Effect of III-Pass on Microstructure, Micro Hardness and Static Immersion Corrosion Resistance of AA6061-T6/SiCp Surface Composite Fabricated by Friction Stir Processing

In this current investigation, SiC particles 20μm in average size were incorporated into the commercially AA6061-T6 to prepare surface composite by using Friction stir processing (FSP). The morphology of the reinforcement inside the Al matrix has been evaluated from scanning electron microscope (SEM) and the corrosion characteristics of the resulted composite were evaluated using static immersion corrosion (SIC) behavior in 3.5% NaCl aqueous solution at various regimes. From the results, it observed that the SiC particles were distributed uniformly inside the stir zone (SZ) in both first and third-pass of FSP. The micro hardness of stir zone with SiC particles of I-pass was higher compared to III-pass and as-received Al alloy. In static immersion corrosion test the FSP AA6061-T6/SiCp exhibited significantly greater corrosion resistance in I-pass than compared to the III-pass and as-received Al alloy

Tensilel Properties of AA6061-T6/SiCp Surface Metal Matrix Composite Produced By Friction Stir Processing

In this experiment, Friction stir process (FSP) was attempted to incorporate micron-sized SiC particles 20μm in average size into the commercially AA6061-T6 to form surface particulate metal matrix composite. Microstructure observations were carried out by scanning electron microscope (SEM) in the nugget zone. Mechanical properties include micro hardness behavior and tensile properties were evaluated. From the results, SEM microstructure shows that the SiC particles are uniformly distributed in nugget zone without any defect. The micro hardness of nugget zone with SiC particles is higher than the as-received Al alloy. Tensile properties of the FSPed composite were reduced as compared to the as-received Al alloy