This study aimed at discovering the influence of low-cost eggshell ash (ESA) and boron carbide (B₄C) addition on microstructure and mechanical characteristics of ZA-27 hybrid composites. Six different composites were fabricated utilizing the stir casting technique with different weight percentages of ESA and B₄C particles varied from 0-5 wt.%. Composites were tested for density, hardness, compressive strength, tensile strength, and impact strength. X-ray diffraction (XRD) and scanning electron microscope (SEM) were utilized for the characterization of composites. Microstructure examination using SEM exhibited homogeneously dispersed reinforcements in the matrix. ESA particles decreased the composite density by 3.12%, and after the addition of B₄C particles, density was found to be increased but was still lower than the base ZA-27 alloy. The hardness, tensile and compressive strength of the composites increased with the addition of reinforcements. However, composite reinforced with maximum wt.% of B₄C particles showed a decreasing trend. The impact strength of the composites decreased when compared with the base alloy, but the reduction was marginal. Improved hardness, tensile and compressive strength of the composites was attributed to homogeneously dispersed ESA and B₄C particles in the matrix. Higher tensile strength resulted from strong interfacial bonding between reinforcements and metal matrix, and low impact strength was due to brittle failure and plastic deformation.

本研究旨在发现低成本蛋壳灰 (ESA) 和碳化硼 (B ₄ C) 添加对 ZA-27 杂化复合材料的微观结构和机械特性的影响。六种不同的复合材料使用搅拌铸造技术制造，其中 ESA 和 B ₄ C 颗粒的不同重量百分比在0-5 重量％之间变化。对复合材料的密度、硬度、压缩强度、拉伸强度和冲击强度进行了测试。X射线衍射（XRD）和扫描电子显微镜（SEM）用于表征复合材料。使用 SEM 进行的微观结构检查表明，增强体均匀分散在基体中。ESA 颗粒使复合密度降低 3.12%，加入 B _{4 后}C 颗粒，发现密度增加，但仍低于基础 ZA-27 合金。复合材料的硬度、拉伸和压缩强度随着增强体的加入而增加。然而，用最大重量百分比的 B ₄ C 颗粒增强的复合材料显示出下降趋势。与基体合金相比，复合材料的冲击强度有所下降，但下降幅度很小。复合材料的硬度、拉伸和压缩强度的提高归因于基体中均匀分散的 ESA 和 B ₄ C 颗粒。增强材料与金属基体之间的界面结合力强，抗拉强度高，脆性破坏和塑性变形导致冲击强度低。