Thermal stability of ultrafine-grained pure titanium processed by high-pressure torsion
Thermal stability of ultrafine-grained pure titanium processed by high-pressure torsion
High-pressure torsion (HPT) was conducted under 6.0 GPa on commercial purity titanium up to 10 turns. An ultrafine-grained (UFG) pure Ti with an average grain size of ~96 nm was obtained. The thermal properties of these samples were studied by using differential scanning calorimeter (DSC) which allowed the quantitative determination of the evolution of stored energy, the recrystallization temperatures, the activation energy involved in the recrystallization of the material and the evolution of the recrystallized fraction with temperature. The results show that the stored energy increases, beyond which the stored energy seems to level off to a saturated value with increase of HPT up to 5 turns. An average activation energy of about 101 kJ/mol for the recrystallization of 5 turns samples was determined. Also, the thermal stability of the grains of the 5 turns samples with subsequent heat treatments were investigated by microstructural analysis and Vickers microhardness measurements. It is shown that the average grain size remains below 246 nm when the annealing temperature is below 500 ̊C, and the size of the grains increases significantly for samples at the annealing temperature of 600 ̊C.
Differential Scanning Calorimetry, grain growth, high-pressure torsion, recrystallisation, titanium
338-344
Chen, Wanji
42d0d66d-095e-45b3-bf8d-da81a2c6d877
Xu, Jie
ff6d4656-c15b-45a4-bd71-d45937ec38fc
Liu, Detong
72f0ce17-2a76-460a-8d2e-2722c81cab1e
Shan, Debin
fd8652eb-1eeb-4ae2-bcc4-102320f3c2d7
Guo, Bin
4c18c2f2-4b7f-4ac8-8fa1-51b580fab4c8
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
2021
Chen, Wanji
42d0d66d-095e-45b3-bf8d-da81a2c6d877
Xu, Jie
ff6d4656-c15b-45a4-bd71-d45937ec38fc
Liu, Detong
72f0ce17-2a76-460a-8d2e-2722c81cab1e
Shan, Debin
fd8652eb-1eeb-4ae2-bcc4-102320f3c2d7
Guo, Bin
4c18c2f2-4b7f-4ac8-8fa1-51b580fab4c8
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Chen, Wanji, Xu, Jie, Liu, Detong, Shan, Debin, Guo, Bin and Langdon, Terence G.
(2021)
Thermal stability of ultrafine-grained pure titanium processed by high-pressure torsion.
Materials Science Forum, 1016, .
(doi:10.4028/www.scientific.net/MSF.1016.338).
Abstract
High-pressure torsion (HPT) was conducted under 6.0 GPa on commercial purity titanium up to 10 turns. An ultrafine-grained (UFG) pure Ti with an average grain size of ~96 nm was obtained. The thermal properties of these samples were studied by using differential scanning calorimeter (DSC) which allowed the quantitative determination of the evolution of stored energy, the recrystallization temperatures, the activation energy involved in the recrystallization of the material and the evolution of the recrystallized fraction with temperature. The results show that the stored energy increases, beyond which the stored energy seems to level off to a saturated value with increase of HPT up to 5 turns. An average activation energy of about 101 kJ/mol for the recrystallization of 5 turns samples was determined. Also, the thermal stability of the grains of the 5 turns samples with subsequent heat treatments were investigated by microstructural analysis and Vickers microhardness measurements. It is shown that the average grain size remains below 246 nm when the annealing temperature is below 500 ̊C, and the size of the grains increases significantly for samples at the annealing temperature of 600 ̊C.
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JX-WJChen-Thermec
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JX-WJ Chen_Manuscript_thermec_2020-TGL
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More information
Accepted/In Press date: 16 April 2020
e-pub ahead of print date: January 2021
Published date: 2021
Additional Information:
Funding Information:
This work was supported by the National Natural Science Foundation of China under Grant No. 51635005 and No. No. 51475124, and the Fundamental Research Funds for the Central Universities under Grant No. ZDXMPY20180104. The work of one of us was supported by the European Research Council under ERC Grant Agreement No. 267464-SPDMETALS (TGL).
Publisher Copyright:
© 2021 Trans Tech Publications Ltd, Switzerland.
Keywords:
Differential Scanning Calorimetry, grain growth, high-pressure torsion, recrystallisation, titanium
Identifiers
Local EPrints ID: 439628
URI: http://eprints.soton.ac.uk/id/eprint/439628
ISSN: 1662-9752
PURE UUID: 513a4b40-1b19-4f8b-8b62-6619a3ee9a21
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Date deposited: 28 Apr 2020 16:35
Last modified: 17 Mar 2024 02:55
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Contributors
Author:
Wanji Chen
Author:
Jie Xu
Author:
Detong Liu
Author:
Debin Shan
Author:
Bin Guo
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