Preparing surface composite of AA5086 SiC by friction stir processing

Abstract EN

Friction stir processing (FSP) is a novel solid state process to produce surface composite.

In this study, FSP was applied to produce surface composite for (AA5086) matrix reinforced with Silicon Carbide (SiC) particles .

FSP tool of flat shoulder in diameter (18mm) and cylindrical pin with threaded profile in diameter (6mm), length (2.5 mm) was fabricated.

The groove cut on the surface of base metal in (2mm) depth, (2.5mm) width, then groove filled with reinforcement particles.

The process carried out at various rotational speed (500, 1000, 1600 rpm) and constant traveling speed (30)mm/min.

Optical microscopy and scanning electron microscopy (SEM) are used to analysis the microstructure.

Furthermore, the wear properties of the surface composites were evaluated by using a pin on disc wear test at room temperature at normal loads of ( 10,15, and 20 N).

The results showed that microhardness profile along top surface improved after FSP) and the maximum microhardness evaluated at rotational speed (1000 rpm)for (AA5086) reinforced by (SiC) particles in three passes.

The microhardness increased to (150 HV) as compared with the micro-hardness of the base metal (94HV).

The practical purpose of this work is to improve the surface wear resistance by developing a layer of ceramic composite on the surface of (AA5086) .