Modeling and Experiments of Friction Stir Back Extrusion
By Mohammad Nazzal (American University of Sharjah), Obadah Jarrah (American University of Sharjah)

Friction Stir Back Extrusion (FSBE) is an energy efficient manufacturing process based on severe plastic deformation capable of producing fine grained, light weight tubular structures with excellent strength and toughness. In this work, the FSBE process is simulated using multi-physics based modeling to investigate the material flow, thermal cycle, and grain size in the produced tubes. Experimental verification is conducted to verify the multi-physics based model. The effects of rotational speed of the stirring tool, the axial feed rate, and the tool-die clearance on the FSBE process of Mg AZ31 tubes are investigated. A set of process parameters is recommended to produce fine grained tubes with high strength and toughness.