Scaling Up of Equal-Channel Angular Pressing and Its Effect on Mechanical Properties, Microstructure, and Hot Workability of AA 6061

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Equal-channel angular pressing (ECAP) was performed on aluminum 6061 billets with different cross-sectional areas to study the effect of scaling up on the mechanical properties, microstructure, and the hot workability of the alloy. In this study, annealed AA 6061 was subjected to severe plastic deformation at room temperature by ECAP (Route BC), producing 12.5 mm (0.5 in.), 50 mm (2.0 in.), and 100 mm (4.0 in.) square billets. The mechanical properties and microstructure of as pressed alloy were examined as a function of the extent of deformation and the cross-sectional area of the billets. Also, hot workability was determined by forging industrial parts at various temperatures. Results indicate that the average grain size after ECAP is of the order of 0.5 μm. This grain refinement resulted in enhanced hot workability at 315 °C (600 °F); indicating applicability of ECAP processed material in the forging industry.