Eur. Phys. J. B (2017) 90: 16
https://doi.org/10.1140/epjb/e2016-70388-7

Regular Article

Molecular dynamics simulation of the plastic behavior anisotropy of shock-compressed monocrystal nickel

¹ Key Laboratory of Plasma, Air Force Engineering University, X'ian 710038, P.R. China
² State Key Laboratory for Manufacturing Systems Engineering, School of Mechanical Engineering, X'ian Jiaotong University, X'ian 710049, P.R. China

^a e-mail: 164369979@qq.com

Received: 21 June 2016
Received in final form: 18 August 2016
Published online: 25 January 2017

Abstract

Molecular dynamics simulations were used to study the plastic behavior of monocrystalline nickel under shock compression along the [100] and [110] orientations. The shock Hugoniot relation, local stress curve, and process of microstructure development were determined. Results showed the apparent anisotropic behavior of monocrystalline nickel under shock compression. The separation of elastic and plastic waves was also obvious. Plastic deformation was more severely altered along the [110] direction than the [100] direction. The main microstructure phase transformed from face-centered cubic to body-centered cubic and generated a large-scale and low-density stacking fault along the family of { 111 } crystal planes under shock compression along the [100] direction. By contrast, the main mechanism of plastic deformation in the [110] direction was the nucleation of the hexagonal, close-packed phase, which generated a high density of stacking faults along the [110] and [1̅10] directions.