Simulation and experimental analysis of nanoindentation and mechanical properties of amorphous NiAl alloys

Abstract

This paper used numerical and experimental methods to investigate the mechanical properties of amorphous NiAl alloys during the nanoindentation process. A simulation was performed using the many-body tight-binding potential method. Temperature, plastic deformation, elastic recovery, and hardness were evaluated. The experimental method was based on nanoindentation measurements, allowing a precise prediction of Young's modulus and hardness values for comparison with the simulation results. The indentation simulation results showed a significant increase of NiAl hardness and elastic recovery with increasing Ni content. Furthermore, the results showed that hardness and Young's modulus increase with increasing Ni content. The simulation results are in good agreement with the experimental results. Adhesion test of amorphous NiAl alloys at room temperature is also described in this study.

Nanomechanical properties of imprinted amorphous NiAl alloys using atomic simulations

“…Motion of atoms in the thermostatic and Newtonian layers follows the Newton's second law. Furthermore, the velocity rescaling method is performed on the equilibration for 30 ps at 300 K. Besides, the van der Waals interactions of C-Ni and C-Al are governed by Lennard-Jones potential [5] and the potential energy between Ni and Al atoms can be calculated utilizing the second-moment approximation of the many-body tight-binding (SMA-TB) equation [6]. To increase the computation efficiency the periodic boundary conditions are imposed on the x and y axes and, importantly, to have a structural stability of Ni-Al atoms throughout the imprinting process, the lowest bottom layer of the substrate atoms has been fixed.…”

“…Micromold embossing and imprinting technologies are known to be easy accessible and low-cost techniques to fabricate the various micro components [3]. However, despite the fact that the plenty of experimental and numerical studies has been performed [4,5], the quantitative evaluation of the nanoimprinting process of amorphous NiAl alloy is still not yet fully understood. In response, the purpose of this paper is to quantitatively study the mechanical properties of the amorphous NiAl alloy during the imprinting process utilizing the molecular dynamics (MD) simulations.…”

Atomistic assessment of structural evolution for magnesium during hypervelocity nanoprojectile penetration

“…The strengthening mechanism is studied for coated graphene in metal nanocomposites by nanoindentation by MD simulations [25]. MD simulation was performed on Ni using the many-body tight-binding potential method to perform nanoindentation for evaluating Young's modulus and hardness values [26]. Indentation of SiO2/Si bilayer composite is studied to determine the stress relaxation behavior using MD simulations [27]; The mechanical properties of single-crystal diamonds were also determined using molecular dynamics during nanoindentation using MD simulations [28].…”