Works (22)

Updated: July 26th, 2023 21:15

2023 journal article

Surface Adatom Diffusion-Assisted Dislocation Nucleation in Metal Nanowires

NANO LETTERS, 23(12), 5779–5784.

By: L. He*, G. Cheng n, Y. Zhu n & H. Park*

author keywords: mechanical deformation; plasticity; surfacediffusion; defect nucleation; nanostructures; kinetic Monte Carlo
Source: Web Of Science
Added: July 10, 2023

2020 journal article

Competition between shear localization and tensile detwinning in twinned nanowires

PHYSICAL REVIEW MATERIALS, 4(2).

By: S. Yin*, G. Cheng n, Y. Zhu n & H. Gao*

Source: Web Of Science
Added: March 23, 2020

2020 journal article

In-situ TEM study of dislocation interaction with twin boundary and retraction in twinned metallic nanowires

ACTA MATERIALIA, 196, 304–312.

author keywords: Dislocation slip; Twin boundary; Recoverable plasticity; MD simulations; In-situ TEM
Source: Web Of Science
Added: August 31, 2020

2019 journal article

Atomic structure of gamma '' phase in Mg-Gd-Y-Ag alloy induced by Ag addition

PHILOSOPHICAL MAGAZINE, 99(16), 1957–1969.

By: X. Sha*, L. Xiao*, X. Chen*, G. Cheng n, Y. Yu*, D. Yin*, H. Zhou*

author keywords: Mg alloys; precipitation; HAADF-STEM; microstructural analysis
Source: Web Of Science
Added: May 20, 2019

2019 journal article

Hydrogen embrittlement in metallic nanowires

NATURE COMMUNICATIONS, 10.

TL;DR: The authors combine nanomechanical testing and molecular dynamics simulations to show that hydrogen can suppress surface dislocation nucleation in silver nanowires. (via Semantic Scholar)
Source: Web Of Science
Added: May 20, 2019

2019 journal article

In Situ Nano-thermomechanical Experiment Reveals Brittle to Ductile Transition in Silicon Nanowires

NANO LETTERS, 19(8), 5327–5334.

author keywords: Brittle to ductile transition; dislocation; plasticity; silicon nanowire; in situ TEM
TL;DR: In situ high resolution TEM imaging and atomistic reaction pathway modeling reveal that the unconventional ½〈110〉{001} dislocations become highly active with increasing temperature and thus play a critical role in the formation of deformation bands, leading to transition from brittle fracture to dislocation-mediated failure in Si nanowires at elevated temperatures. (via Semantic Scholar)
Source: Web Of Science
Added: September 3, 2019

2019 journal article

Transition of Deformation Mechanisms in Single-Crystalline Metallic Nanowires

ACS NANO, 13(8), 9082–9090.

By: S. Yin*, G. Cheng n, G. Richter*, H. Gao* & Y. Zhu n

author keywords: dislocation slip; twinning; plasticity; nanowire; in situ TEM
TL;DR: Using in situ transmission electron microscopy tensile tests and molecular dynamics simulations, an additional factor, cross-sectional shape, is reported that can affect the competition between the deformation mechanisms in single crystalline FCC metallic NWs. (via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Source: Web Of Science
Added: September 23, 2019

2017 journal article

Anomalous Tensile Detwinning in Twinned Nanowires

PHYSICAL REVIEW LETTERS, 19(25).

TL;DR: Using quantitative in situ transmission electron microscopy based nanomechanical testing and molecular dynamics simulations, a transition of the deformation mechanism from localized dislocation slip to delocalized plasticity via an anomalous tensile detwinning mechanism in bitwinned metallic NWs is reported. (via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Source: Web Of Science
Added: August 6, 2018

2017 journal article

On the origin and behavior of irradiation-induced c-component dislocation loops in magnesium

ACTA MATERIALIA, 131, 457–466.

author keywords: In situ transmission electron microscopy; C-component dislocation loop; Atomic structure; Magnesium; Stacking faults
Sources: Web Of Science, NC State University Libraries, ORCID
Added: August 6, 2018

2016 journal article

Evolution of Irradiation-Induced Vacancy Defects in Boron Nitride Nanotubes

SMALL, 12(6), 818–824.

By: G. Cheng n, S. Yao n, X. Sang n, B. Hao*, D. Zhang*, Y. Yap*, Y. Zhu n

author keywords: boron nitride; nanotubes; electron irradiation; TEM; irradiation-induced defects; vacancy defects
TL;DR: Irradiation-induced vacancy defects in multiwalled (MW) boron nitride nanotubes are investigated via in situ high-resolution transmission electron microscope operated at 80 kV, with a homogeneous distribution of electron beam intensity. (via Semantic Scholar)
Source: Web Of Science
Added: August 6, 2018

2016 journal article

On the size-dependent elasticity of penta-twinned silver nanowires

EXTREME MECHANICS LETTERS, 8, 177–183.

By: T. Chang n, G. Cheng n, C. Li n & Y. Zhu n

author keywords: Nanowires; Nanomechanics; Elasticity size effect
Source: Web Of Science
Added: August 6, 2018

2015 journal article

Design and operation of silver nanowire based flexible and stretchable touch sensors

JOURNAL OF MATERIALS RESEARCH, 30(1), 79–85.

By: Z. Cui n, F. Poblete n, G. Cheng n, S. Yao n, X. Jiang n & Y. Zhu n

UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

2015 journal article

Large anelasticity and associated energy dissipation in single-crystalline nanowires

Nature Nanotechnology, 10(8), 687–691.

Contributors: G. Cheng n, C. Miao*, Q. Qin n, J. Li n, F. Xu n, H. Haftbaradaran*, E. Dickey n, H. Gao*, Y. Zhu n

TL;DR: It is shown that single-crystalline ZnO and p-doped Si nanowires can exhibit anelastic behaviour that is up to four orders of magnitude larger than the largest anelastically observed in bulk materials, with a timescale on the order of minutes, suggesting that crystalline Nanowires with point defects are promising materials for energy damping applications. (via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries, Crossref
Added: August 6, 2018

2015 journal article

Recoverable plasticity in penta-twinned metallic nanowires governed by dislocation nucleation and retraction

NATURE COMMUNICATIONS, 6.

TL;DR: A dislocation-mediated, time-dependent and fully reversible plastic behaviour in penta-twinned silver nanowires is reported, which originates from the surface nucleation, propagation and retraction of partial dislocations. (via Semantic Scholar)
Source: Web Of Science
Added: August 6, 2018

2015 journal article

Strain Hardening and Size Effect in Five-fold Twinned Ag Nanowires

NANO LETTERS, 15(6), 4037–4044.

By: S. Narayanan*, G. Cheng n, Z. Zeng*, Y. Zhu n & T. Zhu*

author keywords: Nanowire; twin boundary; strain hardening; size effects; in situ experiment; molecular dynamics
TL;DR: This work provides mechanistic insights into enhancing the tensile ductility of metallic nanostructures by engineering the internal interfaces and defects by nanomechanical testing and atomistic modeling. (via Semantic Scholar)
Source: Web Of Science
Added: August 6, 2018

2014 journal article

A new metastable precipitate phase in Mg-Gd-Y-Zr alloy

PHILOSOPHICAL MAGAZINE, 94(21), 2403–2409.

By: H. Zhou n, W. Xu n, W. Jian n, G. Cheng n, X. Ma n, W. Guo*, S. Mathaudhu n, Q. Wang*, Y. Zhu n

author keywords: magnesium alloys; metastable phases; base-centred orthorhombic structure; phase transformations
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2014 journal article

Mechanical Properties of Silicon Carbide Nanowires: Effect of Size-Dependent Defect Density

NANO LETTERS, 14(2), 754–758.

By: G. Cheng n, T. Chang n, Q. Qin n, H. Huang* & Y. Zhu n

author keywords: Size effect; ultrahigh strength; in situ tensile testing; brittle fracture; nanomechanics
TL;DR: The SiC NWs are found to deform linear elastically until brittle fracture, and their fracture origin is identified in the 3C structures with inclined SFs, rather than the highly defective structures. (via Semantic Scholar)
Source: Web Of Science
Added: August 6, 2018

2013 journal article

Dislocations with edge components in nanocrystalline bcc Mo

Journal of Materials Research, 28(13), 1820–1826.

By: G. Cheng n, W. Xu n, W. Jian n, H. Yuan n, M. Tsai n, Y. Zhu n, Y. Zhang*, P. Millett*

Contributors: G. Cheng n, W. Xu n, W. Jian n, H. Yuan n, M. Tsai n, Y. Zhu n, Y. Zhang*, P. Millett*

Sources: NC State University Libraries, ORCID, NC State University Libraries
Added: August 6, 2018

2013 journal article

In-situ atomic-scale observation of irradiation-induced void formation

NATURE COMMUNICATIONS, 4.

By: W. Xu n, Y. Zhang*, G. Cheng n, W. Jian n, P. Millett*, C. Koch n, S. Mathaudhu, Y. Zhu n

TL;DR: In-situ atomic-scale observation of the nucleation and growth of voids in hexagonal close-packed magnesium under electron irradiation shows that the initial growth in length is controlled by slow nucleation kinetics of vacancy layers on basal facets and anisotropic vacancy diffusivity, and the subsequent thickness growth is driven by thermodynamics to reduce surface energy. (via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2013 journal article

Morphology, structure and composition of precipitates in Al0.3CoCrCu0.5FeNi high-entropy alloy

INTERMETALLICS, 32, 329–336.

By: M. Tsai n, H. Yuan n, G. Cheng n, W. Xu n, K. Tsai*, C. Tsai*, W. Jian n, C. Juan* ...

Contributors: M. Tsai n, H. Yuan n, G. Cheng n, W. Xu n, K. Tsai*, C. Tsai*, W. Jian n, C. Juan* ...

author keywords: Precipitates; Microstructure; Widmanstatten morphology; Electron microscopy; transmission
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2013 journal article

Physics and model of strengthening by parallel stacking faults

Applied Physics Letters, 103(13), 133108.

By: W. Jian n, G. Cheng n, W. Xu n, C. Koch n, Q. Wang*, Y. Zhu n, S. Mathaudhu n

Sources: Web Of Science, Crossref, NC State University Libraries
Added: August 6, 2018

2013 journal article

Significant hardening due to the formation of a sigma phase matrix in a high entropy alloy

INTERMETALLICS, 33, 81–86.

By: M. Tsai n, H. Yuan n, G. Cheng n, W. Xu n, W. Jian n, M. Chuang*, C. Juan*, A. Yeh* ...

Contributors: M. Tsai n, H. Yuan n, G. Cheng n, W. Xu n, W. Jian n, M. Chuang*, C. Juan*, A. Yeh*, S. Lin*, Y. Zhu n

author keywords: Age-hardening; Precipitates; Electron microscopy, transmission
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

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