## 2 Review Available Literature
### AA5083-Based MMCs
This had a substantial influence on the ultimate mechanical properties. To compensate for material loss, it was determined that sinking reinforcement in the parental material was required. It was observed that if the material loss in the form of a cavity for reinforcements is not compensated for, a higher empty volume leads to a decrease in mechanical properties. A 10 mm inter-cavity spacing made it possible to achieve the greatest reinforcement sinking and the smallest amount of clustering when using carbon nanotubes in single-pass friction stir processing. [PERSON] et al. [52] looked at the mechanical characteristics, sliding wear behaviour, and microstructure when fabricating AA5083-B4C/SiC/TiC surface composites using FSP. In this investigation, FSP was used to produce three distinct AA5083 surface composites reinforced with TiC, B4C, and SiC particles. Three sequential FSP passes and the mechanical properties of reinforced particles were studied. A tool tilt angle of 3\({}^{\circ}\), a transverse rate of 25 mm/min, several passes, and a rotating speed of 1600 rpm were selected based on experimental tests to provide a sound FSP area and homogenous particle dispersion in the stirred zone. The FSPed sample's mechanical properties were assessed and compared to the parental material. With dense particulate distribution on both the advancing and retreating sides of the stir region, as well as particle-free zones and strong particle-matrix bonding in some places, the microstructure revealed substantial grain refinement. FSP induces significant plastic deformation in the materials, allowing the constituent phase to mix and refine. The FSPed sample's wear resistance was assessed and compared to the parental material. The inclusion of TiC, B4C, and silicon carbide particles in the parental material (AA5083) improves wear properties, according to the findings. The findings showed that the wear mode changed from abrasive to delamination when a pin-on-disc tribometer was used to examine the wear mechanism. Furthermore, the findings show that adding TiC, B4C, and SiC particles to the parental material improves the tensile properties while also enhancing its hardness. The fracture mode of SiC- and TiC-particle-reinforced surface composites was found to be ductile, whereas the fracture mode of B4C reinforced surface composites was found to be bimodal. When compared to the AA5083-SiC/TiC composite, the UTS and microhardness of the AA5083-B4C composite were 349 MPa and 132.56 \(\pm\) 2.52 Hv, respectively. The AA5083-B4C composite has a minimum wear rate of 18 \(\times\) 10\({}^{-5}\) mm\({}^{3}\)/Nm. [PERSON] and [PERSON] [53] used FSP to investigate the production and strength behaviour of an MWCNT-reinforced AA5083 composite. MWCNTs were included in AA5083 through FSP to boost the strength of the alloy, which is used in a range of industries. The FSP approach was used to successfully produce the AA5083-MWCNT composites. In comparison to the base material, the composite grain size was improved greatly. The composites have no voids or other faults under FSP-optimized settings. The grain refining and uniform distribution of MWCNTs were accomplished due to a composite powder composed of MWCNTs and AA5083. While the UTS increased from 13 to 16 percent, the proof stresses of the composite ranged from 53 to 61 percent higher than those of the base material. [PERSON] et al. [54] employed friction stir processing to develop and analyse AA5083-CNTs/SiC composites. To make hybrid and mono composites, AA5083 base material was reinforced with CNT and micron-sized SiC particles by FSP. In both individual and aggregate forms, the impact of CNTs/SiC on the texture, mechanical properties, and microstructural development texture of FSPed AA5083 composites was examined. All of the samples were subjected to three passes of homogeneous reinforcement dispersion at a transverse speed of 20 mm/min and a rotating speed of 1600 rpm. For comparison, FSP was performed on a parental material without reinforcement under similar experimental conditions.