By means of constant pressure molecular dynamics simulation technique, a series of simulations of the Fe50Al50 alloy have been carried out. The atoms interact via semi-empirical n-body noncentral potential. The pair correlation functions and the pair analysis technique is applied to reveal the cluster evolution in the process of quick solidification. By using the bond orientaion order parameters, we have measured both local and extended orientaion symmetries for computer-generated models of dense liquid and glass. A lot of polyhedra in liquid systems, e.g., icosahedra, are also obtained. In order to test the reliance of the computational results, corresponding x-ray diffracion experiments have been performed on the material.

The effects of rapid solidification on the microstructure of Al-8Ce, Al-20 Ce and Al-36.6 Ce (wt%) alloys has been invesigated using X-ray diffraction, canning electon microscopy and transmisson electron microscopy. A microstructure selecion map has been esbablished for the rapidly solidified Al-rich Al-Ce alloys. Rapid solidification has no effect on the phase constitution but has a marked effect on the microstructure of the Al-8 Ce and Al-20 Ce alloys. For the Al-36.6 Ce alloy, however, rapid solidification has a significant effect on both the microstructure and the phase constitution.

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.

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.