CAJ | 학술논문

The structure and dynamic viscosity of In80Cu20 alloy melt in the temperature range from 600 ℃ to 1 000℃ were investigated by using a high-temperature X-ray diffractometer and a torsional oscillation viscometer. The experiments show that there exist medium range order (MRO) structures in In80Cu20 alloy melt in a low temperature range above liquidus. The MRO structures are weakened with increasing temperature and disappear when the temperature surpasses 800 ℃. The nearest interatomic distance r1 and the coordination number Ns of In80Cu20 alloy melt decrease as temperature increases from 650 ℃ to 1 000 ℃. Thermal contraction of atom clusters can be found in the heating process. The viscosity of In80Cu20 alloy melt drops as temperature increases and meets with the exponential relation. No sudden change in structure occurs in the measured temperature range. DSC curve of In80Cu20 alloy during cooling process was measured. It is found that there is no noticeable variation of heat during cooling from 1000 ℃ to 600 ℃ , which testifies further that there is no sudden change in structure of In80Cu20 alloy melt.