Abstract
The present paper deals with the study of microstructure and wear characteristics of TiB2 reinforced aluminium metal matrix composites (MMCs). Matrix alloys with 5, 10 and 15% of TiB2 were made using stir casting technique. Effect of sliding velocity on the wear behaviour and tribo-chemistry of the worn surfaces of both matrix and composites sliding against a EN24 steel disc has been investigated under dry conditions. A pin-on-disc wear testing machine was used to find the wear rate, in which EN24 steel disc was used as the counter face, loads of 10-60N in steps of 10N and speeds of 100, 200, 300, 400 and 500 rpm were employed. The results showed that the wear rate was increased with an increase in load and sliding speed for both the materials. However, a lower wear rate was obtained for MMCs when compared to the matrix alloys. The wear transition from slight to severe was presented at the critical applied loads. The transition loads for the MMCs were much higher than that of the matrix alloy. The transition loads were increased with increase in TiB2 and the same was decreased with the increase of sliding speeds. The SEM and EDS analyses were undertaken to demonstrate the effect of TiB2 particles on the wear mechanism for each conditions.
Highlights
Aluminium alloys are widely used in automotive, aerospace and mineral processing industries to make their products due to its excellent properties such as low density and high thermal conductivity [3, 4]
It is found from figures that the wear rate of both matrix alloy and composite specimens were increased with increase in applied load
A lower wear rate was obtained for the metal matrix composites (MMCs) alloy when compared with matrix alloy
Summary
Aluminium alloys are widely used in automotive, aerospace and mineral processing industries to make their products due to its excellent properties such as low density and high thermal conductivity [3, 4]. It has a poor wear resistance behaviour. Dry sliding wear characteristics of MMCs based on aluminium alloys have been studied by Basavarajappa et al [2], and abrasive wear behaviour by Rohatgi et al.[8]. The present study was attempted to improve the dry sliding wear behaviour of Al 6061 alloy reinforced with TiB2 at different loads and speeds. The worn surfaces were studied using scanning electron microscopy and the results are reported in this paper
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