Comprehensive investigation of the impact of milling time on microstructural evolution and tribological properties in Mg-Ti-SiC hybrid composites

Abstract

This research delves into the effects of milling time on the properties of Mg-Ti dual matrix composites reinforced with nano SiC powders, processed via spark plasma sintering. The study, driven by the need for advanced materials with enhanced wear resistance for the aerospace and automotive sectors, focuses on microstructural evolution and wear characteristics. It aims to understand how varying milling durations influence particle morphology, crystallite structure, and consequently, tribological behavior. Initial observations indicate a decrease in average particle size to 5.72 µm, followed by an increase to 14.83 µm due to cold welding and particle trapping, demonstrating the dynamic nature of particle morphology under different milling conditions. X-ray diffraction analysis reveals a notable reduction in magnesium's crystallite size with increased milling, suggesting plastic deformation. This study underscores that smaller crystallite sizes do not always correlate with strain, especially in smaller dimensions. Additionally, the research records variations in density and hardness, influenced by milling time and particle dispersion, with hardness showing a complex variation, peaking at 108 HV. Overall, the findings highlight the critical role of milling duration in shaping the microstructure and determining the mechanical and wear properties of Mg-Ti-SiC composites. This investigation contributes to the optimization of wear resistance in these composites, enhancing their applicability in high-performance industrial applications.