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Title: Processing and characterization of nanostructured Grade 2 Ti processed by combination of warm isothermal ECAP and extrusion
Authors: Eftekhari, Mahroo
Faraji, Ghader
Nikbakht, S.
Rashed, R.
Sharifzadeh, R.
Hildyard, R.
Mohammadpour, Mahdi
Keywords: Warm ECAP
Warm extrusion
Pure Ti
Mechanical properties
SEM
TEM
Issue Date: 2017
Publisher: © Elsevier
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.
Abstract: 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.
Description: This paper is closed access until 29th July 2018.
Sponsor: This work was financially supported by Iran National Science Foundation (INSF).
Version: Accepted for publication
DOI: 10.1016/j.msea.2017.07.088
URI: https://dspace.lboro.ac.uk/2134/26011
Publisher Link: https://doi.org/10.1016/j.msea.2017.07.088
ISSN: 0921-5093
Appears in Collections:Closed Access (Mechanical, Electrical and Manufacturing Engineering)

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