ELASTIC WAVES AND THEIR COLLISIONS WITH N-CROWDIONS IN 3D COMPUTER MODEL OF HCC Ni CRYSTAL

10.25712/ASTU.1811-1416.2022.01.002

Abstract

In this paper the conditions of excitation of longitudinal elastic waves in different directions and the results of their collisions with N-crowdions in a three-dimensional computer model of the HCC lattice of Ni crystal are considered by molecular dynamics using the Morse potential. It is known that any perturbations in the crystal lattice of a boundless crystal excite only longitudinal waves. When the model cell is an elongated rectangular parallelepiped, the longitudinal wave propagating along the direction of the dense packing of atoms at an angle to the most elongated side of the cell experiences multiple reflections from the walls resulting in a transverse component of this wave relative to the longest face of the model cell. A counter collision of this wave with N-crowdion having supersonic velocity and consisting of two or three interstitial atoms was modeled. The velocities of N-crowdions ranged from 1.3×10⁴ to 1.8×10⁴ m/s. In all cases, after N-crowdion collision with a wave having a transverse component, N-crowdion was rearranged into a crowding complex oriented along the direction of the longitudinal wave, which experienced multiple reflections from the walls of the model cell.