Mechanical properties of AlCu film alloys prepared by thermal diffusion

Mechanical properties of AlCu alloys deposited by thermal evaporation on Kapton substrates and formed by thermal diffusion were investigated. Formation of an Al₂Cu phase was confirmed by XPS technique. Surface morphology was examined by AFM and SEM before and after tension mechanical testing. Stress-strain curves of the alloy film were obtained by subtracting the effect of the Kapton substrate from that of the film-Kapton system. Reduction of the elastic modulus and improved ductility of the AlCu alloys with increasing of thickness were found. A decrement in the surface rms-roughness and an increment of the grain size after tensile testing were found.