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Microstructural evolution in ultrafine-grained titanium processed by high-pressure torsion under different pressures

Microstructural evolution in ultrafine-grained titanium processed by high-pressure torsion under different pressures
Microstructural evolution in ultrafine-grained titanium processed by high-pressure torsion under different pressures
A grade 2 commercially pure (CP) titanium was processed by high-pressure torsion (HPT) at pressures of 3.0 and 6.0 GPa in order to achieve improved strengths. The microhardness values for these Ti samples were plotted against the imposed strain, and the plots show that a higher saturation microhardness of 320 Hv is achieved for the sample processed at 6.0 GPa compared to a microhardness of 305 Hv when using a pressure of 3.0 GPa. The omega ?-phase has been reported in some earlier HPT investigations of pure titanium, but it was not detected in this investigation even after processing at 6.0 GPa. The absence of the ?-phase is attributed to the relatively high level of oxygen (0.25 wt%) in these CP titanium samples. The higher saturation hardness for the 6.0 GPa sample is consistent with the smaller average grain size of ~105 ± 12 nm compared with the measured grain size of ~130 ± 18 nm after processing with an imposed pressure of 3.0 GPa.
0022-2461
6558-6564
Wang, Chuan Ting
80ad9adf-a9df-49ed-934d-fa64505b920d
Fox, Alan G.
70ebcb0a-d38c-4bd9-9c64-ac36b7a3fe67
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Wang, Chuan Ting
80ad9adf-a9df-49ed-934d-fa64505b920d
Fox, Alan G.
70ebcb0a-d38c-4bd9-9c64-ac36b7a3fe67
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Wang, Chuan Ting, Fox, Alan G. and Langdon, Terence G. (2014) Microstructural evolution in ultrafine-grained titanium processed by high-pressure torsion under different pressures. Journal of Materials Science, 49 (19), 6558-6564. (doi:10.1007/s10853-014-8248-6).

Record type: Article

Abstract

A grade 2 commercially pure (CP) titanium was processed by high-pressure torsion (HPT) at pressures of 3.0 and 6.0 GPa in order to achieve improved strengths. The microhardness values for these Ti samples were plotted against the imposed strain, and the plots show that a higher saturation microhardness of 320 Hv is achieved for the sample processed at 6.0 GPa compared to a microhardness of 305 Hv when using a pressure of 3.0 GPa. The omega ?-phase has been reported in some earlier HPT investigations of pure titanium, but it was not detected in this investigation even after processing at 6.0 GPa. The absence of the ?-phase is attributed to the relatively high level of oxygen (0.25 wt%) in these CP titanium samples. The higher saturation hardness for the 6.0 GPa sample is consistent with the smaller average grain size of ~105 ± 12 nm compared with the measured grain size of ~130 ± 18 nm after processing with an imposed pressure of 3.0 GPa.

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More information

Accepted/In Press date: 3 May 2014
Published date: October 2014
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 368084
URI: http://eprints.soton.ac.uk/id/eprint/368084
ISSN: 0022-2461
PURE UUID: 04ddb59c-b5c3-4179-84a3-8fbf563c0e73
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 12 Sep 2014 14:40
Last modified: 15 Mar 2024 03:13

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Contributors

Author: Chuan Ting Wang
Author: Alan G. Fox

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