MD study of scratching-induced deformation in nanosized polycrystalline titanium with coherent and incoherent twins boundaries

Abstract

The article describes the results of molecular dynamics modeling of scratch induced plastic deformation in a nanosized titanium polycrystalline. Coherent and incoherent twins are in the focus of present research. It is established that the development of plastic deformation is determined by the twin boundary type. In the case of incoherent twin boundary there is a nanofragmentation of the material and the curvature of the boundary plane. For the crystallite with coherent twin boundary, the plastic deformation is possible due to the reorientation of the twin lattice into the matrix lattice. This is due to the perfect similarity of two lattices and the lower specific energy of such a defect. These results make it possible to understand better the features of the development of plastic deformation in the surface layers of materials with hcp structure.