The ever increasing service necessities in industries like automobile and aerospace demands the engineers to use the aluminium based composites which are reinforced by either single or mixture of ceramic particles. When hybrid reinforcements are used, the resulting composites are having superior mechanical properties. In the present experimental work, the Al 5083 was reinforced by Titanium oxide and aluminium oxide to the depth of 2mm and processed by solid state friction stir processing technique. To prepare the surface composites, three non-consumable rotating tools were used with different tool pin profile such as square, straight cylinder and taper cylinder. The other parameters like tool rotational speed, tool traverse speed, number of passes were maintained uniform. Totally three workpieces were processed in order to inspect the ultimate tensile strength, yield strength and micro hardness. The test results shown that the square tool pin has delivered the highest strength and hardness than the other tool pin profile. The micro hardness test results showed that the hardness of the reinforced zone is higher than unreinforced region.
Friction stir processing is a modified form of friction stir welding process which is introduced to prepare the surface composites or to repair the defects in the surface to enhance the mechanical properties. The process is a green and environmental friendly process, where the required heat is produced by frictional action. In the present work, Surface composites were prepared using Al 5052 as base material and Al2O3 as reinforcement particles. Parameters such as number of passes, spindle speed, feed rate and tool pin profile were taken in three different levels. Six tools were made, three tools with 3:1 and remaining three with 4:1 D to d ratio. Totally 18 experiments were conducted with two group of tools. The results were analyzed to study the influence of above mentioned parameters on mechanical properties like tensile strength, hardness. The results were compared for different D/d ratios. The experimental results revealed that 3:1 D/d ratio tools were given better results than 4:1.Tool with square pin profile given better hardness and strength than the other profiles. This is because of the pulsating effect of the square pin profile. The other parameters have directly proportional relationship up to certain level, after which further increase of parameters reduces the tensile strength and hardness.
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