Aluminum-based metal matrix composites (MMCs) offer a high strength-to-weight ratio with excellent abrasion resistance, finding vast applications in aerospace industries. However, machining these materials is difficult due to the high hardness and wear resistance resulting in a shortened tool life. In this context, Al 7075 hybrid MMC was fabricated with reinforcing elements of TiO₂ and Gr (graphite) particles. Furthermore, the machinability of newly fabricated HMMC was investigated under dry, MQL with vegetable oil, cryogenic CO₂, and hybrid (MQL + CO₂) cutting environments. As per the originality of this work, no studies compared the machinability of Al 7075 HMMC under selected cutting environments. With the reinforcement in Al alloy, the higher cutting forces and deteriorated surface finish were observed with dry milling. The abrasion wear mechanism will dominate under all cutting environments with various feeds and speeds. The combination of MQL + CO₂ cutting environments was found to be more effective in terms of cutting forces, with a reduction of 39 to 28% compared to other selected cutting environments. The surface roughness was reduced by 18%, 15%, and 13% with favorable chip generation under MQL + CO₂ than that of dry, MQL, and CO₂ cooling modes. Additionally, MQL + CO₂ showed enhanced tool life with a significant reduction in tool wear.

铝基金属基复合材料 (MMC) 具有高强度重量比和优异的耐磨性，在航空航天工业中有着广泛的应用。然而，由于这些材料的高硬度和耐磨性导致刀具寿命缩短，加工这些材料很困难。在这种情况下，Al 7075 混合MMC 是用TiO ₂和Gr（石墨）颗粒增强元素制成的。此外，还研究了新制造的 HMMC 在干切削、植物油 MQL、低温 CO ₂和混合 (MQL + CO ₂ ) 切削环境下的切削加工性。根据这项工作的原创性，没有研究比较 Al 7075 HMMC 在选定切削环境下的切削加工性。随着铝合金的增强，干铣削中观察到更高的切削力和恶化的表面光洁度。在具有不同进给量和速度的所有切削环境下，磨损机制将占主导地位。研究发现，MQL + CO ₂切削环境的组合在切削力方面更有效，与其他选定的切削环境相比，切削力降低了 39% 至 28%。与干式、MQL 和 CO _{2冷却模式相比，MQL + CO 2}冷却模式下的表面粗糙度分别降低了 18%、15% 和 13%，并且具有良好的切屑生成效果。此外，MQL + CO ₂还显示出更长的刀具寿命和显着减少的刀具磨损。