Thermal Stability and Mechanical Properties of Metallic Multilayers

Metallic multilayers are engineered assemblies of alternating nanometre-thick metal films that exploit high interface density to achieve superior mechanical strength, thermal resistance and functional stability. By tailoring layer thickness, composition and residual stress, researchers tune microstructural features such as grain size, defect populations and interfacial cohesion. These parameters govern phenomena like vacancy-mediated diffusion, interface stress relaxation and phase transformations under elevated temperatures. Applications span protective coatings for microelectronics, wear-resistant surfaces in aerospace, heat-dissipation elements in power devices and novel joining techniques in energy systems. The mechanical performance of such multilayers derives from impeded dislocation motion at interfaces, while thermal stability depends on delayed interdiffusion and controlled grooving at grain boundaries. Optimising these multilayer architectures demands a fundamental understanding of the interplay between atomic-scale processes at interfaces and macroscopic property evolution during service conditions.

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Thermal Stability and Mechanical Properties of Metallic Multilayers publication trend

The graph below shows the total number of articles in thermal stability and mechanical properties of metallic multilayers across all publications each year (not limited to Nature Index journals).

Technical terms

Nanomultilayer: A structure composed of alternating metallic layers with thicknesses on the nanometre scale, often designed to tailor functional properties.

Interface stress: The local mechanical stress confined to the boundary between two layers, influencing cohesion and deformation behaviour.

Vacancy-driven diffusion: Atom migration facilitated by vacant lattice sites, crucial to thermal degradation and phase transformation.

Premelting: Partial loss of crystallinity at an interface or grain boundary below the bulk melting temperature, affecting mechanical integrity.

Grain-boundary grooving: The formation of groove-like features at grain intersections during annealing, indicative of material transport and surface energy minimisation.

References

1. Experimental and ab initio derivation of interface stress in nanomultilayered coatings: Application to immiscible Cu/W system with variable in-plane stress. Applied Surface Science (2024).
2. Explaining the effect of in-plane strain on thermal degradation kinetics of Cu/W nano-multilayers. Scripta Materialia (2024).
3. A Molecular Dynamics Study of Ag-Ni Nanometric Multilayers: Thermal Behavior and Stability. Nanomaterials (2023).