Exprimental investigation of effect of material temperature and die profile on mechanical and metallurgical properties of 6061 Aluminum Alloy in Forward Thixoextrusion process

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Abstract

Two thixoforming process parameters like billet temperature and die profile were experimentally investigated on a commercial 6061 Aluminum alloy which is typically used in aerospace industries. The results show globular microstructure can be achieved using semisolid forming.The optimum semisolid material temperature was obtained in 620 °C by observing the microstructural and mechanical properties test results. It is important to notice that obtained results are at a condition that the post heat treatment process was not performed for thixoextruded parts but high elongation value was obtained at a suitable temperature of the semisolid material. Microstructural evaluation revealed that there is not important difference between specimens microstructure which were thixoformed at conic and curve dies, but according to tensile test result, it was exposed that thixoformed sample which was extruded by curve die has higher yield strenght and ultimate tensile strenght with higher elongation value and better ductility in comparison to another one because of higher residual stress resulted higher stress concentration in the conical die.

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References

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Journal of Solid and Fluid Mechanics
Volume 4, Issue 2 - Serial Number 2
May and June 2014
Pages 53-65

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