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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.
fracture, electrically-assisted micro-tension, micro-forming, Nano-Ti, synchrotron X-ray tomography
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 (2022) 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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More information

Accepted/In Press date: 22 August 2022
e-pub ahead of print date: 1 September 2022
Keywords: fracture, electrically-assisted micro-tension, micro-forming, Nano-Ti, synchrotron X-ray tomography

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: 27 Sep 2022 01:38

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Contributors

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

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