Molecular dynamics study of size, temperature and strain rate effects on mechanical properties of gold nanofilms

Gan, Yong; Chen, J. K.

doi:10.1007/s00339-008-4970-8

Cited by 26 publications

(13 citation statements)

References 41 publications

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“…This is in agreement with those reported recently for BCC Mo nanowires with 〈110〉 and 〈111〉 orientations [30]. An increase in yield strength with increasing size has been observed for [0001] and [1120 ] Ti and 〈100〉 Au nanopillars [31][32][33]. The increase in yield strength of Ti nanopillars has been attributed to the variations of surface energy with nanowire size [33].…”

Section: Discussionsupporting

confidence: 91%

Molecular dynamics simulations on size dependent tensile deformation behaviour of [110] oriented body centred cubic iron nanowires

Sainath

Choudhary

2015

Materials Science and Engineering: A

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Section: Discussionsupporting

confidence: 91%

Molecular dynamics simulations on size dependent tensile deformation behaviour of [110] oriented body centred cubic iron nanowires

Sainath

Choudhary

2015

Materials Science and Engineering: A

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“…Finally, the results in Figures 7 and 8 also demonstrate that the strength of the Ni 3 Sn 4 nanowires would rise with the increase of the nanowire diameter. This size effect has also been observed in many literature studies [18,49,51]. The significant size effect may be mainly due to the surface effects of nanocrystals, including surface energy [52], surface stress [53], and surface relaxation [54], and the effects are strongly dependent on the surface to volume ratio.…”

Section: Resultssupporting

confidence: 64%

Size, Temperature, and Strain‐Rate Dependence on Tensile Mechanical Behaviors of Ni₃Sn₄ Intermetallic Compound Using Molecular Dynamics Simulation

Cheng

Chen

2014

Journal of Nanomaterials

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This study focuses on exploring the mechanical properties and nonlinear stress-strain behaviors of monoclinic Ni3Sn4single crystals under uniaxial tensile test and also their size, temperature, and strain-rate dependence through constant temperature molecular dynamics (MD) simulation using Berendsen thermostat. The deformation evolution of the Ni3Sn4atomic nanostructure during the tensile test is observed. In addition, the tensile yield strains of various Ni3Sn4single crystals at different strain rates and temperatures are characterized through unloading process. At last, by way of linear regression analysis, the corresponding normal elastic stiffness constants are approximated and then compared with the literature theoretical data. The radial distribution function analysis shows that Ni3Sn4single crystal in a one-dimensional nanowire configuration would become a highly disordered structure after thermal equilibration, thereby possessing amorphous-like mechanical behaviors and properties. The initial elastic deformation of Ni3Sn4single crystal is governed by the reconfiguration of surface atoms, and its deformation evolution after further uniaxial tensile straining is characterized by Ni=Sn bond straightening, bond breakage, inner atomic distortion, cross-section shrinking, and rupture. The calculated normal elastic constants of Ni3Sn4single crystal are found to be consistent with the literature theoretical data.

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“…In this case, we expect that the strength is almost sample size independent. Nevertheless, surface stress induced weakening in material strength is quite common and has been widely observed in many other scenarios [20][21][22][23].…”

Section: Strength Controlled By Dislocation Nucleation On Surfaces: Amentioning

confidence: 99%

When ‘smaller is stronger’ no longer holds

2018

Materials Research Letters

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Smaller is stronger' has been a well-established tenet for the mechanical strength of smallvolume single crystals. However, emerging evidence suggests that this trend does not always hold in the deep sub-micrometre regime (< ∼ 10 2 nm) when surface-mediated displacive and diffusive processes dominate. Here we present a perspective to highlight typical scenarios in which the single-crystal strength is influenced by surface stresses, diffusion-mediated surface creep, or dislocation-starvation-engendered high-stresses in the crystal interior, leading to 'smaller is weaker' or 'plateau limited by ideal strength'. Such an unusual size dependence/independence of strength has implications for the reliability and stability of nano-structured devices. IMPACT STATEMENTDue to significant surface effects, single crystals in the deep sub-micron regime ( < ∼ 10 2 nm) can be 'smaller is weaker' or reach a 'saturated strength plateau', defying the well-known 'smaller is stronger' trend. ARTICLE HISTORY

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Molecular dynamics study of size, temperature and strain rate effects on mechanical properties of gold nanofilms

Cited by 26 publications

References 41 publications

Molecular dynamics simulations on size dependent tensile deformation behaviour of [110] oriented body centred cubic iron nanowires

Molecular dynamics simulations on size dependent tensile deformation behaviour of [110] oriented body centred cubic iron nanowires

Size, Temperature, and Strain‐Rate Dependence on Tensile Mechanical Behaviors of Ni₃Sn₄ Intermetallic Compound Using Molecular Dynamics Simulation

When ‘smaller is stronger’ no longer holds

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Molecular dynamics study of size, temperature and strain rate effects on mechanical properties of gold nanofilms

Cited by 26 publications

References 41 publications

Molecular dynamics simulations on size dependent tensile deformation behaviour of [110] oriented body centred cubic iron nanowires

Molecular dynamics simulations on size dependent tensile deformation behaviour of [110] oriented body centred cubic iron nanowires

Size, Temperature, and Strain‐Rate Dependence on Tensile Mechanical Behaviors of Ni3Sn4 Intermetallic Compound Using Molecular Dynamics Simulation

When ‘smaller is stronger’ no longer holds

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Size, Temperature, and Strain‐Rate Dependence on Tensile Mechanical Behaviors of Ni₃Sn₄ Intermetallic Compound Using Molecular Dynamics Simulation