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Enhanced creep resistance of an ultrafine‐grained Ti–6Al–4V alloy with modified surface by ion implantation and (Ti + V)N coating

Enhanced creep resistance of an ultrafine‐grained Ti–6Al–4V alloy with modified surface by ion implantation and (Ti + V)N coating
Enhanced creep resistance of an ultrafine‐grained Ti–6Al–4V alloy with modified surface by ion implantation and (Ti + V)N coating

This research examines the creep behavior of an ultrafine-grained (UFG) Ti−6Al−4V alloy processed by equal-channel angular pressing followed by extrusion. It is shown that modifying the surface of the UFG alloy with nitrogen ions and then applying of a coating of (Ti + V)N inhibits the softening of the UFG alloy at temperatures up to 700 K due to a barrier effect in which the coating hinders the release of dislocations onto the surface. The differences in the mechanisms of crack initiation and failure of UFG samples are also examined both with and without a coating. The prospects of the proposed approach to the improving of titanium alloys are discussed, including the formation of an UFG structure in the bulk of the material and subsequent modification by ion-plasma methods for the manufacture of highly loaded parts operating at elevated operating temperatures.

(Ti + V)N coating, Ti–6Al–4V alloy, creep behavior, ion implantation, ultrafine-grained structure
1438-1656
Semenova, Irina P.
bfc9939a-3694-413a-89dc-08df2714b681
Selivanov, Konstantin S.
0bd7247c-ee15-4846-a24a-c539dc57339a
Valiev, Roman R.
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Modina, Iulia M.
f809ea65-c1f4-4d3c-80dd-fd4786fb81d5
Smyslova, Marina K.
1e34628b-7951-4915-8398-5d13da4b78c0
Polyakov, Alexander V.
b383fb2b-3443-4014-80a8-1f22a4d160c4
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Semenova, Irina P.
bfc9939a-3694-413a-89dc-08df2714b681
Selivanov, Konstantin S.
0bd7247c-ee15-4846-a24a-c539dc57339a
Valiev, Roman R.
78f2418b-b87b-4929-8c9f-cb2eaf6384cb
Modina, Iulia M.
f809ea65-c1f4-4d3c-80dd-fd4786fb81d5
Smyslova, Marina K.
1e34628b-7951-4915-8398-5d13da4b78c0
Polyakov, Alexander V.
b383fb2b-3443-4014-80a8-1f22a4d160c4
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Semenova, Irina P., Selivanov, Konstantin S., Valiev, Roman R., Modina, Iulia M., Smyslova, Marina K., Polyakov, Alexander V. and Langdon, Terence G. (2020) Enhanced creep resistance of an ultrafine‐grained Ti–6Al–4V alloy with modified surface by ion implantation and (Ti + V)N coating. Advanced Engineering Materials, 22 (10), [1901219]. (doi:10.1002/adem.201901219).

Record type: Article

Abstract

This research examines the creep behavior of an ultrafine-grained (UFG) Ti−6Al−4V alloy processed by equal-channel angular pressing followed by extrusion. It is shown that modifying the surface of the UFG alloy with nitrogen ions and then applying of a coating of (Ti + V)N inhibits the softening of the UFG alloy at temperatures up to 700 K due to a barrier effect in which the coating hinders the release of dislocations onto the surface. The differences in the mechanisms of crack initiation and failure of UFG samples are also examined both with and without a coating. The prospects of the proposed approach to the improving of titanium alloys are discussed, including the formation of an UFG structure in the bulk of the material and subsequent modification by ion-plasma methods for the manufacture of highly loaded parts operating at elevated operating temperatures.

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Accepted/In Press date: 21 January 2020
e-pub ahead of print date: 21 January 2020
Published date: 1 October 2020
Keywords: (Ti + V)N coating, Ti–6Al–4V alloy, creep behavior, ion implantation, ultrafine-grained structure

Identifiers

Local EPrints ID: 437822
URI: http://eprints.soton.ac.uk/id/eprint/437822
ISSN: 1438-1656
PURE UUID: 12efa3c8-0995-4794-8ed8-9773be4d1243
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 19 Feb 2020 17:32
Last modified: 26 Nov 2021 06:54

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Contributors

Author: Irina P. Semenova
Author: Konstantin S. Selivanov
Author: Roman R. Valiev
Author: Iulia M. Modina
Author: Marina K. Smyslova
Author: Alexander V. Polyakov

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