In situ TEM study of mechanical behaviour of twinned nanoparticles

  title={In situ TEM study of mechanical behaviour of twinned nanoparticles},
  author={Gilberto Casillas and Juan Pedro Palomares-B{\'a}ez and Jos{\'e} Luis Rodr{\'i}guez-L{\'o}pez and Junhang Luo and Arturo Ponce and Rodrigo Esparza and J. Jes{\'u}s Vel{\'a}zquez-Salazar and Abel Hurtado-Mac{\'i}as and J. Gonz{\'a}lez-Hern{\'a}ndez and Miguel Jos{\'e}-Yacam{\'a}n},
  journal={Philosophical Magazine},
  pages={4437 - 4453}
There is strong interest in studying changes in mechanical properties with reducing grain size. The rational is that consequent dislocation glide cannot be sustained, resulting in an increase in material strength. However, this comes with the cost of a reduction in ductility. It has been shown that coherent twin boundaries in nanostructured Cu improve the ductility to 14% [Lu et al., Science 324 (2009) p. 349]. In this paper, we report for the first time the compression of individual… 
Orientation-dependent deformation mechanisms of bcc niobium nanoparticles
Abstract Nanoparticles usually exhibit pronounced anisotropic properties, and a close insight into the atomic-scale deformation mechanisms is of great interest. In present study, atomic simulations
Anisotropic Deformation in the Compressions of Single Crystalline Copper Nanoparticles
Atomistic simulations are performed to probe the anisotropic deformation in the compressions of face-centred-cubic metallic nanoparticles. In the elastic regime, the compressive load-depth behaviors
Atomistic deformation mechanisms in twinned copper nanospheres
This study performs molecular dynamic simulations to investigate the compression response and atomistic deformation mechanisms of twinned nanospheres and finds that the strengthening of TBs depends strongly on the twin spacing.
Application of In-Situ Mechanics Approach in Materials Science Problems
The in-situ characterization approach can be utilized to develop insights into the mechanics of a wide diversity of materials. This chapter introduces the application of in-situ mechanical
Influence of hydrogenation on the mechanical properties of Pd nanoparticles
Atomic simulations are conducted to investigate the influence of hydrogenation on the mechanical properties of Pd nanoparticles. It is found that with an increase in the H atom content both the
Integrating in situ TEM experiments and atomistic simulations for defect mechanics
Abstract With recent advances in computational modeling and in situ transmission electron microscopy (TEM) technologies, there have been increased efforts to apply these approaches to understand
Hardness and Elastic Modulus on Six-Fold Symmetry Gold Nanoparticles
The chemical synthesis of gold nanoparticles (NP) by using gold (III) chloride trihydrate (HAuCl∙3H2O) and sodium citrate as a reducing agent in aqueous conditions at 100 °C is presented here. Gold
Mechanical behaviour of nanoparticles: Elasticity and plastic deformation mechanisms
Nano-objects often exhibit drastically different properties compared to their bulk counterpart, opening avenues for new applications in many fields, such as in advanced composite materials,
Interfacing In-Situ Mechanics with Image Correlation and Simulations
In-situ characterization in conjunction with analytical and computational tools can be useful to extract qualitative and quantitative information pertaining to the deformation of materials. This
Mechanical properties of nanoparticles: basics and applications
The special mechanical properties of nanoparticles allow for novel applications in many fields, e.g., surface engineering, tribology and nanomanufacturing/nanofabrication. In this review, the basic


Atomistic studies of defect nucleation during nanoindentation of Au(001)
Atomistic studies are carried out to investigate the formation and evolution of defects during nanoindentation of a gold crystal. The results in this theoretical study complement the experimental
Nanoindentation size effect in single-crystal nanoparticles and thin films: A comparative experimental and simulation study
This work studies the strength dependence of single-crystal metal specimens of submicrometer size on their dimensions. The emphasize is on the plasticity mechanisms controlled by nucleation of
Near-ideal strength in gold nanowires achieved through microstructural design.
It is discovered that special defects can be utilized to approach the ideal strength of gold in nanowires by microstructural design by atomistic simulations of near-ideal strength in pure Au nanowire with complex faceted structures related to realistic Nanowires.
Revealing the Maximum Strength in Nanotwinned Copper
The maximum strength of nanotwinned copper samples with different twin thicknesses is investigated, finding that the strength increases with decreasing twin thickness, reaching a maximum at 15 nanometers, followed by a softening at smaller values that is accompanied by enhanced strain hardening and tensile ductility.
Size dependence of mechanical properties of gold at the micron scale in the absence of strain gradients
Classical laws of mechanics hold that mechanical properties are independent of sample size; however, results of experiments and molecular dynamics simulations indicate that crystals exhibit strong
Incipient plasticity of twin and stable/unstable grain boundaries during nanoindentation in copper
An incipient plastic deformation of several types of grain boundaries subjected to nanoindentation was investigated by atomistic simulations. Our previous study showed that the dislocation nucleation
Deformation twinning in nanocrystalline materials
Abstract Nanocrystalline (nc) materials can be defined as solids with grain sizes in the range of 1–100 nm. Contrary to coarse-grained metals, which become more difficult to twin with decreasing
Interactions between non-screw lattice dislocations and coherent twin boundaries in face-centered cubic metals
In a first report [Jin ZH, Gumbsch P, Ma E, Albe K, Lu K, Hahn H, et al. Scripta Mater 2006;54:1163], interactions between screw dislocation and coherent twin boundary (CTB) were studied via
Effects of elastic anisotropy on strain distributions in decahedral gold nanoparticles.
A detailed analysis of the internal structure of a decahedral Au nanoparticle is presented using aberration-corrected high-resolution electron microscopy and strain mapping to confirm the presence of a disclination and show the effect of elastic anisotropy on the strain state in these nanoparticles.
Discrete plasticity in sub-10-nm-sized gold crystals
In situ high-resolution transmission electron microscopy observations show that in sharp contrast to what happens in bulk materials, partial dislocations emitted from free surfaces dominate the deformation of gold (Au) nanocrystals, and provide direct experimental evidence for the vast amount of theoretical modelling on theDeformation mechanisms of nanomaterials that have appeared in recent years.