Friction stir welding/processing of metals and alloys: A comprehensive review on microstructural evolution

Surface composites by friction stir processing: A review

Friction stir based welding and processing technologies - processes, parameters, microstructures and applications: A review

Investigating effects of process parameters on microstructural and mechanical properties of Al5052/SiC metal matrix composite fabricated via friction stir processing

Improved surface properties with the retainment of bulk properties are necessary for a component for enhanced wear characteristics. Friction stir processing (FSP) is used to produce such surface composites. Fabrication of 5083 aluminum alloy with reinforced layers of boron carbide (B 4 C) through FSP was carried out. Micro and nano sized B 4 C particles were used as reinforcements. The friction processed surface composite layer was analyzed through optical and scanning electron microscopical studies. The number of passes and the size of reinforcement play a vital role in the development of surface composites by FSP. Mechanical properties of the friction stir processed surface composites were evaluated through micro hardness and universal tensile tests. The results were compared with the properties of the base metal. The role of reinforcement and number of passes on properties were also evaluated. Tribological performance of the surface composites is tested through pin on disk test. The surface composite layer resulted in three passes with nano particle reinforcement exhibited better properties in hardness, tensile behavior and wear resistance compared to the behavior of the base metal.

Fabrication of Al5083/B4C surface composite by friction stir processing and its tribological characterization

Aluminium based in situ composites have many advantages over their conventional counterparts. However, a major problem in such composites is the segregation of the in situ formed particles at the grain boundaries. In this study, it has been shown for the first time that friction stir processing (FSP) can be used effectively to homogenise the particle distribution in Al based in situ composites. An Al-5 wt.% TiC composite was processed in situ using a mixture of K 2 TiF 6 and graphite powders in aluminium melt. Friction stir processing was employed on the as-cast composite to uniformly distribute the TiC particles in the Al matrix. The composite was subjected to single and double pass FSP and its effect on the microstructure and properties was evaluated. A single pass of FSP was enough to break the particle segregation from the grain boundaries and improve the distribution. Two passes of FSP resulted in complete homogenization and elimination of casting defects. The grain size was also refined after each FSP pass. This led to significant improvement in the mechanical properties. The novel feature of the composite is that while the strength and hardness improved substantially after FSP, the ductility was not compromised.

Effect of friction stir processing (FSP) on microstructure and properties of Al–TiC in situ composite

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Effect of friction stir processing (FSP) on microstructure and properties of Al–TiC in situ composite