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Mechanical behavior and impact toughness of the ultrafine-grained Grade 5 Ti alloy processed by ECAP

Mechanical behavior and impact toughness of the ultrafine-grained Grade 5 Ti alloy processed by ECAP
Mechanical behavior and impact toughness of the ultrafine-grained Grade 5 Ti alloy processed by ECAP
This paper reports on a study of the relationship between microstructure, mechanical behavior and impact toughness of the UFG Grade 5 Ti alloy. The mechanical behavior and impact toughness of the Grade 5 Ti alloy in a coarse-grained state, and in an ultrafine-grained (UFG) state produced by equal-channel angular pressing (ECAP) with subsequent deformation-and-thermal treatments via extrusion and warm upsetting in isothermal conditions, were studied extensively. It is shown that a strong refinement of α-grains (less than 250 nm) in the alloy by ECAP and extrusion leads to high strength but with low values of the uniform elongation and lower impact toughness. It is demonstrated that, in order to increase the impact toughness of UFG Ti alloys, it is possible to use approaches realizing ductility enhancement associated with an increase of the strain hardening capacity. An enhancement in the impact toughness of the UFG alloy through an increase in the uniform tensile elongation of the sample is achieved by the preservation of the ultrafine size of α-grains (about 800 nm) with predominantly high-angle boundaries and a decrease in the dislocation density due to recovery and dynamic recrystallization during warm upsetting.
0921-5093
166-173
Semenova, Irina P
bfc9939a-3694-413a-89dc-08df2714b681
Ployakov, Alex V
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Polyakova, Veronika V
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Grishina, Yu F
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Huang, Yi
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Valiev, Ruslan Z
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Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Semenova, Irina P
bfc9939a-3694-413a-89dc-08df2714b681
Ployakov, Alex V
9a435d9b-834e-4658-af0e-cee170067f4f
Polyakova, Veronika V
6f6fdf12-d1fc-423c-9794-bdee983979b9
Grishina, Yu F
42a031bb-519c-439e-9c07-b472a6321192
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Valiev, Ruslan Z
ede7fb12-54a3-4d6f-a1a7-f04cc6549934
Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Semenova, Irina P, Ployakov, Alex V, Polyakova, Veronika V, Grishina, Yu F, Huang, Yi, Valiev, Ruslan Z and Langdon, Terence G (2017) Mechanical behavior and impact toughness of the ultrafine-grained Grade 5 Ti alloy processed by ECAP. Materials Science and Engineering: A, 696, 166-173. (doi:10.1016/j.msea.2017.04.073).

Record type: Article

Abstract

This paper reports on a study of the relationship between microstructure, mechanical behavior and impact toughness of the UFG Grade 5 Ti alloy. The mechanical behavior and impact toughness of the Grade 5 Ti alloy in a coarse-grained state, and in an ultrafine-grained (UFG) state produced by equal-channel angular pressing (ECAP) with subsequent deformation-and-thermal treatments via extrusion and warm upsetting in isothermal conditions, were studied extensively. It is shown that a strong refinement of α-grains (less than 250 nm) in the alloy by ECAP and extrusion leads to high strength but with low values of the uniform elongation and lower impact toughness. It is demonstrated that, in order to increase the impact toughness of UFG Ti alloys, it is possible to use approaches realizing ductility enhancement associated with an increase of the strain hardening capacity. An enhancement in the impact toughness of the UFG alloy through an increase in the uniform tensile elongation of the sample is achieved by the preservation of the ultrafine size of α-grains (about 800 nm) with predominantly high-angle boundaries and a decrease in the dislocation density due to recovery and dynamic recrystallization during warm upsetting.

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Semenova-MSE2017 accepted manuscript - Accepted Manuscript
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Accepted/In Press date: 18 April 2017
e-pub ahead of print date: 19 April 2017
Published date: 1 June 2017
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 407993
URI: http://eprints.soton.ac.uk/id/eprint/407993
ISSN: 0921-5093
PURE UUID: db0acaee-3f5b-4c02-936b-ca118d9cae7c
ORCID for Yi Huang: ORCID iD orcid.org/0000-0001-9259-8123
ORCID for Terence G Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 06 May 2017 01:05
Last modified: 16 Mar 2024 05:16

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Contributors

Author: Irina P Semenova
Author: Alex V Ployakov
Author: Veronika V Polyakova
Author: Yu F Grishina
Author: Yi Huang ORCID iD
Author: Ruslan Z Valiev

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