Structural Response of Metal Crystallite with BCC Lattice on Atomic Level under Nanoindentation

Abstract:

Molecular dynamics investigation of metal crystallite with bcc lattice under nanoindentation was carried out. Potentials of interatomic interactions were calculated on the base of the approximation of the embedded atom method. The potentials chosen make it possible to describe with a high accuracy the elastic and surface properties of the simulated metal and energy parameters of defects, which is important for solution of the task posed in the work. For clarity and simpler indentation data interpretation, an extended cylindrical indenter was used in the investigation and loading was realized by its lateral surface. The simulated crystallite had a parallelepiped shape. The loaded plane of crystallite was modeled as a free surface while the positions of atoms in the opposite plane of crystallite were fixed along the indentation direction. Other planes of crystallite were simulated as free surfaces. The indenter velocity varied from 5 to 25 m/s in different calculations. The loading of the model crystallite was realized at 300 K. Influence of interfaces (free surfaces and grain boundaries) on peculiarities of plastic deformation nucleation and interactions of generated structural defects with interfaces in simulated crystallite under nanoindentation were investigated.

• Periodical: Key Engineering Materials (Volumes 592-593)
• Pages: 55-58
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.592-593.55
• Online since: November 2013
• Authors: Dmitrij Sergeevich Kryzhevich, Aleksandr Vyacheslavovich Korhuganov, Konstantin Petrovich Zolnikov, Sergei Grigorievich Psakhye
• Keywords: Defects Formation, Molecular Dynamic (MD), Nanoindentation, Plastic Deformation

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