A Molecular Dynamics Study of Ag-Ni Nanometric Multilayers: Thermal Behavior and Stability

Area of Science:

• Materials Science
• Condensed Matter Physics
• Computational Materials Science

Background:

• Nanometric multilayers of immiscible metals present unique interfacial phenomena.
• Understanding metal interfaces is crucial for developing advanced materials and devices.

Purpose of the Study:

• To investigate the interfacial behavior of silver (Ag) and nickel (Ni) nanometric multilayers using molecular dynamics simulations.
• To analyze strain, defect formation, and relaxation at the Ag-Ni interface under varying temperatures.

Main Methods:

• Molecular dynamics (MD) simulations were employed to model Ag-Ni nanometric multilayers.
• Analysis included in-plane strain, defect formation, and atomic mobility at different temperatures.
• Simulations also examined triple junctions and grain boundary grooving dynamics.

Main Results:

• Increasing temperature enhanced atomic mobility and led to partial dissolution of Ni in amorphous Ag.
• Grain boundary grooving was observed at high temperatures (900-1000 K), with distinct roles for Ni and Ag mobilities.
• At 1100 K, the Ag layer transitioned to an amorphous/pre-melt state, inducing Ni grain rearrangement.

Conclusions:

• Temperature significantly influences the interfacial structure and dynamics of Ag-Ni nanometric multilayers.
• The study elucidates the mechanisms of atomic diffusion, dissolution, and phase transitions at metal interfaces.
• Findings provide insights into the behavior of immiscible metal systems relevant to materials engineering.