Micro-scratch Behavior of Friction Stir Processed Al-SiC Nanostructured Composites

In this research, friction stir processing (FSP) was successfully developed to fabricate Al-SiC nanostructured composites. Microstructural observations by scanning electron microscope indicated a proper distribution of SiC nanonparticles in Al matrix. Microscratch tests were carried out on friction stir processed Al-SiC nanostructured composites with normal loads of 1–4 N. Scratch grooves generated by the plastic deformation of surfaces were characterized for detailed friction and wear mechanisms investigation. The influence of normal load and SiC content on friction coefficient was also studied. It was found that the dominant wear mechanism transits from ploughing to micro-cutting with increasing the normal loads. A friction model for knowing the contribution of ploughing and adhesion components to friction is presented. This friction model is useful in understanding the friction mechanism of composites during scratching.

کلیدواژه ها:

Microscratch ، Friction stir processing ، Nanostructure ، Aluminum.