This paper investigates microstructural and mechanical characteristics of novel AA7075 composites supplemented with agricultural waste, i.e. rice husk ash and poultry waste, i.e. carbonized eggshells. Both these wastes possess important constituents which make them potential reinforcement material for composites, and their utilization also reduces the problem of disposal to a certain extent. AA7075 composites with varying weight percentages of rice husk ash and carbonized eggshells were prepared through stir casting route. The sum of weight percentages of both reinforcements was kept constant at 5 wt.%. Composites were tested for density and different mechanical properties. Prior to these tests, composites were examined through scanning electron microscopy and energy-dispersive X-ray spectroscopy techniques, wherein uniform distribution of reinforcements was observed. Inclusion of light weight reinforcements decreased the density of composites. Among these composites, highest hardness value was shown by composite having 5 wt.% of rice husk ash with 24.47% enhancement over unreinforced AA7075. Maximum tensile strength and compression strength were exhibited by hybrid composite with 3.75 wt.% rice husk ash and 1.25 wt.% carbonized eggshells. This increment is 28.20% and 16%, respectively, over base composition. Impact strength decreased as the weight percentage of CES increased, thereby indicating brittleness in behaviour. Fractography analysis of tensile and impact test specimens was done through scanning electron microscopy to determine failure mode wherein presence of cracks, voids, dimples, debonding, etc. was observed. Hence, these light weight and low cost green AA7075 composites showed improved properties making them as an alternative as well as sustainable material for automotive and aerospace applications.

本文研究了以农业废弃物（即稻壳灰）和家禽废弃物（即碳化蛋壳）为补充的新型 AA7075 复合材料的微观结构和机械特性。这两种废物都具有重要的成分，使其成为复合材料的潜在增强材料，它们的利用也在一定程度上减少了处理问题。通过搅拌浇铸法制备了不同重量百分比的稻壳灰和碳化蛋壳的AA7075复合材料。两种增强材料的重量百分比总和保持恒定在 5 重量％。测试了复合材料的密度和不同的机械性能。在这些测试之前，通过扫描电子显微镜和能量色散 X 射线光谱技术检查复合材料，其中观察到增强物的均匀分布。轻质增强材料的加入降低了复合材料的密度。在这些复合材料中，含有 5 wt.% 稻壳灰的复合材料显示出最高的硬度值，比未增强的 AA7075 提高了 24.47%。具有 3.75 wt.% 稻壳灰和 1.25 wt.% 碳化蛋壳的混合复合材料表现出最大的拉伸强度和压缩强度。这个增量分别是基础成分的 28.20% 和 16%。冲击强度随着 CES 重量百分比的增加而降低，从而表明行为变脆。拉伸和冲击试样的断口分析通过扫描电子显微镜进行以确定失效模式，其中观察到裂纹、空隙、凹坑、脱粘等的存在。因此，