Compression tests to approximate the ECAP deformation and post-processing of coarse-grained and nanospd grade 2 titanium

Ultrafine-grained and nanoscaled CP-Ti exhibits extraordinary mechanical properties. A tremendous increase in strength and parallel in ductility can be achieved by an increasing number of Equal Channel Angular Pressing (ECAP) passes. The in-situ stress-strain behaviour of the post-deformation by compression is studied using hardening plots to illustrate especially the hardening stages II and IV. Different crack types appear during compression of differently SPD pre-strained samples at room temperature. They are analysed in context with the known tensile plastic behaviour from previous results. Within the equal forming limit, the ECAP process is approximated by uniaxial compression tests at elevated temperatures.