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Rebuilding the Strain Hardening at a Large Strain in Twinned Au Nanowires

1
College of Mechanics and Materials, Hohai University, Nanjing 210098, China
2
School of Mechanical and Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, China
3
State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China
*
Author to whom correspondence should be addressed.
Nanomaterials 2018, 8(10), 848; https://doi.org/10.3390/nano8100848
Received: 26 September 2018 / Revised: 14 October 2018 / Accepted: 17 October 2018 / Published: 18 October 2018
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Abstract

Metallic nanowires usually exhibit ultrahigh strength but low tensile ductility, owing to their limited strain hardening capability. Here, our larger scale molecular dynamics simulations demonstrated that we could rebuild the highly desirable strain hardening behavior at a large strain (0.21 to 0.31) in twinned Au nanowires by changing twin orientation, which strongly contrasts with the strain hardening at the incipient plastic deformation in low stacking-fault energy metals nanowires. Because of this strain hardening, an improved ductility is achieved. With the change of twin orientation, a competing effect between partial dislocation propagation and twin migration is observed in nanowires with slant twin boundaries. When twin migration gains the upper hand, the strain hardening occurs. Otherwise, the strain softening occurs. As the twin orientation increases from 0° to 90°, the dominating deformation mechanism shifts from slip-twin boundary interaction to dislocation slip, twin migration, and slip transmission in sequence. Our work could not only deepen our understanding of the mechanical behavior and deformation mechanism of twinned Au nanowires, but also provide new insights into enhancing the strength and ductility of nanowires by engineering the nanoscale twins. View Full-Text
Keywords: twinned; nanowires; strain hardening twinned; nanowires; strain hardening
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Sun, J.; Han, J.; Yang, Z.; Liu, H.; Song, D.; Ma, A.; Fang, L. Rebuilding the Strain Hardening at a Large Strain in Twinned Au Nanowires. Nanomaterials 2018, 8, 848.

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