Experimental Investigations on Microstructure of Equal Channel Angular Pressed Aluminum Alloys at Different Die Angles

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.