Strength and fatigue life at 625 K of the ultrafine-grained Ti-6Al-4V alloy produced by equal-channel angular pressing

Grain reduction in a widely used Ti-6Al-4V alloy increases its endurance limit at room temperature. In this work, the behavior of the ultrafine-grained alloy under cyclic load at the temperature of 625 K is considered. Research was conducted to examine the fatigue life in a low-cycle area of the ultrafine-grained Ti-6Al-4V alloy produced by equal-channel angular pressing. Tensile and fatigue testing of the Ti-6Al-4V samples with coarse-grained (CG) and ultrafine-grained (UFG) structures were carried out at 293 and 625 K. The alloy demonstrated an enhanced strength and fatigue life at both temperatures. The representative features of the microstructural evolution and the fracture features in the UFG and CG alloys after fatigue tests are described in detail. The prospects for the use of the UFG Ti-6Al-4V alloy for engineering applications, such as in the production of critical gas-turbine engine parts, is discussed.

Ti-6Al-4V alloy, durability, elevated temperatures, failure, fatigue, strength, ultrafine-grained structure

10.3390/met12081345

2075-4701

Semenova, Irina P.

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Polyakov, Alexander V.

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Pesin, Mihail V.

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Stotskiy, Andrey G.

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Modina, Yulia M

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Valiev, Ruslan Z.

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Langdon, Terence G.

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August 2022

Semenova, Irina P.

bfc9939a-3694-413a-89dc-08df2714b681

Polyakov, Alexander V.

29569c59-b708-4ad8-abf0-3acffc8fa234

Pesin, Mihail V.

cfa7e012-047f-41f5-bf15-b1adf5b6e022

Stotskiy, Andrey G.

7b0d971d-9050-4cc6-9b19-7cf00854be51

Modina, Yulia M

985fb6d2-5f1e-4f1d-abd8-5d7e544aff6d

Valiev, Ruslan Z.

c7a74063-2158-4e93-a9d2-e5aa00d8d588

Langdon, Terence G.

86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Semenova, Irina P., Polyakov, Alexander V., Pesin, Mihail V., Stotskiy, Andrey G., Modina, Yulia M, Valiev, Ruslan Z. and Langdon, Terence G. (2022) Strength and fatigue life at 625 K of the ultrafine-grained Ti-6Al-4V alloy produced by equal-channel angular pressing. Metals, 12 (8), [1345]. (doi:10.3390/met12081345).

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Accepted/In Press date: 9 August 2022

e-pub ahead of print date: 12 August 2022

Published date: August 2022

Additional Information: Funding Information: This research was performed with the financial support of the Ministry of Science and Higher Education of the Russian Federation in the framework of project No. FSNM-2020-0027. One of the authors was supported by the European Research Council under grant agreement No. 267464-SPDMETALS (TGL). The fatigue study was carried out at the expense of a grant in the field of science from the budget of the Republic of Bashkortostan for state support of young scientists (MYM). Publisher Copyright: © 2022 by the authors.

Keywords: Ti-6Al-4V alloy, durability, elevated temperatures, failure, fatigue, strength, ultrafine-grained structure