The structure and dynamic viscosity of molten metal In in the temperature range from 280 to 750℃ and investigated by using a high-temperature X-ray diffractometer and a torsional oscillation viscometer. The experiments show that the nearest interatomic distance r1 and the corrdination number Ns of In melt decrease with increasing temperature from 280 to 750℃. The viscosity of In melt drops as temperature increases and meets on the whole the whole the exponential relation. Thermal contraction of atom clusters can be found in the heating process. The sudden change in structure or noticeable contraction occurs in the range of 390-550℃. The anomalous change of viscosity is measured at about 430 and 470℃, which is in good accordance with that of structure. A theoretical discussion on the correlation of struture and viscosity of In melt is given in this paper.

The effects of thermkal-rate treatment technique on the critical thickness of glass formation for an Al85Ni10Ce5 alloy melt have been investigated. The amorphous ribbon of the alloy with a thickness of 300μm is obtained using a single-roller melt-spinning technique by the thermal-rate tteatment, while that of 50μm is obtained at conventional melt superheavitn condition. The experiment shows that the coordiantion numbers of the Al85Ni10Ce5 alloy melt decreases from 12 to 9 with increasing melt temperature from 900 to 1200℃. The relationship between the corrdination numbers, the first position of the main peak of the alloy melt and the critical cooling rate for getting amorphous alloys has been discussed.

The structrues of molten Cu-23% Sn alloy at different temperatures have determined by using a high-teperature X-ray diffractometer. It has been found that there exist not only short-range order (SRO) structure but also medium-range order (MRO) structure in the molten alloy. The medium-range order structure in the alloy melt is a function of temperature. There exist obvious medium-range order structure at the range of temperatures from 900 to 1200℃. The medium-range order structure disappears when the temperature reaches 1300℃. the temperature dependence of the dynamic viscosity of the alloy melt has been measured using a torsional oscillation viscometer. It has been found that there is an abnormal change in the relationship between the temperature and the viscosity of the alloy melt. The abnormity change is consistent with the transformation from medium-range order to short-range order in the alloy melt.

Viscosities of Al85Ni15 alloy melt and the Al-Ni-based melts with the addition of Ce, Cu, and Mn have been measured by an oscillating vessel viscometer. Liquidus temperatures of those alloys have been determined using differential scanning calorimetry (DSC). A high temperature area (HTA) and a low temperature area (LTA) can be used to describe the viscosity behavior. LTA is in the range of 100℃ above liquidus. The activation energy of LTA is much higher than that of HTA. Variation of activation energy with temperature of Al-Ni-based melts was found for the first time. The relationship between the glass formability and viscosity of the alloy melts has been discussed.