Microstructures and mechanical properties of pure tantalum processed by high-pressure torsion
Microstructures and mechanical properties of pure tantalum processed by high-pressure torsion
A body-centred cubic (BCC) structure metal, tantalum, was processed by high- pressure torsion (HPT) at room temperature with different numbers of rotations. The microstructural evolution was studied by electron backscatter diffraction (EBSD). The grain sizes were significantly refined at the disk edge area in the early stages of deformation (N = 0.5) but tended to attain saturation after the numbers of rotations was increased to N = 5. As the deformation continued, some coarse grains appeared in the disk edge areas and it appeared that there was structural recovery at the expense of grain boundary migration in the tantalum during HPT processing. Microhardness measurements showed the hardness gradually evolved towards a more homogenized level across the disk surfaces as the numbers of rotations increased. The hardness level after N = 10 turns was slightly lower than after N = 5 turns, thereby indicating the occurrence of a recovery process after 5 turns
12100
Huang, Yi
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Maury, Nicolas
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Zhang, Nian Xian
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Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
8 August 2014
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Maury, Nicolas
c513ab27-c9b0-4409-a7d1-2638b02ee8ef
Zhang, Nian Xian
1f72e293-27fe-41d4-956c-7e8c8a40b3b0
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Huang, Yi, Maury, Nicolas, Zhang, Nian Xian and Langdon, Terence G.
(2014)
Microstructures and mechanical properties of pure tantalum processed by high-pressure torsion.
IOP Conference Series: Materials Science and Engineering, 63, .
(doi:10.1088/1757-899X/63/1/012100).
Abstract
A body-centred cubic (BCC) structure metal, tantalum, was processed by high- pressure torsion (HPT) at room temperature with different numbers of rotations. The microstructural evolution was studied by electron backscatter diffraction (EBSD). The grain sizes were significantly refined at the disk edge area in the early stages of deformation (N = 0.5) but tended to attain saturation after the numbers of rotations was increased to N = 5. As the deformation continued, some coarse grains appeared in the disk edge areas and it appeared that there was structural recovery at the expense of grain boundary migration in the tantalum during HPT processing. Microhardness measurements showed the hardness gradually evolved towards a more homogenized level across the disk surfaces as the numbers of rotations increased. The hardness level after N = 10 turns was slightly lower than after N = 5 turns, thereby indicating the occurrence of a recovery process after 5 turns
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Published date: 8 August 2014
Organisations:
Engineering Mats & Surface Engineerg Gp
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Local EPrints ID: 366771
URI: http://eprints.soton.ac.uk/id/eprint/366771
ISSN: 1757-899X
PURE UUID: a96bdb54-5212-4ee6-a058-07a3a427cf1b
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Date deposited: 04 Sep 2014 12:42
Last modified: 15 Mar 2024 03:39
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Author:
Yi Huang
Author:
Nicolas Maury
Author:
Nian Xian Zhang
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