Structure and mechanical properties of commercial purity titanium processed by ECAP at room temperature

Experiments were conducted on commercial purity titanium to evaluate the microstructure and mechanical properties after processing by equal-channel angular pressing (ECAP) at room temperature. Samples were successfully processed through 1 and 2 passes at two different pressing speeds using an ECAP die with a channel angle of 135 degrees. Following ECAP, a microstructural evaluation showed evidence for the occurrence of basal, prismatic and pyramidal slip together with {1 0 (1) over bar 2}<(1) over bar 0 1 1 > twinning. Hardness measurements confirmed the occurrence of homogeneous strengthening throughout the samples. Tensile testing revealed a high ultimate tensile strength of similar to 750 MPa after 2 passes of ECAP but with a reduction in the measured elongation to failure. (C) 2011 Elsevier B.V. All rights reserved.