Effect of processing parameters on fabrication of Al–Mg/Cu composites via friction stir processing

Investigation on AA5083/AA7075+Al2O3 Joint Fabricated by Friction Stir Welding: Characterizing Microstructure, Corrosion and Toughness Behavior

“…Formation of elliptical nugget zone was seen in the middle of the joint for all the samples. The shape of SZ depends on the processing parameters, tool geometry, work-piece temperature and thermal conductivity of the material 21 . Since the both nugget zones are extremely similar in appearance, it could be inferred that the addition of reinforcement particles does not have a major effect on the nugget's shape.…”

“…The main reason behind this phenomenon is the existence of reinforcement particles acting as nucleation sites. Moreover, they suppress grain boundaries movements and therefore limit grain coarsening which this phenomenon is known as pinning effect 21 . As a result of pinning effect along with dynamic recrystallization, more and smaller grains are formed within the SZ of Al 2 O 3 -included specimen.…”

Effect of tool pin profile on mechanical properties of Al6082 and Al6082-Cu composite by friction stir processing

“…Also at the given combination of rotational speed (1000rpm) and traverse speed (16mm/s), the eccentric stirring of square profile [10] became less effective compared to the whirling action of threaded cylindrical profile. The higher strengths of the composite specimens compared to the specimens processed without reinforcement is explained with the help of Orowan Theory [5,11]. According to Orowan theory, when the rotational speed increases, more intermetallic phases are formed.…”

“…The intense frictional heating and plastic deformation leads to formation of defect free, recrystallised and fine grained equiaxed microstructure. FSP performed on 5083Al using nano-sized Cu particles showed higher tensile strength, ultimate tensile strength, elongation and hardness than the base metal [5]. On a work with hybrid MMC using Al5083 plate with SiC and MoS 2 particles, the hardness and wear resistance properties were improved by FSP [6].…”

“…The samples processed without the Cu powder were defect free and the stir zone was characterised by equiaxed and finer grains due to severe plastic deformation and frictional heating leading to recrystallisation [5,8,9]. On the contrary, the specimens processed with the copper composite possessed groove defects and great particle agglomeration leading to non homogeneous properties inferior to that of the base metal.…”