Abstract:A review on severe plastic deformation (SPD) technique of equal channel angular pressing (ECAP) process of commercially pure titanium (CP-Ti) alloys was presented with a major emphasize on the influence of ECAP parameters that include channel and curvature angles, processing route, temperature of operation, pressing speed, internal heating, number of pass through the die and back pressure. Various ECAP characteristics such as microstructure, strain inhomogeneity and mechanical properties are considered to achieve the maximum homogeneity, equilibrium grain refinement and mechanical improvement of CP-Ti. Investigations show that a pressing speed of 1-3 mm/s at 450 °C with route B_C along with channel and curvature angles of 90° 12擄''''> and 20° respectively with backpressure can lead to the most homogeneous ultrafine microstructure.

Key words: equal channel angular pressing (ECAP); commercially pure titanium (CP-Ti); backpressure; channel angle; curvature angle; pressing speed