SURFACE MODIFICATION OF AA 7075-T651 PLATE USING FRICTION STIR PROCESSING WITH SIC PARTICLES

In the present work, composite surface based on AA 7075-T651 matrix reinforced with micro-sized particles of silicon carbide (SiC) has been fabricated by Friction stir processing (FSP). The micorhardness of the processed surface has been investigated and compared with that of base alloy AA 7075-T651. It is found that the friction stir processed sample possesses higher hardness than that of AA 7075-T651. The Addition of SiC was done using the direct method through holes in shoulder face. A new tool design has been manufactured for this study. A hollow tool used as a reservoir for ceramic powder. Two holes in shoulder face used to insert the ceramic powder from the cavity to processing zone. A mechanical system is been used to pressed ceramic powder through holes. The maximum hardness is 211 HV was observed at 1460 rpm, rotating speed 60 mm/min, traveling speed with particle size 3.5 μm for SiC.