Molecular dynamics simulations of cold welding of nanoporous amorphous alloys: effects of welding conditions and microstructures

Zhang, Yuhang; Su, Lei; Xu, Jianfei; Hu, Yiqun; Liu, Xiuming; Ding, Suhang; Li, Jiejie; Xia, Re

doi:10.1039/d2cp03624j

Cited by 6 publications

(9 citation statements)

References 89 publications

(146 reference statements)

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“…It is observed that the tensile and compressive responses are asymmetric, which is attributed to the surface effects of nanoporous metals. 28,29,[34][35][36][37] At the same absolute strain, the tensile stress is larger than the compressive stress. The stress amplitude gradually increases with increasing the cycle number.…”

Section: Fundamental Fatigue Responsesmentioning

confidence: 99%

“…Because the orientations of ligaments are random, the rotation of ligaments and plastic hinge formation are the major deformation modes of the NPMG upon axial loading. 28,29,50,51 This rotation of ligaments during tensile loading makes them tend to align with the tensile direction. After monotonic tensile loading, the macroscopic lateral dimensions of the structure reduce significantly.…”

Section: Underlying Physical Mechanismsmentioning

confidence: 99%

“…The high initial surface tensile stress is conducive to tensile strength but weakens compressive strength. 28,29,[34][35][36][37] Thus, the effects of structural densification and initial surface stress suppress the materials softening, improving the peak tensile stress for ε 0 = 0.01 and 0.02. Moreover, with the increase in cycle number, the degree of tension-compression asymmetry decreases.…”

Section: Underlying Physical Mechanismsmentioning

confidence: 99%

“…[23][24][25] Our recent work revealed the mechanical behaviors of NPMGs under complex loads. [26][27][28][29] The significant reduction in mass density might extremely weaken their fatigue performance. A deep understanding of the mechanical behaviors and inherent physical mechanisms of NPMGs under cyclic loading is imperative and helpful for their functional applications.…”

Section: Introductionmentioning

confidence: 99%

“…The fundamental mechanical properties of NPMGs have been investigated, and the relations between structural topological features and mechanical properties have been explored 23–25 . Our recent work revealed the mechanical behaviors of NPMGs under complex loads 26–29 . The significant reduction in mass density might extremely weaken their fatigue performance.…”

Section: Introductionmentioning

confidence: 99%

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Fatigue responses of metallic glass‐based stochastic network nanomaterial: Superior strain‐hardening ability

Zhang,

Li,

et al. 2024

Fatigue Fract Eng Mat Struct

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Engineering materials commonly suffer from cumulative and irreversible damage during cyclic deformation, leading to fatigue failure. Developing materials with better fatigue resistance is imperative. This work reports a metallic glass network nanomaterial that possesses superior strain‐hardening ability. After a certain number of fatigue tests, the peak stress of the nanomaterial can even be up to four times its original value. This superior strain‐hardening ability originates from the unique plastic mechanism. During cyclic deformation, localized shear transformation zones form and develop, especially in the stress concentration regions. Ligaments crosslinked to these regions cannot sustain their original configurations and contract toward these plastic hinges, resulting in the collapse and coalescence of voids. This densification enhances the engineering stress during each cycle. The fatigue features can be altered by adjusting the cyclic frequency. Stronger strain‐hardening ability can be achieved at lower cyclic frequencies.

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Section: Fundamental Fatigue Responsesmentioning

confidence: 99%

Section: Underlying Physical Mechanismsmentioning

confidence: 99%

Section: Underlying Physical Mechanismsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fatigue responses of metallic glass‐based stochastic network nanomaterial: Superior strain‐hardening ability

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et al. 2024

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Mechanical Properties of Cold‐Welded CoCrFeCuNi Nanowires with Side‐by‐Side Contact: A Molecular Dynamics Study

Liu

Zhang

et al. 2023

Physica Status Solidi (a)

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Cold welding at the nanoscale is a promising technique for bottom‐up fabrication and assembly of nanostructured materials. In this paper, we investigate the cold welding process of the CoCrFeCuNi high‐entropy alloy (HEA) nanowires in the form of side‐by‐side contact using molecular dynamics simulation. The effects of overlap length, crystal orientation, and temperature are taken into consideration. Our results demonstrate that strength is positively correlated with the overlap length. Fracture strain first increases up to a maximum and then decreases with the increase in overlap length. When the temperature increases from 300 K to 900 K, the ultimate stress of the welded nanowires decreases from 1.18 GPa to 0.87 GPa, and the welding stress decreases from ‐0.54 GPa to ‐0.26 GPa. The crystal orientation significantly influences the deformation mechanism. For samples welded by nanowires with the same crystal orientation, the primary deformation mechanisms are twinning and dislocation slip. However, for samples welded by nanowires with different crystal orientations, the deformation is primarily mediated by the grain boundary slip. Our research can enhance the understanding of the cold welding behavior for low‐dimensional materials and is hopeful to provide some valuable guidance for the bottom‐up fabrication and assembly of HEAs nanocomponents.This article is protected by copyright. All rights reserved.

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Nanoindentation and nanotribology behaviors of open-cell metallic glass nanofoams

Zhang

et al. 2023

International Journal of Mechanical Sciences

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Molecular dynamics simulations of cold welding of nanoporous amorphous alloys: effects of welding conditions and microstructures

Abstract: Cold welding behaviors of nanoporous amorphous alloys investigated by molecular dynamics.

Cited by 6 publications

References 89 publications

Fatigue responses of metallic glass‐based stochastic network nanomaterial: Superior strain‐hardening ability

Fatigue responses of metallic glass‐based stochastic network nanomaterial: Superior strain‐hardening ability

Mechanical Properties of Cold‐Welded CoCrFeCuNi Nanowires with Side‐by‐Side Contact: A Molecular Dynamics Study

Nanoindentation and nanotribology behaviors of open-cell metallic glass nanofoams

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