Effect of twin boundaries on the strength of body-centered cubic tungsten nanowires

Cui, Junfeng; Ma, Liang; Chen, Guoxin; Jiang, Nan; Ke, Peiling; Yang, Yingying; Wang, Shiliang; Nishimura, Kazuhito; Llorca, Javier

doi:10.1016/j.msea.2022.143826

Cited by 5 publications

(1 citation statement)

References 48 publications

(121 reference statements)

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“…The stress required by this deformation mechanism is much less than that required for shear band formation, resulting in the smaller Young's modulus and UTS of core-shell NWs compared with those of single crystal Ti NW (figures 3(a) and (b)). Additionally, the Al shell thickness of the core-shell NWs affects the nucleation number of the twin TB expansion is considered as a potential deformation mechanism leading to super plasticity [37,38]. The microstructure evolution mechanism of the twin variant nucleation, TBs propagation and slip of the (0001) surface gives the NWs better plastic properties than the deformation modes of shear band formation and expansion.…”

Section: Effect Of Al Shell Thickness On Tensile Properties Of Nwsmentioning

confidence: 99%

Improvement of plastic property of Ti/Al nanowires by designing the core–shell structures

Gao,

Ding,

Liu

et al. 2023

Phys. Scr.

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Ti alloy has the disadvantages of low elastic modulus, high yield ratio, and low plasticity, therefore, improving its plasticity is very important to promote their use. In this study, the tensile behavior of Ti/Al core–shell nanowires (NWs) in the z-axis direction of single-crystal Ti with [0001] grain-oriented HCP structure and single-crystal Al with [001] grain-oriented FCC structure was investigated using molecular dynamic (MD) simulations to explore the mechanism of enhanced ductility in Ti alloy. The results indicate that the shell thickness may significantly affect the mechanical behaviors of the NWs. For the mechanical properties of core–shell NWs, Young’s modulus, ultimate tensile strength (UTS), Specific modulus, Specific strength, flow stress, and fracture strain showed sensitivity to shell thickness. Compared with core–shell NWs, single crystal Ti NW has greater strength and higher Young’s modulus, Specific strength and UTS. By contrast, core–shell NWs have better Specific modulus and plastic properties, their flow stress and fracture strain are higher than those of single crystal Ti NW. For the single crystal Ti NW, the main plastic deformation mechanisms are shear band nucleation and recrystallization. For Ti/Al core–shell NWs with shell thicknesses of 1and 2 nm, the nucleation of the twin variants replaces the dominant position of the shear bands. As the twin boundaries (TBs) expand, the dislocation slip is activated, and grain reorientation occurs, inducing the superior plastic properties of NWs. As the shell thickness increases to 3–5 nm, the interaction between the twin variants and shear bands reduces the expansion rate of the TBs, resulting in increased flow stress and fracture strain of the NWs. This study can provide theoretical guidance for the experimental study and preparation of core–shell NWs.

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Section: Effect Of Al Shell Thickness On Tensile Properties Of Nwsmentioning

confidence: 99%

Improvement of plastic property of Ti/Al nanowires by designing the core–shell structures

Gao,

Ding,

Liu

et al. 2023

Phys. Scr.

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Ultra‐Large Compressive Plasticity of E‐Ga₂O₃ Thin Films at the Submicron Scale

Cui,

Yuan,

Wang

et al. 2023

Small Methods

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Gallium oxide (Ga2O3) usually fractures in the brittle form, and achieving large plastic deformability to avoid catastrophic failure is in high demand. Here, ε‐Ga2O3 thin films with columnar crystals and partial unoccupied Ga sites are synthesized, and it is demonstrated that the ε‐Ga2O3 at the submicron scale can be compressed to an ultra‐large plastic strain of 48.5% without cracking. The compressive behavior and related mechanisms are investigated by in situ transmission electron microscope nanomechanical testing combined with atomic‐resolution characterizations. The serrated plastic flow and large strain burst are two major deformation forms of ε‐Ga2O3 during compression, which are attributed to the dislocation nucleation and avalanches, formation of new grains, and amorphization. The ultra‐large compressive plasticity of ε‐Ga2O3 thin films at the submicron scale can inspire new applications of Ga2O3 in micro‐ or nano‐ electronic and optoelectronic devices, especially those that require impact resistance during processing or service.

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Twinning dominated microstructural evolution in tungsten under impact loading

Li,

Chen,

Xiao

et al. 2024

J Mater Sci

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Effect of twin boundaries on the strength of body-centered cubic tungsten nanowires

Cited by 5 publications

References 48 publications

Improvement of plastic property of Ti/Al nanowires by designing the core–shell structures

Improvement of plastic property of Ti/Al nanowires by designing the core–shell structures

Ultra‐Large Compressive Plasticity of E‐Ga₂O₃ Thin Films at the Submicron Scale

Twinning dominated microstructural evolution in tungsten under impact loading

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Effect of twin boundaries on the strength of body-centered cubic tungsten nanowires

Cited by 5 publications

References 48 publications

Improvement of plastic property of Ti/Al nanowires by designing the core–shell structures

Improvement of plastic property of Ti/Al nanowires by designing the core–shell structures

Ultra‐Large Compressive Plasticity of E‐Ga2O3 Thin Films at the Submicron Scale

Twinning dominated microstructural evolution in tungsten under impact loading

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Product

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Ultra‐Large Compressive Plasticity of E‐Ga₂O₃ Thin Films at the Submicron Scale