Study on Viscosity of Zr-Cu Alloys Based on Viscosity Measurement and Hirai Model

In this paper, the viscosity of molten Zr50Cu50 alloy was measured by using NaF-CaF2 covering slag protection combining rotating cylinder method firstly under non-vacuum melting condition. The curve of viscosity and temperature was acquired stably in the temperature range from 1370K to the liquidus temperature (1208K). According the Arrhenius equation form, the viscosity-temperature relation of molten Zr50Cu50 alloy can be fit as the following equation: eta = 1.90 x 10(-23) exp(530398/RT) (1208K<T<1370K) The viscosity of molten Zr50Cu50 alloy can be calculated by the above equation in the range of 1370 to 1208K. The viscosity values of molten Zr50Cu50 alloy calculated by Hirai model are relatively small, so the corrected Hirai model was obtained by the measured viscosity data. The viscosities of molten Zr-Cu alloys can be expressed by the following corrected Hirai model: eta = A exp(B/RT) A = 9.01x10(-5) rho(2/3) T-m(1/2) M-1/6/exp(RT/B-m) B = 138.46T(m)(1.27) The viscosities of typical molten Zr-Cu alloys were calculated by the above corrected model. The results showed that the viscosities of Zr-Cu alloys are larger at the respective liquidus temperature. The fundamental data were provided for researching the relationship between viscosities of molten Zr -Cu alloys and amorphous form ability.