Enhanced elastic moduli in Cu-Ni films with compositional modulation

Abstract
Films with modulated composition 8-Å Cu/8-Å Ni show an increase in the Young’s and torsional moduli of a factor of 2, relative to bulk or longer-wavelength samples. The film structure is found to be highly textured with coherent lamella for the short-wavelength-enhanced moduli samples, but becomes more random with the probable introduction of misfit dislocations at longer wavelengths. The moduli results support the previous findings of Tsakalakos and Hilliard.