Abstract
Several deposition methods have been proposed for pre-deposition of reinforcement particle for preparation of surface metal matrix composite by Friction Stir Process. The method, which will effectively and homogeneously spread the reinforcement within processed zone, will be considered as best possible method.Homogeneous volumetric metal matrix composites can be fabricated by conventional casting and modified stir casting methods. Friction stir process (FSP) can be used as one of the best technique to fabricate surface modified metal matrix composites. In this research article, silicon carbide and graphite powder are used as reinforced materials and AA6061 is used as parent metal matrix material. FSP which is a versatile surface composite preparation technique is applied for fabrication of surface composite. Herein, single channel, multi-channel and perforated holes methods have been utilized for reinforcement deposition. As per the results, perforated blind holes method is reported as best method of pre deposition of powders. Finally, array of holes for pre-deposition of reinforcement powder improves approx 25% in ultimate tensile strength , 40% in micro-hardness and appreciable grain refinement are observed in metal matrix composite processed by FSP as compared to as received alloy.
Highlights
Whenever designer explore about the light weight, sufficiently strong and good wearable material, Aluminium alloys fits as per the requirements [1]
Little improvement in hardness of Heat Affected Zone (HAZ) noticed due to heating and quick cooling, which is limited to the range of few mm
When silicon carbide (SiC) nano particles were reinforced in base metal along the stir zone by pre-depositing in an array of hole methods, a great improvement in microhardness is observed within stir zone
Summary
Whenever designer explore about the light weight, sufficiently strong and good wearable material, Aluminium alloys fits as per the requirements [1]. During FSP, the near surface layer of the component is subjected to an intense localized heating and due to significant frictional heating and simultaneous stirring of plasticized metal, plastic deformation takes place. This phenomenon replaces the existing microstructure with fine,equi-axes grains. No comparison between different methods for depositing reinforcement particulate prior to processing has been reported, which might play an important role in the modification of prepared samples of surface MMC. The present work is aimed to investigate the suitability of the way of reinforcement powder deposition and the effect of methodology on mechanical and metallurgical properties of fabricated surface MMC.
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