A novel single pass severe plastic deformation technique: Vortex extrusion

Vortex extrusion (VE) is a new severe plastic deformation (SPD) method which is designed to introduce a specific amount of torsional strain to a material simultaneously being extruded using a specially designed stationary die. Plastic deformation characteristics of VE were analyzed by finite element analysis; processing loads, strain values as well as metal flow patterns were studied for different twist angles. Results indicated that high strain values with uniform distribution may be achieved after VE processing. Therefore, VE can be considered as a promising single pass SPD technique which can be installed on any standard extrusion equipment with no need to any additional facilities that are essential in similar method, torsion extrusion. (C) 2011 Elsevier B.V. All rights reserved.