## 2 Review Available Literature
### AA5083-Based MMCs
After dynamic recrystallization, TEM and EBSD investigations showed a dislocation rearranged to create high-angle grain boundaries, and equiaxed recrystallized microstructure, respectively. Multiple passes resulted in a generally poor texture intensity over the stir zone of FSPed samples. By incorporating carbon-nanotube/silicon-carbide particles into the AA5083 base material, the Zener-Holloman and particle-stimulated nucleation mechanisms were activated, resulting in the formation of randomly oriented grains. Silicon-carbide particles are uniformly disseminated with good interfacial bonding in FSPed composites, and carbon nanotubes are partly reacted with an AA5083 material to generate an in situ Al4C3 intermetallic compound. The maximal UTS of the AA5083-CNTs/SiC hybrid composite is 361 Mpa, while the tensile strength of the base material is 298 Mpa. On the fracture surface of the SiC-reinforced composite, the voids initiating at the matrix-particleinterface areas were observed. Hardness testing revealed that AA5083/SiCasSiCs had the highest difference in hardness, 1.5 times that of the base material. AA5083/SiCasSiCs also had a greater hardness and elastic modulus. The hybrid composite increases hardness by 1.4 times. [PERSON] et al. [55] evaluated the influence of FSP on the surface of AA5083 using graphene oxide as a reinforcing material. A surface nanocomposite formed of graphene oxide was created utilizing FSP in a liquid-cooled condition to enhance the AA5083's microstructural and mechanical properties. To accomplish this, FSP was employed to do up to three passes on a parental material with and without reinforcing particles. The friction-stir-processed AA5083, the base material, and the resulting surface nanocomposite's microstructural and mechanical properties were examined. With the use of electron backscatter diffraction, the microstructure was examined. After processing, the nanocomposite's grain size was found to be around 1 \(\upmu\)m. The base material's grain size was 23 \(\pm\) 2.3 \(\upmu\)m, but the specimen's grain size without reinforcement was 6 \(\pm\) 1.1 \(\upmu\)m. This discrepancy was mostly caused by the considerable impact of the reinforcing particles on grain formation in the nanocomposite specimen. According to research on the mechanical properties of the parental material, nanocomposite, and FSPed specimen, applying a cooling environment while performing the procedure increases the microhardness of the stir zone in comparison to the parental material. In the presence of graphene oxide particles, the microhardness increased to 123 1.7 HV. In terms of tensile properties, the nanocomposite performed better than the parent material and the FSPed sample. [PERSON] et al. [56] created AA5083-CNT composites by friction stir processing to study the effects of grain refinement and carbon nanotubes on corrosion and mechanical properties. FSP dispersed CNT into AA5083 to create a metal matrix composite in the current study. In the stir zone, microstructural investigations indicated smaller grains and nonuniform CNT dispersion. The small grains and presence of CNT in the composite led to a 25% improvement in hardness when compared to unprocessed aluminium alloy, which is connected to the fine grains and presence of CNT in the composite. According to the electrochemical tests, the FSPed composite showed a somewhat higher corrosion resistance. The findings reveal that the addition of CNT, in combination with the grain size effect, has a considerable impact on the corrosion resistance of AA5083. Based on the findings, it can be concluded that adding CNT to AA5083 through FSP can increase mechanical performance. However, care must be taken to enhance CNT dispersion, since the presence of CNT has a significant impact on corrosion resistance. It was discovered that employing FSP to produce AA5083-CNT composites allows for the construction of lightweight energy-efficient structures with high mechanical properties and corrosion resistance. [PERSON] et al.