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Processing and characterization of nanostructured Grade 2 Ti processed by combination of warm isothermal ECAP and extrusion

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journal contribution
posted on 10.08.2017, 13:21 by Mahroo Eftekhari, Ghader Faraji, S. Nikbakht, R. Rashed, R. Sharifzadeh, R. Hildyard, Mahdi Mohammadpour
In this study, combined multi pass equal channel angular pressing (ECAP), and subsequent warm extrusion at different temperatures are performed on commercial purity titanium. Mechanical and microstructural evolutions are then investigated. Since it was observed that the four passes ECAP processed sample showed the best strength and reasonable elongation, this sample was selected for studying the extrusion temperature effects on the structure and mechanical properties of Grade 2 titanium. Therefore, the 4th passes ECAP processed sample was extruded at different temperatures of 300 °C, 350 °C, 400 °C, 450 °C and 500 °C. The result revealed that the best mechanical properties were achieved from the specimen processed by four passes ECAP followed by warm extrusion at 300 °C. The strength, and hardness of this sample were considerably improved in comparison with that of the unprocessed sample. Also, its ultra-fine grained and nanograined microstructure were homogeneous, with a grain size ranged from 40 to 200 nm with an average grain size of about 123 nm. It was seen that the mechanical properties of some samples after applying this combined process (ECAP + warm extrusion) are comparable with those of Grade 5 titanium which is commonly used in medical applications but contains alloying elements that are toxic to human health.

Funding

This work was financially supported by Iran National Science Foundation (INSF).

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Materials Science and Engineering: A

Volume

703

Pages

551-558

Citation

EFTEKHARI, M. ... et al, 2017. Processing and characterization of nanostructured Grade 2 Ti processed by combination of warm isothermal ECAP and extrusion. Materials Science and Engineering: A, 703, pp. 551-558.

Publisher

© Elsevier

Version

AM (Accepted Manuscript)

Publisher statement

This paper was accepted for publication in the journal Materials Science and Engineering: A and the definitive published version is available at https://doi.org/10.1016/j.msea.2017.07.088

Acceptance date

27/07/2017

Publication date

2017-07-29

Copyright date

2017

ISSN

0921-5093

Language

en