Achieving superior grain refinement and mechanical properties in vanadium through high-pressure torsion and subsequent short-term annealing
Achieving superior grain refinement and mechanical properties in vanadium through high-pressure torsion and subsequent short-term annealing
Commercial purity vanadium with an initial grain size of ~27 ?m and a Vickers microhardness of Hv?85 was processed by high-pressure torsion (HPT) under a pressure of 6.0 GPa at room temperature through 1/2 to 10 turns. After processing through 10 turns, some samples were immediately subjected to a short-term annealing (15 min) at different temperatures from 773 to 1173 K. The microstructures developed in HPT and in HPT plus post-HPT annealing were characterized by electron backscatter diffraction (EBSD). Processing by HPT for 10 turns gave a refined grain size of ~410 nm and an increased hardness of Hv?240. Post-HPT annealing demonstrated that the ultrafine grained vanadium has good thermal stability up to at least 873 K. Tensile testing at room temperature gave an ultimate tensile strength of ~920 MPa after 10 turns of HPT with an elongation of ~29%. These results show HPT processing produces superior mechanical properties in vanadium by comparison with processing by ECAP or ECAP plus cryorolling.
hardness, high-pressure torsion, short-term annealing, ultrafine-grained materials, vanadium
60-69
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Lemang, Mathilde
54442037-a837-44e9-9e1d-48edd747b3af
Zhang, Nian X.
1f72e293-27fe-41d4-956c-7e8c8a40b3b0
Pereira, Pedro H.R.
9ee129fd-0e06-482d-990c-971aaf83b1d0
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
8 February 2016
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Lemang, Mathilde
54442037-a837-44e9-9e1d-48edd747b3af
Zhang, Nian X.
1f72e293-27fe-41d4-956c-7e8c8a40b3b0
Pereira, Pedro H.R.
9ee129fd-0e06-482d-990c-971aaf83b1d0
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Huang, Yi, Lemang, Mathilde, Zhang, Nian X., Pereira, Pedro H.R. and Langdon, Terence G.
(2016)
Achieving superior grain refinement and mechanical properties in vanadium through high-pressure torsion and subsequent short-term annealing.
Materials Science and Engineering: A, 655, .
(doi:10.1016/j.msea.2015.12.086).
Abstract
Commercial purity vanadium with an initial grain size of ~27 ?m and a Vickers microhardness of Hv?85 was processed by high-pressure torsion (HPT) under a pressure of 6.0 GPa at room temperature through 1/2 to 10 turns. After processing through 10 turns, some samples were immediately subjected to a short-term annealing (15 min) at different temperatures from 773 to 1173 K. The microstructures developed in HPT and in HPT plus post-HPT annealing were characterized by electron backscatter diffraction (EBSD). Processing by HPT for 10 turns gave a refined grain size of ~410 nm and an increased hardness of Hv?240. Post-HPT annealing demonstrated that the ultrafine grained vanadium has good thermal stability up to at least 873 K. Tensile testing at room temperature gave an ultimate tensile strength of ~920 MPa after 10 turns of HPT with an elongation of ~29%. These results show HPT processing produces superior mechanical properties in vanadium by comparison with processing by ECAP or ECAP plus cryorolling.
Text
YH_V MSE accepted manuscript.pdf
- Accepted Manuscript
More information
Accepted/In Press date: 25 December 2015
e-pub ahead of print date: 28 December 2015
Published date: 8 February 2016
Keywords:
hardness, high-pressure torsion, short-term annealing, ultrafine-grained materials, vanadium
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 385376
URI: http://eprints.soton.ac.uk/id/eprint/385376
ISSN: 0921-5093
PURE UUID: d118da71-ba19-4958-8177-2d5334880d25
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Date deposited: 19 Jan 2016 12:24
Last modified: 15 Mar 2024 03:39
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Contributors
Author:
Yi Huang
Author:
Mathilde Lemang
Author:
Nian X. Zhang
Author:
Pedro H.R. Pereira
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