A critical examination of pure tantalum processed by high-pressure torsion
A critical examination of pure tantalum processed by high-pressure torsion
Tantalum, a common refractory metal with body-centred cubic (BCC) crystalline structure, was processed by high-pressure torsion (HPT) at room temperature through different numbers of rotations. Significant grain refinement and high strength were achieved with a reduction in grain size from ?60 ?m to ?160 nm and an increase in strength from ?200 to >1300 MPa. Hardness measurements revealed a high level of homogeneity after 10 turns of HPT but the hardness after 10 turns was slightly lower than after 5 turns indicating the occurrence of some recovery. Tensile testing at a strain rate of 1.0×10?3 s?1 gave high strengths of ?1200 MPa but little or no ductility after processing through 1, 5 and 10 turns. The introduction of a short-term (15 min) anneal immediately after HPT processing led to significant ductility in all samples and a reasonable level of strength at ?800 MPa.
electron backscatter diffraction, hardness, high-pressure torsion, tantalum, ultrafine grains
174-182
Maury, Nicolas
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Zhang, Nian Xian
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Huang, Yi
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Zhilyaev, Alexander P.
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Langdon, Terence G.
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27 April 2015
Maury, Nicolas
c513ab27-c9b0-4409-a7d1-2638b02ee8ef
Zhang, Nian Xian
1f72e293-27fe-41d4-956c-7e8c8a40b3b0
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Zhilyaev, Alexander P.
d053e518-1976-4633-8953-e8f34b9b7c44
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Maury, Nicolas, Zhang, Nian Xian, Huang, Yi, Zhilyaev, Alexander P. and Langdon, Terence G.
(2015)
A critical examination of pure tantalum processed by high-pressure torsion.
Materials Science and Engineering: A, 638, .
(doi:10.1016/j.msea.2015.04.053).
Abstract
Tantalum, a common refractory metal with body-centred cubic (BCC) crystalline structure, was processed by high-pressure torsion (HPT) at room temperature through different numbers of rotations. Significant grain refinement and high strength were achieved with a reduction in grain size from ?60 ?m to ?160 nm and an increase in strength from ?200 to >1300 MPa. Hardness measurements revealed a high level of homogeneity after 10 turns of HPT but the hardness after 10 turns was slightly lower than after 5 turns indicating the occurrence of some recovery. Tensile testing at a strain rate of 1.0×10?3 s?1 gave high strengths of ?1200 MPa but little or no ductility after processing through 1, 5 and 10 turns. The introduction of a short-term (15 min) anneal immediately after HPT processing led to significant ductility in all samples and a reasonable level of strength at ?800 MPa.
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YH-Ta -MSE manuscript.pdf
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More information
Accepted/In Press date: 16 April 2015
Published date: 27 April 2015
Keywords:
electron backscatter diffraction, hardness, high-pressure torsion, tantalum, ultrafine grains
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 376332
URI: http://eprints.soton.ac.uk/id/eprint/376332
ISSN: 0921-5093
PURE UUID: 5f9d61f2-c6f8-4ceb-8e24-93d8a4ccbf5c
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Date deposited: 28 Apr 2015 10:31
Last modified: 15 Mar 2024 03:39
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Contributors
Author:
Nicolas Maury
Author:
Nian Xian Zhang
Author:
Yi Huang
Author:
Alexander P. Zhilyaev
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