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

Wanji Chen; Jie Xu; Chaogang Ding; Debin Shan; Bin Guo; Terence G. Langdon

doi:10.1016/j.scriptamat.2022.114997

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

Wanji Chen
, Jie Xu^*
, Chaogang Ding
, Debin Shan
, Bin Guo
, Terence G. Langdon

^*Corresponding author for this work

School of Materials Science and Engineering

Harbin Institute of Technology
Harbin Institute of Technology
University of Southampton

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

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 750 A/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.

Original language	English
Article number	114997
Journal	Scripta Materialia
Volume	222
DOIs	https://doi.org/10.1016/j.scriptamat.2022.114997
State	Published - 1 Jan 2023

Keywords

Electrically-assisted micro-tension
Fracture
Micro-forming
Nano-Ti
Synchrotron X-ray tomography

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10.1016/j.scriptamat.2022.114997

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@article{919d16431583488aaa70a0679d4e9742,

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

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 750 A/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.",

keywords = "Electrically-assisted micro-tension, Fracture, Micro-forming, Nano-Ti, Synchrotron X-ray tomography",

author = "Wanji Chen and Jie Xu and Chaogang Ding and Debin Shan and Bin Guo and Langdon, \{Terence G.\}",

note = "Publisher Copyright: {\textcopyright} 2022",

year = "2023",

month = jan,

day = "1",

doi = "10.1016/j.scriptamat.2022.114997",

language = "英语",

volume = "222",

journal = "Scripta Materialia",

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TY - JOUR

T1 - Fracture mechanism of electrically-assisted micro-tension in nanostructured titanium using synchrotron radiation X-ray tomography

AU - Chen, Wanji

AU - Xu, Jie

AU - Ding, Chaogang

AU - Shan, Debin

AU - Guo, Bin

AU - Langdon, Terence G.

PY - 2023/1/1

Y1 - 2023/1/1

N2 - 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 750 A/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.

AB - 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 750 A/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.

KW - Electrically-assisted micro-tension

KW - Fracture

KW - Micro-forming

KW - Nano-Ti

KW - Synchrotron X-ray tomography

UR - https://www.scopus.com/pages/publications/85137067575

U2 - 10.1016/j.scriptamat.2022.114997

DO - 10.1016/j.scriptamat.2022.114997

M3 - 文章

AN - SCOPUS:85137067575

SN - 1359-6462

VL - 222

JO - Scripta Materialia

JF - Scripta Materialia

M1 - 114997

ER -

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

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Keywords

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