Processing of commercial purity titanium by ECAP using a 90 degrees die at room temperature

Authors: Zhao, X., Yang, X., Liu, X., Wang, C.T., Huang, Y. and Langdon, T.G.

Journal: Materials Science and Engineering: A

Volume: 607

Pages: 482-489

ISSN: 0921-5093

DOI: 10.1016/j.msea.2014.04.014

Abstract:

Experiments were conducted to determine whether it is feasible to process commercial purity (CP) titanium (grade 1) by equal-channel angular pressing (ECAP) at room temperature with a die having an internal angle of 90°. Billets were successfully processed through up to 4 passes using a pressing speed of 3.5mms-1. These results appear to represent the first successful processing of CP-Ti at room temperature using a 90° die. Processing by ECAP through 4 passes reduced the grain size from an initial value of ~25μm in the unprocessed condition to an equiaxed grain size of ~150nm. The results show that the hardness and tensile strength are increased significantly after ECAP and the material exhibits excellent elongations up to ~45% to 48% in tensile testing at room temperature. The success in processing CP-Ti at room temperature with a 90° die provides opportunities for incorporating additional processing steps in order to gain further grain refinement and strength enhancement. © 2014 Elsevier B.V.

Source: Scopus