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

10.1016/j.scriptamat.2022.114997

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

1 January 2023

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).

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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