Existence of two twinning-mediated plastic deformation modes in Au nanowhiskers

Sedlmayr, Andreas; Bitzek, Erik; Gianola, Daniel S.; Richter, Gunther; Mönig, Reiner; Kraft, O.

doi:10.1016/j.actamat.2012.03.018

Cited by 128 publications

(107 citation statements)

References 39 publications

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“…With the adjustments for the surface stress, one is able to predict the stress of dislocation nucleation in large gold nanowires. Table 4.1 shows the strengths of our nanowires [75] and those of recent experiments [64,66] showing good agreement.…”

Section: Atomistics Simulations Of Dislocation Nucleationsupporting

confidence: 52%

“…The type of plasticity observed in these materials, such as slip via perfect dislocations and deformation twinning appears to be dependent on both wire orientation as well as geometry. These findings, originally predicted by atomistic simulations, are being validated by a number of experiments on pristine nanowires [45,63,64,66,77,78,80].…”

Section: Chapter 4 Dislocation Nucleation From Free Surfacesmentioning

confidence: 91%

“…To compute this in atomistic simulations, we use gold as a model material as it has been used extensively in both micro-compression experiments [11,15,23,24,42,70] and nanowire experiments [45,64,66,78]. Five different geometries were studied: two orientations 100 and 110 and three cross sectional geometries: square, circular and rhombic.…”

Section: Atomistics Simulations Of Dislocation Nucleationmentioning

confidence: 99%

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The fundamentals of plastic deformation : several case studies of plasticity in confined volumes.

Weinberger

2012

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Plasticity in small volumes is significantly different than in large, bulk-like specimens. The strength of materials in the micron and sub-micron regime depends not only on the microstructure but also on the size of the material. Given that a number of important mechanical processes occur at these length scales, it is important to build a comprehensive understanding of these materials and processes. This work examines several different processes in small volumes. The motion of dislocations in the drag regime are examined as a function of material volume which exhibits higher drag than in the bulk. The stability of single arm sources are also investigated using molecular dynamics. Finally, dislocation nucleation from the free surface is investigated using both atomistic as well as continuum models. These results provide a better understanding of plastic processes in confined volumes.3 Acknowledgment

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Section: Atomistics Simulations Of Dislocation Nucleationsupporting

confidence: 52%

Section: Chapter 4 Dislocation Nucleation From Free Surfacesmentioning

confidence: 91%

Section: Atomistics Simulations Of Dislocation Nucleationmentioning

confidence: 99%

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The fundamentals of plastic deformation : several case studies of plasticity in confined volumes.

Weinberger

2012

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“…[16,17] Whether these superdislocations also carry the plastic deformation during the compression of the Ni 3 Al nanocubes, or whether a change in deformation mechanism like, e.g. in pristine fcc NWs [8,9] takes place has so far not been studied.…”

mentioning

confidence: 99%

“…[3,4] Furthermore, the nature of dislocation-based elementary mechanisms itself may become size-dependent at the nanoscale, where plasticity based on partial dislocations and deformation twinning (DT) can replace bulk-like ordinary dislocation plasticity (ODP). [3,[5][6][7][8][9] Most of the studies on small-scale plasticity were performed on face centered cubic (fcc) metals. Only recently more work on body centered cubic (bcc), hexagonally closed packed (hcp) and more complex alloys is being performed.…”

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confidence: 99%

Atomistic Simulations of Compression Tests on Ni₃Al Nanocubes

Amodeo

Begau

Bitzek

2014

Materials Research Letters

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Supplementary Material Available OnlineThe deformation behaviour of nano-sized Ni 3 Al cubes with {100} side surfaces is investigated under uniaxial compression using constant-temperature molecular dynamics simulations at 300 K. The simulations reproduce key features of recently performed nanocompression experiments, namely the lack of strain hardening, homogeneous deformation of the entire sample and overall high stress levels of the order of 3-5 GPa. According to the simulations, the critical initial step is the formation of a pseudo-twin structure, which then further deforms by Shockley partial dislocations. These deformation mechanisms differ significantly from bulk Ni 3 Al and are rationalized in terms of generalized stacking fault energies and resolved shear stresses.

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A Review on Size‐Dependent Mechanical Properties of Nanowires

Esfahani

Alaca

2019

Adv Eng Mater

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The primary challenge to exploit the nanowire as a truly one‐dimensional building block in nanoscale devices is the clear incorporation of scale effects into the operational performance. Size‐dependent behavior in physical properties of nanowires is the subject of intense experimental and computational studies for more than two decades. In this review, the measurement techniques and computational approaches to study scale effects on mechanical properties of nanowires are reviewed for fcc metallic, silicon, and zinc oxide structures. Advantages and disadvantages of each measurement tool are summarized with data reported in the literature. A similar comparison is carried out for computational techniques. Contradictions in the literature are highlighted with an assessment of research needs and opportunities, among which the plastic behavior of gold nanowires and elastic properties of silicon nanowires can be primarily mentioned. Furthermore, challenges associated with the coupling of measurement methods and modeling approaches are summarized. Finally, points of agreement between experimental measurements and computational studies are discussed paving the way for the utilization of nanowires in future nanoscale devices.

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Existence of two twinning-mediated plastic deformation modes in Au nanowhiskers

Cited by 128 publications

References 39 publications

The fundamentals of plastic deformation : several case studies of plasticity in confined volumes.

The fundamentals of plastic deformation : several case studies of plasticity in confined volumes.

Atomistic Simulations of Compression Tests on Ni₃Al Nanocubes

A Review on Size‐Dependent Mechanical Properties of Nanowires

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Existence of two twinning-mediated plastic deformation modes in Au nanowhiskers

Cited by 128 publications

References 39 publications

The fundamentals of plastic deformation : several case studies of plasticity in confined volumes.

The fundamentals of plastic deformation : several case studies of plasticity in confined volumes.

Atomistic Simulations of Compression Tests on Ni3Al Nanocubes

A Review on Size‐Dependent Mechanical Properties of Nanowires

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Atomistic Simulations of Compression Tests on Ni₃Al Nanocubes