Peculiarities of Plastic Deformation Nucleation in Nanocrystalline Vanadium under Shear Loading

D Kryzhevich and K Zolnikov and A Korchuganov, PROCEEDINGS OF THE ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES, 2051, 020156 (2018).

DOI: 10.1063/1.5083399

A molecular dynamics study of the nucleation and development of plasticity in nanocrystalline vanadium under shear loading has been carried out. The simulated sample consisted of grains with large angles of misorientations relative to each other. The nucleation of plasticity in crystallite was realized by moving dislocations from volume of grains to their boundaries. As a result, the degree of nonequilibrium of the grain boundaries increased, which led to an increase in the ductility of the sample. With shear loading, tensile and compressive stresses arise and increase at the interfaces and joints of grains. Nanopore was formed at the joints of grains with tensile stresses. Due to the small number of grains, the behavior of the sample was anisotropic with respect to the change in the direction of shear.

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