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Mechanical behavior
and constitutive models of nanocrystalline nickel foils under
conditions of different pulse currents and their applied
directions
Miao Yu, Chao Li, Zishuai Chen and Jinyang Du |
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Vol. 20 (2025), No. 4, 395–413
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Abstract |
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To investigate the effects of pulsed current on the mechanical behavior of nanocrystalline foil materials, nanocrystalline nickel foils with different characteristic dimensions (thickness/grain size) were prepared and subjected to current-assisted tensile experiments. The experimental results indicate that without the application of current, the Ni foil exhibits a significant size effect. After applying pulsed current, in addition to a decrease in tensile strength and an increase in elongation, the size effect is also weakened. Furthermore, it was also found that the tensile strength, elongation, and size effect of the foil materials are not only related to the current density but are also closely associated with the direction of current application. When the direction of the current is aligned with the deformation direction, the reduction in the size effect of the foil materials is most pronounced, and the electroplastic effect is most significant. Finally, a parameter describing the pulsed current was introduced into the Johnson–Cook constitutive model, and a phenomenological constitutive model capable of describing the size effect of nanocrystalline Ni foils was established. |
Keywords
nanocrystalline nickel, size effect, electroplasticity
effect, current direction, constitutive models
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Milestones
Received: 3 April 2025
Revised: 21 June 2025
Accepted: 2 July 2025
Published: 12 October 2025
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Authors |
| Miao Yu | |
| School of Materials Science and
Engineering Harbin University of Science And Technology Harbin, 150040 China |
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| Chao Li | |
| School of Materials Science and
Engineering Harbin University of Science And Technology Harbin, 150040 China |
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| Zishuai Chen | |
| School of Materials Science and
Engineering Harbin University of Science And Technology Harbin, 150040 China |
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| Jinyang Du | |
| School of Materials Science and
Engineering Harbin University of Science And Technology Harbin, 150040 China |
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| © 2025 MSP (Mathematical Sciences Publishers). |
