Enhanced elastic moduli in Cuhyphen;Ni films with compositional modulation

摘要

Films with modulated composition 8hyphen;Aring; Cu/8hyphen;Aring; Ni show an increase in the Youngrsquo;s and torsional moduli of a factor of 2, relative to bulk or longerhyphen;wavelength samples. The film structure is found to be highly textured with coherent lamella for the shorthyphen;wavelengthhyphen;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.thinsp;