Investigation of recycled aluminum matrix composites reinforced with copper and g-alumina manufactured by sinter and sinter + forging methods

The present work reviews the toughening mechanisms and microstructural analyses of recycled hybrid metal matrix composites (aluminium-based) reinforced with γ-alumina (Al₂O₃) and pure recycled copper. This composite was manufactured by sintering and the combined process of sintering + forging. To analyze the mechanical and physical behavior of hybrid metal matrix composite materials, quasi-static compression, three-point bending (3PB), and low-velocity impact (dynamic compression) experiments were carried out. Additionally, wear and creep tests were conducted with a nanoindenter to evaluate the wear and time-dependent behavior of this composite. Evaluation of the microstructure of hybrid metal matrix composites was performed using a Scanning Electron Microscope (SEM) supported by Energy Dispersive Spectrometer (EDS) analysis. The results showed that the composites have a homogeneous structure without porosity and a very homogeneous distribution of fine γ-alumina (Al₂O₃) and copper particles. The sintering + forging process yielded a material with higher strength, hardness, and better resistance to wear. This composite is targeted for linkage applications where high toughness and high surface damage resistance are required.