article · Journal of Materials Research and Technology
This study investigated magnesium metal matrix composites reinforced with titanium and silicon carbide particles, fabricated using ball milling and spark plasma sintering. Four different compositions were examined to understand their mechanical properties and wear behaviour. The addition of silicon carbide particles improved grain refinement and phase formation. However, increasing silicon carbide content also led to higher porosity, which negatively impacted some properties. Composite NC, containing 10 wt% silicon carbide, showed the highest hardness at 137 HV and demonstrated good wear resistance with stable coefficient of friction values. In contrast, Composite A, with only titanium reinforcement, exhibited the lowest porosity, lowest weight loss during wear, and the most stable coefficient of friction. The findings highlight the complex interplay between reinforcement content, porosity, and mechanical performance in these magnesium composites.
Understanding how to improve the mechanical properties and wear resistance of magnesium composites is important. These materials are lightweight and could be used in applications where strength and durability are crucial, potentially leading to more efficient and longer-lasting components in various industries.
This early-stage research explores material properties, specifically mechanical strength and wear resistance, of magnesium composites. Such materials could potentially be used in lightweight structural components for industries like automotive or aerospace, where reduced weight and improved durability are beneficial. However, the abstract does not indicate a specific application pathway or readiness level beyond fundamental material characterisation.
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This study examines the mechanical properties and wear mechanisms of magnesium (Mg) metal matrix composites reinforced with titanium (Ti) and silicon carbide (SiC) particles. Three different composite formulations were investigated: Mg-30 wt% Ti (A), Mg-25 wt% Ti-5 wt.% SiC (NB), Mg-20 wt% Ti-10 wt% SiC (NC), and Mg-15 wt% Ti-15 wt% SiC (ND). These composites were fabricated through ball milling and spark plasma sintering (SPS). The incorporation of SiC particles significantly enhanced grain refinement and phase formation within the composites. Density analysis revealed that the actual densities of the composites were lower than the theoretical values, with Composite A exhibiting the highest actual density of 2.15 g/cm³ and the lowest porosity of 16.31%. The introduction of SiC particles increased porosity, with Composite NB displaying the highest porosity at 30.58%. Hardness testing indicated that Composite NC, containing 10 wt% SiC, achieved the highest hardness of 137 HV. In contrast, Composite ND, with 15 wt% SiC, showed a reduced hardness of 115 HV, attributed to increased porosity and potential SiC particle agglomeration. Wear behavior was evaluated using a pin-on-disc tribometer. Weight loss measurements indicated that Composite A had the lowest weight loss (1.1–2.1 mg), while Composite NB experienced the highest weight loss (2.8–8.3 mg) due to increased porosity. Composite NC demonstrated a balance with moderate weight loss (2.0–3.8 mg). The coefficient of friction (COF) varied with SiC content and applied loads (2, 4, and 8 N), with Composite A demonstrating the lowest COF values (2.3–2.8) and stable performance across different loads. Composite NB exhibited higher COF values (3.5–4) and significant fluctuations due to elevated porosity and the presence of SiC particles. Composite NC showed better wear resistance and more stable COF values (2.5–2.9) compared to NB and ND.
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DOI: 10.1016/j.jmrt.2024.07.125
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