Effect of Chilled FSP on the Microstructure and Mechanical Properties of 7075 Aluminum Alloy

The FSP can be used as a generic process to modify the microstructure, refine the grains and change the composition, at selective locations. During FSP, the material that flows around the tool undergoes extreme levels of plastic deformation, that causes recrystallization and grain growth mechanism and is why the solid state processing technique that causes superplasticity. The nano grained alloy exhibited superplasticity at relatively lower temperatures and/or higher strain rates. In this research, FSP and cooling condition was used to create a microstructure with nano grains in a 7075 Aluminum alloy. Using cooling conditions don’t let grain growth, so can be achieved to nano grain structure. Cooling condition contains of alcohol, ice, dry ice and liquid nitrogen. Optimum ductility at an initial strain rate of 1 × 10−3 s−1 was obtained on the 500℃. Current results suggest that FSP and cooling system can be developed as a simple yet effective technique for producing microstructure amenable for superplasticity at high strain rates and/or lower temperatures.