In this study, the mechanical response and impact resistance of nanotwinned Ti-Ni-V shape memory alloys are investigated using molecular dynamics (MD) simulations. Specifically, the deformation mechanisms of the alloy subjected to the impact of a spherical Silicon nanoparticle were analyzed using the LAMMPS software and the MEAM interatomic potential. To elucidate the strengthening role of twin boundaries, the impact behavior of structures with varying twin layer configurations (monolayer, bilayer, and trilayer) was compared under impact velocities of 10, 12, and 14 eV/Å. The simulation results reveal that structures with a higher density of twin boundaries (bilayer and trilayer) exhibit significantly superior structural strength and resistance to indentation compared to monolayer structures. This enhancement is attributed to the twin boundaries acting as effective barriers against dislocation propagation. Furthermore, the analysis of stress-interaction force curves indicates that while higher impact velocities reduce the lattice recovery time, the presence of nanotwins consistently improves the material's load-bearing capacity. These findings provide theoretical insights for optimizing the microstructure of Ti-Ni-V alloys for applications requiring high impact resistance.
