Method for Measuring Viscosity of Metallic Glass-forming Liquid

A method,covering slag technology combining rotating cylinder method,was proposed for measuring the viscosity of metallic glass-forming liquid,and the viscosity of molten Zr50Cu50 alloy was measured.The results show that,between the temperature range from 1373 K to 1233 K,the viscosity of the molten alloy increases exponentially with the decrease of temperature,which accords with Arrhenius formula well.However,when the temperature is lower than 1233 K,the viscosity value sharply increases,and the viscosity value reaches 2.415 Pa·s at the liquidus temperature,which obviously does not accord with Arrhenius formula.The viscosity of Zr50Cu50 alloy melt is three orders of magnitude higher than that of some other alloys.The analysis indicates that the higher viscosity is beneficial for improving the glass forming ability.