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Dislocation Nucleation and Interaction Under Nanoindentation in Single Crystalline Al and Cu (Simulations by Molecular Dynamics)
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Molecular dynamics simulations of nanoindentation in single-crystal aluminum and copper were used to analyze how dislocations nucleate and interact beneath an indenter tip, finding critical stress thresholds for the transition from elastic to plastic behavior at the nanoscale. These results advance understanding of nano-plasticity relevant to ultra-small mechanical contacts and MEMS devices.
Recent advances in miniaturization and high-accuracy measurement techniques have allowed us to measure the mechanical properties at the nanometer scale. Nanoindentation has been widely used because of its applicability under ambient conditions. Unstable displacement burst, that is abrupt growth of indent depth after homogeneous elastic deformation observed in crystalline materials, is one of the unique plastic deformation (nanoplasticity). In the present paper, we perform a series of atomistic simulations of nanoindentation in single crystalline Al and Cu to analyze the critical state for dislocation nucleation and interaction between dislocations beneath the indenter. Referring Hertzian solution based on the isotropic linear elastic theory, we attentively disscuss the anisotropic effect and the nonlinear behavior under nanoindentation. Consequently, it is found that incipient yield process is strongly related to the triaxial stress state created beneath the indenter, and that energetically unfavorable interactions accompanied with cross slip induce the formation of prismatic dislocations.
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Dislocation Nucleation and Interaction under Nanoindentation in Single Crystalline Al and Cu: Molecular Dynamics Simulations
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This study uses molecular dynamics simulations to investigate dislocation nucleation and interaction during nanoindentation of single-crystalline Al and Cu, providing atomic-scale insight into the displacement burst (pop-in) phenomenon.
Nanoindentation-Induced Collective Dislocation Behavior and Nanoplasticity
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The crystallographic dependence of displacement burst behavior — abrupt plastic deformation events during nanoindentation — was characterized in single-crystal aluminum and copper with three surface orientations. The results show that the critical indent load for the first displacement burst depends strongly on crystal surface orientation, reflecting the underlying dislocation nucleation mechanisms.
Nanoindentation-Induced Collective Dislocation Behavior and Nanoplasticity
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2017 An Evaluation of Nanoindentation-Induced Displacement Burst and Collective Dislocation Motion Based on Discrete Dislocation Mechanics and Elastic Energy of Dislocations
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Researchers built computational models to explain the "displacement burst" — a sudden jump in material deformation during nanoindentation — as arising from the collective emission of dislocations in crystalline materials. This work improves understanding of the earliest stages of plastic deformation at the nanoscale.
Theoretical Investigation of the Displacement Burst Observed in Nanoindentation by Collective Dislocation Loops Nucleation Model
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A simplified theoretical model is presented to predict the first "displacement burst" seen during nanoindentation of crystals, treating it as the collective nucleation of dislocation loops. The model provides a quantitative framework for interpreting nanoplastic behavior in pristine crystalline materials.
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