Tensile and fatigue properties of ultrafine Cu-Ni multilayers

Tensile and fatigue properties of Cu-Ni multilayers with different nominal individual layer thicknesses (lambda) (10-100 nm) on a polyimide substrate were investigated. The nominal yield strength and fatigue strength of the multilayer/polyimide composite as a function of. were determined. The experimental results indicate that both yield and fatigue strengths increase as. decreases until. is less than 20 nm. Tensile and fatigue cracking behaviour were examined to understand the damage mechanism of the ultrafine metallic multilayers.