深过冷Ni-15%Sn合金熔体表面张力研究

Surface tension of a highly supercooled Ni-15% Sn alloy melt

在电磁悬浮下实现了Ni-15%Sn合金的深过冷,最大过冷度为265K(0.16TL),结合悬浮液滴振荡法实验测定了Ni-15%Sn合金在1368—1915K范围内的表面张力.实验表明,在所测量温度范围内,表面张力随温度增加,连续线性递减,函数关系式为σNi-15%Sn=1316.7—1.01(T-TL)mN/m.根据表面张力的实验数据,理论计算了该合金的黏度系数和扩散系数,并在此基础上研究了合金的扩散激活能ED和黏液活化能Eη等.

The surface tension of supercooled liquid Ni-15 % Sn alloy was measured by the electromagnetic oscillating drop method over a wide temperature range from 1368 to 1915K. The maximum supercooling of 265K （0.16 TL ） was achieved. Over the temperature range investigated, the measured surface tension shows a linear property expressed by αNi-15%Sn=1316.7-1.01（T-TL）mN/m. On the basis of experimental data, the viscosity and the diffusion coefficient of Ni-15 % Sn melt were derived, and we also analyzed the activation energy for viscous flow and diffusion.