Beilstein J. Nanotechnol.2018,9, 3013–3024, doi:10.3762/bjnano.9.280
starvation [27]. This dislocation starvation also implies that the work hardening mechanism, which is based on dislocationinteractions, is not active. However, current literature suggests that the active deformation mechanism in npAu is dislocation slip [28] and that dislocation starvation is not effective
stress–strain curves as a result of dynamic strain aging (DSA) [56]. DSA is related to dislocationinteractions with obstacles in the lattice, which may be other lattice defects or solute atoms. The effect is activated at high strain (and thus desorption) rates, where solutes fail to keep up with the
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Figure 1:
Current I (black) and corresponding strain ε (red) as functions of the applied potential U during a...
Beilstein J. Nanotechnol.2013,4, 173–179, doi:10.3762/bjnano.4.17
radius is reduced below 1.3 Å we observe a transition from displacive plasticity to solid-state amorphisation.
Keywords: dislocationinteractions; mechanical properties; molecular dynamics; nanoparticle; simulation; Introduction
In macroscopic metals, the plastic flow is carried by the continuous
activity (stacking faults within the encapsulated material even though the extruded material was not crystalline) and thermodynamical arguments stating the insufficient speed of diffusion for vacancy-assisted creep in the experimental system. Yet, neither dislocation nucleation nor dislocationinteractions
observed dislocation accumulation in nanograined materials [10][11]. We report novel dislocationinteractions activated by the high pressure and dislocation density, and low dislocation length in the nanoparticle. We also show that the dislocation activity becomes suppressed as the extrusion hole radius is
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Figure 1:
Two observed modes of plasticity. (a) Snapshot of the extrusion from a 15.6 Å orifice showing the d...