Structural evolution induced in the equilibrium immiscible Cu–V system by ionirradiation

Abstract

In the equilibrium immiscible Cu–V system, interesting structural evolution was observedin the Cu–V multilayers upon 200 keV xenon ion beam mixing at 77 K. In the Cu30V70sample, a unique amorphous phase was formed. In the Cu74V26sample, an amorphous phase was partially formed and it transformed, after anover-irradiation dose, into a mixture of fcc and bcc solid solutions. The latticeconstants of the fcc and bcc solid solutions were determined to be much largerthan those of Cu and V, respectively, and can probably be attributed to a strongrepulsive interaction between the Cu and V atoms. The observed structuralevolution was discussed in terms of a thermodynamic calculation based onMiedema’s theory and in terms of atomic collision triggered by ion irradiation.