potential to be used as a bearing material for tribological applications over monolithic ZA-27 alloy.

本研究旨在通过搅拌铸造工艺制造混合金属基复合材料，研究用低成本蛋壳灰 (ESA) 和碳化硼 (B ₄ C) 颗粒增强的 ZA-27 合金的摩擦学行为。ESA 和 B ₄ C 颗粒的百分比在 0-5 wt.% 的范围内添加。正在测试复合材料的密度、孔隙率和显微硬度。销盘式 DUCOM 摩擦计用于研究复合材料在 10 到 50 N 的变化载荷下在 1 ms ^-1的恒定滑动速度和 1500 米的固定滑动距离下的摩擦和磨损行为。为了研究速度对摩擦和磨损行为的影响，还在 2 ms ^-1和 3 ms的滑动速度下进行了摩擦学测试^-1。复合材料的微观结构显示存在 ESA 和 B ₄ C 颗粒，通过扫描电子显微镜 (SEM) 和能量色散 X 射线光谱 (EDS) 分析证实了基体中存在的增强颗粒的元素组成。当用 ESA 和 B ₄ C 颗粒增强时，复合材料的密度降低，密度的最大降低约为 3.12%。复合材料的孔隙率随着 B ₄ C 颗粒重量百分比的增加而增加。添加 ESA 和 B ₄C粒子显着提高了复合材料的显微硬度。摩擦系数（COF）和磨损损失随着载荷的增加呈增加趋势，而随着滑动速度的增加，摩擦系数（COF）和磨损损失增加。在所有测试条件下，复合材料均表现出优于基础合金的耐磨性。磨损的表面形态表明分层、塑性变形和低速犁沟，而磨损是较高滑动速度下的主要磨损机制。因此，这种混合复合材料有可能用作摩擦学应用的轴承材料，而不是整体 ZA-27 合金。