Numerical Study of Plastic Ploughing of Nanosized Polycrystalline Titanium under Scratching

AY Nikonov and AR Shugurov, PROCEEDINGS OF THE ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES, 2051, 020214 (2018).

DOI: 10.1063/1.5083457

The article describes the nucleation and development of plastic deformation in a nanosized titanium polycrystal subjected to scratching, using the molecular dynamics method. It is established that the development of plastic deformation as well as the mechanical properties and the residual depth of scratch grooves of individual grains are determined by the difference in their crystallographic orientations. The mechanisms of plastic ploughing of the material during the passage of the indenter through grain boundaries and twin boundaries are analyzed. It is shown that the internal borders play an important role not only as a barrier to dislocation movement, but also contribute to the manifestation of rotational deformation modes. The simulation results show a good qualitative and, in some cases, a quantitative agreement with the available experimental data.

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