EFFECT OF PIN VOLUME RATIO ON MICROSTRUCTURAL CHARACTERISTICS OF FRICTION STIR PROCESSED ALUMINIUM BASED METAL MATRIX COMPOSITE
Keywords:
Friction Stir Processing, Pin Volume Ratio, MicrostructureAbstract
FSW was invented at the welding institute (TWI) of the United Kingdom in 1991 as a solid-state joining technique and was initially applied to aluminium alloys. Friction Stir Processing (FSP) is an adaptation of friction stir welding with the following unique features. Low amount of heat generation, extensive plastic flow of material, very fine grain size in the stirred zone, healing of flaws and casting porosity, random misoientation of grain boundaries in the stirred region, mechanical mixing of the surface and subsurface layers, Therefore, the FSP can be used as a generic process to modify the microstructure and change the composition, at selective location. In FSP,the effect of pin profile on material flow, material mixing, material consolidation in predominant than other parameters.Hence, Inthis work, the effect of pin volume ratio (dynamic volume/static volume) on microstructural characteristics of aluminium based metal matrixcomposites was characterized. Microhardness of FSP region was measured and correlated with respective microstructural characteristics. From this investigation it is found that pin volume ratio of 1.15exhibited defect free stir zone with higher hardness compared to other ratios. The reasons for the above effects are discussed in detail in this paper.
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