Mobility of Ni versus Zr in an amorphous Nihyphen;Zr alloy

摘要

A method for determining the dominant diffusing constituent in a binary amorphous alloy is demonstrated with the Nihyphen;Zr system. Nickel is the dominant moving species in an amorphous Nihyphen;Zr alloy near theahyphen;Ni50Zr50composition at 250thinsp;deg;C. In comparison to the Ni, the Zr has a negligible mobility under similar thermodynamic driving forces. Rutherford backscattering spectrometry is used to measure the change in the concentration of a thin film of Ni between thick amorphous layers. Based upon the change in the Ni profile, the diffusivity of Ni in an amorphous Nihyphen;Zr alloy is between 1times;10minus;17and 1times;10minus;16cm2/s at 250thinsp;deg;C.