Mechanical milling presents an effective solution in producing a homogenous structure for composites. The present study focused on the production of 0.5 wt% yttria nanoparticle reinforced 7075 aluminum alloy composite in order to examine the effects of yttria dispersion and interfacial bonding by ball milling technique. The 7075 aluminum alloy powders and yttria were mechanically alloyed with different milling times. The milled composites powders were then consolidated with the help of hot pressing. Hardness, density, and tensile tests were carried out for characterizing the mechanical properties of the composite. The milled powder and the microstructural evolution of the composites were analyzed utilizing scanning and transmission electron microscopy. A striking enhancement of 164% and 90% in hardness and ultimate tensile strength, respectively, were found compared with the reference 7075 aluminum alloy fabricated with the same producing history. The origins of the observed increase in hardness and strength were discussed within the strengthening mechanisms' framework.

机械铣削是生产复合材料均质结构的有效解决方案。本研究的重点是生产 0.5 wt% 氧化钇纳米颗粒增强的 7075 铝合金复合材料，以检查球磨技术对氧化钇分散和界面结合的影响。7075 铝合金粉末和氧化钇通过不同的研磨时间进行机械合金化。然后在热压的帮助下将研磨的复合材料粉末固结。进行硬度、密度和拉伸试验以表征复合材料的机械性能。使用扫描和透射电子显微镜分析研磨的粉末和复合材料的微观结构演变。硬度和极限拉伸强度分别显着提高 164% 和 90%，发现与具有相同生产历史的参考 7075 铝合金相比。在强化机制的框架内讨论了观察到的硬度和强度增加的起源。