Microstructure and mechanical properties of Al/SiC composite surface layer produced by friction stir processing

Microstructural observations were carried out by employing both optical and scanning electron microscopy. In addition, the Electron Backscatter Diffraction (EBSD) technique was used to obtain crystallographic data as crystal orientation, grain size distribution and texture. The results have confirmed the refinement of grain produced in the nugget region of the processed alloy. On the other hand, although there is not an increase of hardness, surface composite layer presents better wear resistance than the aluminium base alloy as indicated by a lower specific wear rate (27%).