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2 Materials Science Poland

2 2006

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Sliding wear, slurry erosive wear and corrosive wear behavior of aluminium/SiC composite

Ramachandra M., Radhakrishna K.

Materials Science Poland

2006

Vol. 24, No. 2/1

333--349

In this study, an aluminium based metal matrix was reinforced with silicon carbide (SiC) particulates using a conventional casting technique, Vortex method. Macro and microstructural studies conducted on the samples revealed a near uniform distribution of SiC particulates. Sliding wear, slurry erosive wear and corrosive wear of the as cast metal matrix composite (MMC) were studied and found that sliding wear and slurry erosive wear resistance improved considerably with the addition of SiC. Whereas corrosion resistance has decreased with addition of SiC particles. The microscopic examination of the worn surfaces, wear debris and subsurface shows that the base alloy wears primarily because of micro cutting. But the MMC's wear because of micro cutting, oxidation, plastic deformation and thermal softening. In slurry erosive wear the formation of passive layer has retarded the wear of the material. It is observed that pitting corrosion was the dominant corrosion mechanism. The bulk hardness has increased with the increase in percentage of SiC particulates. There was no much change in the density of MMC's compared to base metal.

Dry sliding wear behavior of Al2219/SiCp metal matrix composites

Basavarajappa S., Chandramohan G., Subramanian R., Chandrasekar A.

Materials Science Poland

2006

Vol. 24, No. 2/1

357--366

The present study deals with investigations relating to dry sliding wear behaviour of Al 2219 alloy, reinforced with SiC particles of 0-15 weight percent in steps of 5. The unlubricated pin-on disc tests were conducted to examine the wear behavior of the aluminium alloy and its composites. The tests were conducted at varying load from 0 to 60 N and sliding speed of 1.53m/s, 3m/s 4.6m/s and 6.1m/s for a constant sliding distance of 5000 meters. The result showed that wear rates of the composites are lower than that of the matrix alloy and further decreased with the increase in SiCp content. As the load increases further cracking of SiCp particle occurs and a combination of abrasion, delamination and adhesive wear were observed. The samples were examined using scanning electronic microscope after wear testing and analyzed.