Ni self-diffusion in Zr-Ni(-Al) melts

Abstract

We report on investigations on the atomic dynamics in melts of different binary Zr-Ni alloys and of the ternary glass-forming Zr60Ni25Al15 alloy. The liquids are containerlessly processed in an electromagnetic levitator that is combined with quasielastic neutron scattering at the time of flight spectrometer TOFTOF of the FRM II. Ni self-diffusion coefficients are determined that exhibit an Arrhenius-type temperature dependence with comparatively large activation energies ranging between 0.64 and 0.90 eV. Although glass forming abilities and melting temperatures for these alloys exhibit large differences, the absolute values of the self-diffusion coefficients are similar at same temperature.