Abstract
The effects of heat treatment (T6) on the microstructure and dry sliding wear behavior of Al- 15Mg2Si-3Cu particulate metal matrix composite (PMMC) with different contents of Zn have been investigated. The composite was characterized by scanning electron microscopy equipped with energy dispersive spectrometer (EDS). Dry sliding wear experiment was performed in a pin-on-disc wear tester against a DIN 100Cr6 steel disc at a speed of 220 rpm using normal load of 30N. Results show that increasing the Zn content causes a significant improvement in hardness. This is ascribed to the observed increase in matrix strength due to the formation of Al-Zn solid solution in the matrix. Zn was also found to be powerful in increasing wear resistance. The wear results showed that abrasion is the dominant wear mechanism in the composite containing 15 wt.% Zn, whilst a combination of adhesion and delamination appears to be the governing mechanism for as-cast composites.
Highlights
The sliding and rotating components such as brake drums, cylinder liners, pistons, cylinder blocks and connecting rods, intended to work in lubricating conditions may eventually end up working in semi-lubricated or dry conditions
Metal matrix composites (MMCs) reinforced with hard ceramic particles have emerged as a potential material especially for wear resistant and weight critical applications
The results indicate that: 1. The addition of Cu (3 wt.%) to the Al–15 wt.% Mg2Si composite introduces Cu rich intermetallics, mainly Q and θ phases
Summary
The sliding and rotating components such as brake drums, cylinder liners, pistons, cylinder blocks and connecting rods, intended to work in lubricating conditions may eventually end up working in semi-lubricated or dry conditions. This will result in higher operating temperature with increase in wear and lead to quicker replacement of components. Metal matrix composites (MMCs) reinforced with hard ceramic particles have emerged as a potential material especially for wear resistant and weight critical applications. These composites exhibit the ability to withstand high tensile and compressive stress by the transfer and distribution of the applied load from the ductile matrix to the reinforcement phase [1,2,3,4]
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