Abstract This study deals with the fabrication and tribo-mechanical characterization of magnesium (Mg)-silicon carbide (SiC)- graphite (Gr) hybrid metal matrix composites (MMCs). The hybrid MMCs were fabricated by a mechanical alloying process and their mechanical and tribological properties were investigated as well as compared with those of the base material and the Mg-Gr composite. The morphology analysis of the constituent powders and the hybrid powder mixture was conducted through SEM, EDX and XRD. The microstructure of the sintered MMCs showed a uniform distribution of the reinforcement on the matrix. The developed hybrid MMCs exhibited greater mechanical properties when compared to the base material and the Mg-Gr composite. The tribological characterization of the fabricated hybrid MMCs was studied using the pin-on-disc tribometer under dry sliding conditions. The hybrid MMC composed of 5%Gr and 10%SiC (Mg+5%Gr+10%SiC) demonstrates 92% low wear rate and 53% low friction coefficient than the matrix Mg. Therefore, this hybrid MMC can be a potential candidate to develop components used in the tribological operation.

中文翻译：

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通过机械合金化制造的自润滑 Mg-SiC-Gr 混合金属基复合材料 (MMC) 的机械和摩擦学表征

摘要 本研究涉及镁 (Mg)-碳化硅 (SiC)-石墨 (Gr) 混合金属基复合材料 (MMC) 的制备和摩擦力学表征。通过机械合金化工艺制造混合 MMC，研究了它们的机械和摩擦学性能，并与基材和 Mg-Gr 复合材料的性能进行了比较。通过SEM、EDX和XRD对组成粉末和混合粉末混合物进行形态分析。烧结 MMC 的微观结构显示出增强体在基体上的均匀分布。与基础材料和 Mg-Gr 复合材料相比，开发的混合 MMC 表现出更高的机械性能。在干滑动条件下使用销盘摩擦计研究了制造的混合 MMC 的摩擦学特性。由 5%Gr 和 10%SiC（Mg+5%Gr+10%SiC）组成的混合 MMC 比基体 Mg 的磨损率低 92%，摩擦系数低 53%。因此，这种混合 MMC 可以成为开发用于摩擦学操作的组件的潜在候选者。