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Fracture mechanism of electrically-assisted micro-tension in nanostructured titanium using synchrotron radiation X-ray tomography

Fracture mechanism of electrically-assisted micro-tension in nanostructured titanium using synchrotron radiation X-ray tomography
Fracture mechanism of electrically-assisted micro-tension in nanostructured titanium using synchrotron radiation X-ray tomography
A coarse-grained (CG) Ti with an average grain size of ~50 μm was processed by high-pressure torsion (HPT) under a pressure of 6.0 GPa through 10 turns at room temperature (RT) to produce nanostructured titanium (Nano-Ti) with an average grain size of ~95 nm. Electrically-assisted (EA) micro-tensions of CG-Ti and Nano-Ti were performed using pulsed unidirectional current with a current density of 750A/mm2, pulse width of 10-4 s. The stress drop is higher for Nano-Ti compared with CG-Ti. The results of fractograph observations show many cleavage steps in Nano-Ti while the CG-Ti is dominated by dimples. The spatial distribution of voids in tensile specimens was revealed after testing using synchrotron radiation X-ray tomography. The results demonstrate that applying a pulse current can effectively reduce the number and volume of voids before fracture. A model is presented describing the fracture mechanism of CG-Ti and Nano-Ti during EA micro-tension.
Nano-Ti, electrically-assisted micro-tension, fracture, micro-forming, synchrotron X-ray tomography, Electrically-assisted micro-tension, Fracture, Synchrotron X-ray tomography, Micro-forming
1359-6462
Chen, Wanji
42d0d66d-095e-45b3-bf8d-da81a2c6d877
Xu, Jie
ff6d4656-c15b-45a4-bd71-d45937ec38fc
Ding, Chaogang
2edf8082-909e-4bec-a2b3-3b34943f5803
Shan, Debin
fd8652eb-1eeb-4ae2-bcc4-102320f3c2d7
Guo, Bin
33ebaf1c-4e46-4aae-b603-5db60132ae70
Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Chen, Wanji
42d0d66d-095e-45b3-bf8d-da81a2c6d877
Xu, Jie
ff6d4656-c15b-45a4-bd71-d45937ec38fc
Ding, Chaogang
2edf8082-909e-4bec-a2b3-3b34943f5803
Shan, Debin
fd8652eb-1eeb-4ae2-bcc4-102320f3c2d7
Guo, Bin
33ebaf1c-4e46-4aae-b603-5db60132ae70
Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Chen, Wanji, Xu, Jie, Ding, Chaogang, Shan, Debin, Guo, Bin and Langdon, Terence G (2023) Fracture mechanism of electrically-assisted micro-tension in nanostructured titanium using synchrotron radiation X-ray tomography. Scripta Materialia, 222, [114997]. (doi:10.1016/j.scriptamat.2022.114997).

Record type: Article

Abstract

A coarse-grained (CG) Ti with an average grain size of ~50 μm was processed by high-pressure torsion (HPT) under a pressure of 6.0 GPa through 10 turns at room temperature (RT) to produce nanostructured titanium (Nano-Ti) with an average grain size of ~95 nm. Electrically-assisted (EA) micro-tensions of CG-Ti and Nano-Ti were performed using pulsed unidirectional current with a current density of 750A/mm2, pulse width of 10-4 s. The stress drop is higher for Nano-Ti compared with CG-Ti. The results of fractograph observations show many cleavage steps in Nano-Ti while the CG-Ti is dominated by dimples. The spatial distribution of voids in tensile specimens was revealed after testing using synchrotron radiation X-ray tomography. The results demonstrate that applying a pulse current can effectively reduce the number and volume of voids before fracture. A model is presented describing the fracture mechanism of CG-Ti and Nano-Ti during EA micro-tension.

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Accepted/In Press date: 22 August 2022
e-pub ahead of print date: 1 September 2022
Published date: 1 January 2023
Additional Information: Funding Information: This work was supported by the National Natural Science Foundation of China under Grant No.51635005 and No. 51475124. Partial support was provided by the European Research Council under ERC Grant Agreement No. 267464-SPDMETALS. The authors thank the Shanghai Synchrotron Radiation Facility (SSRF) for provision of synchrotron radiation facilities. Funding Information: This work was supported by the National Natural Science Foundation of China under Grant No. 51635005 and No. 51475124 . Partial support was provided by the European Research Council under ERC Grant Agreement No. 267464-SPDMETALS . The authors thank the Shanghai Synchrotron Radiation Facility (SSRF) for provision of synchrotron radiation facilities. Publisher Copyright: © 2022
Keywords: Nano-Ti, electrically-assisted micro-tension, fracture, micro-forming, synchrotron X-ray tomography, Electrically-assisted micro-tension, Fracture, Synchrotron X-ray tomography, Micro-forming

Identifiers

Local EPrints ID: 469820
URI: http://eprints.soton.ac.uk/id/eprint/469820
ISSN: 1359-6462
PURE UUID: 741512c9-f5e9-4a55-827f-ed9247efb353
ORCID for Terence G Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 26 Sep 2022 16:56
Last modified: 06 Jun 2024 01:40

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Contributors

Author: Wanji Chen
Author: Jie Xu
Author: Chaogang Ding
Author: Debin Shan
Author: Bin Guo

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