Microstructure, indentation and work hardening of Cu/Ag multilayers

Instrumented indentation and tensile tests were performed on free standing Cu/Ag multilayer thin films with layer thicknesses in the range 0.85 - 900 nm. The effect of layer thickness can be described by a Hall - Petch relationship. The work-hardening rate in the tensile test depends on layer thickness, which indicates that the interfaces create storage sites for dislocations and follows an inverse power law.