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

Zhao, Xicheng, Yang, Xirong, Liu, Xiaoyan, Wang, Chuan Ting, Huang, Yi and Langdon, Terence G. (2014) Processing of commercial purity titanium by ECAP using a 90 degrees die at room temperature. Materials Science and Engineering: A, 607, 482-489. (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 3.5 mm s?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 ~25 µm in the unprocessed condition to an equiaxed grain size of ~150 nm. The results show that the hardness and tensile strength are increased significantly after ECAP and the material exhibits excellent elongations up to ~45%–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

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Contributors

Author: Yi Huang

Author: Terence G. Langdon

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