International Journal of Engineering Research

S. V. Narsimha Rao ¹, M. Manzoor Hussain ², S. Rajesham ³

Affiliations
1 MVSR Engineering College, Nadergul – 501510, IN
2 JNTUH CES, Sultanpur, Medak, IN
3 TKR Engineering College, Medbowli, Hyderabad, IN

Abstract

Equal channel angular Pressing (ECAP) is at present one of the most promising technique to produce bulk nanostructured or ultra fine-grained materials .ECAP is a severe plastic deformation process where a material is extruded through a channel that intersect at an angle. As the material crosses the channel's intersection, the material is deformed by simple shear and the billet accumulates deformation. The channel of the die are manufactured with approximately the same cross-section. As the cross-section at the entrance and exit is equal, the billet dimension does not change when the part is extruded.In the present work, AA7075 aluminum alloys are processed through ECAP dies with various channel angles at room temperature. After deformation, all the pressed samples are subjected to microstructure test. The results showed improved grain orientation of the ultra-fine grained aluminum alloy that is developed. The results are compared with the microstructure of pure aluminium billet . This research provides an opportunity to examine the significance of the ECAP process for aluminum alloys on microstructure.

Keywords

ECAP, AA7075, Microstructure.

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M. V. Kishore ¹, D. Hanumantha Rao ², M. Manzoor Hussain ³

Affiliations
1 Department of Mechanical Engineering, Matrusri Engineering College, Saidabad, Hyderabad, IN
2 Matrusri Engineering College, Saidabad, Hyderabad, IN
3 Jawaharlal Nehru Technological University, Hyderabad, IN

Abstract

The term fluidity refers to the ability of a material to flow before it solidifies. This is a very significant factor which will determine the filling up of castings with complex and intricate shapes. Mould filling ability is a parameter that is used to determine the fluidity of a material in conventional castings. At semisolid temperatures the metal exists in the form of slurry. Hence fluidity of the material in the freezing range is very important. In the present study numerical simulations are carried out to determine the mould filling ability values and compared with casting fluidity parameter. The process parameters that were used in the simulations include billet temperature, ram speed and preheating of die.

Keywords

Semisolid Metal Processing, Mold Filling Ability, Aluminium Alloy, Numerical Simulation.

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