Shear deformation mechanical performance of Ni-Co alloy nanoplate by molecular dynamics simulation

Ni-Co alloy has great advantages in the fields of micro-electromechanical systems and aerospace, however, the lack of micro-deformation mechanism restricts its industrial application. Herein, the deformation mechanism and microstructure evolution of Ni-Co alloy nanoplate under shear loading are investigated by MD. The yield strength increases gradually with the increase of the velocity, and the highest shear modulus is 111.43 GPa. The stress concentration leads to the nucleation and expansion of the dislocation, and the stacking fault expands with the dislocation motion, swallowing most of the disordered atoms. By Dislocation Extraction Algorithm (DXA), it is found that Shockley and Perfect dislocations make a major role, and the interactions between dislocations are responsible for the high mechanical properties. As the temperature increases, the yield strength decreases significantly, the stress fluctuations in the plastic phase at 100 K and 200 K are greater compared to other temperatures. Meanwhile, the coherence of the dislocations motion decreases, and the atoms in the stacking faults are scattered, leading to the decreasing of area. The above results are helpful for the design and control of nanoelectronic facilities and provide a significant guide for the industrial applications of Ni-Co alloy nanoplate.

Automated summary

The study investigates the deformation mechanism and microstructure evolution of Ni-Co alloy nanoplate under shear loading using molecular dynamics simulation, revealing the major role of Shockley and Perfect dislocations and their interactions in determining the mechanical properties of the material. The coherence of dislocations motion decreases with increasing temperature, leading to a decrease in area due to scattering of atoms in stacking faults.