Fracture toughness at cryogenic temperatures of ultrafine-grained Ti-6Al-4V alloy processed by ECAP
Fracture toughness at cryogenic temperatures of ultrafine-grained Ti-6Al-4V alloy processed by ECAP
This research is focused on a study of the relationship between mechanical behavior, microstructure and fracture toughness of a Ti-6Al-4V alloy in both coarse-grained (CG) and ultrafine-grained (UFG) conditions. The UFG state with a primary alpha-phase grain size, but with different orientations with respect to the testing direction, was produced by equal-channel angular pressing (ECAP) after thermo-mechanical treatment. Fracture toughness and mechanical
testing were conducted at a temperature of 196 °C. A duplex UFG structure formation in the Ti-6Al-4V alloy led to an enhancement of yield stress and a decrease in the fracture toughness at -196 °C by comparison with the CG alloy. The lowest values of fracture toughness were observed in a sample in which there were elongated grains lying parallel to the loading direction during testing compared to the situation where the grains were perpendicular to this direction.
The reasons for the reduction in fracture toughness in the UFG Ti alloy are discussed.
260-267
Semenova, Irina P.
1657aa64-fd27-41ad-8f11-de392bbf3eaf
Modina, Julia M.
b593fdd9-62e0-47b7-88e6-196d470dc113
Polyakov, Alexander V.
29569c59-b708-4ad8-abf0-3acffc8fa234
Klevtsov, Gennady V.
c9d00ab8-a3ca-400d-97e1-a747f78bb118
Klevtsova, Nataly A.
219734ab-030e-40ed-b755-34786ed89ed5
Pigaleva, Irina N.
f88d043b-a2d3-485c-ada4-b104b6979416
Valiev, Ruslan Z.
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Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
14 February 2018
Semenova, Irina P.
1657aa64-fd27-41ad-8f11-de392bbf3eaf
Modina, Julia M.
b593fdd9-62e0-47b7-88e6-196d470dc113
Polyakov, Alexander V.
29569c59-b708-4ad8-abf0-3acffc8fa234
Klevtsov, Gennady V.
c9d00ab8-a3ca-400d-97e1-a747f78bb118
Klevtsova, Nataly A.
219734ab-030e-40ed-b755-34786ed89ed5
Pigaleva, Irina N.
f88d043b-a2d3-485c-ada4-b104b6979416
Valiev, Ruslan Z.
c7a74063-2158-4e93-a9d2-e5aa00d8d588
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Semenova, Irina P., Modina, Julia M., Polyakov, Alexander V., Klevtsov, Gennady V., Klevtsova, Nataly A., Pigaleva, Irina N., Valiev, Ruslan Z. and Langdon, Terence G.
(2018)
Fracture toughness at cryogenic temperatures of ultrafine-grained Ti-6Al-4V alloy processed by ECAP.
Materials Science and Engineering: A, 716, .
(doi:10.1016/j.msea.2017.12.106).
Abstract
This research is focused on a study of the relationship between mechanical behavior, microstructure and fracture toughness of a Ti-6Al-4V alloy in both coarse-grained (CG) and ultrafine-grained (UFG) conditions. The UFG state with a primary alpha-phase grain size, but with different orientations with respect to the testing direction, was produced by equal-channel angular pressing (ECAP) after thermo-mechanical treatment. Fracture toughness and mechanical
testing were conducted at a temperature of 196 °C. A duplex UFG structure formation in the Ti-6Al-4V alloy led to an enhancement of yield stress and a decrease in the fracture toughness at -196 °C by comparison with the CG alloy. The lowest values of fracture toughness were observed in a sample in which there were elongated grains lying parallel to the loading direction during testing compared to the situation where the grains were perpendicular to this direction.
The reasons for the reduction in fracture toughness in the UFG Ti alloy are discussed.
Text
Polyakov-MSEA-December2017
- Accepted Manuscript
More information
Accepted/In Press date: 29 December 2017
e-pub ahead of print date: 30 December 2017
Published date: 14 February 2018
Identifiers
Local EPrints ID: 416803
URI: http://eprints.soton.ac.uk/id/eprint/416803
ISSN: 0921-5093
PURE UUID: cde04d8a-7c60-43d6-8289-410fce359ee6
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Date deposited: 10 Jan 2018 17:30
Last modified: 16 Mar 2024 06:04
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Contributors
Author:
Irina P. Semenova
Author:
Julia M. Modina
Author:
Alexander V. Polyakov
Author:
Gennady V. Klevtsov
Author:
Nataly A. Klevtsova
Author:
Irina N. Pigaleva
Author:
Ruslan Z. Valiev
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