In-5%Cu合金的液态结构与粘滞性研究

Study on Liquid Structure and Viscosity of In-5%Cu Alloy

利用高温液态金属X射线衍射仪研究了In-5%Cu合金熔体的结构。结果表明:随温度由400℃升高到900℃,In-5%Cu合金熔体的平均最近邻原子间距r1总体上呈现出减小的趋势,原子配位数Ns的变化比较复杂,r1和Ns都在600℃左右出现转折,原子团簇出现热收缩现象,其结构在600℃附近出现异常变化。利用回转振动粘度仪对In-5%Cu合金在液相线以上不同温度进行粘度测量的结果表明:随温度升高,In-5%Cu合金熔体的粘度值减小,总体上呈现指数变化规律,在600℃左右发生突变。粘度突变温度与结构突变温度一致。

The structure of In-5%Cu alloy melt was studied at 400degreesC, 600degreesC, 700degreesC, 800degreesC, 900degreesC, respectively, by using a high-temperature X-ray diffractometer. The experimental results show that with increasing temperature from 400degreesC to 900degreesC, the nearest interatomic distance r(1) of In-5% Cu alloy melt decreases on the whole. The change in the coordination number Ns is complicated. The transition of r(1) and N-S occurs at about 600degreesC. Thermal contraction phenomenon of atom clusters can be found. An anomalous change in structure occurs at about 600T. The dynamic viscosity of In-5% Cu alloy was measured at different temperatures above liquidus by using a torsional oscillation viscosimeter. The results show that the viscosity of In-5% Cu alloy melt decreases as temperature increases and meets the exponential correlation on the whole. A sudden change in viscosity occurs at about 600degreesC. The sudden change temperature of viscosity is in accordance well with that of structure, which suggests that the viscosity has a close relation to the structure of melt.