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【期刊论文】Variation of activation energy in Al-Ni-based alloy melts
边秀房, Xiufang Bian, Minhua Sun *, Wu Lei, Cheng Sujuan
Materials Research Bulletin 37(2002)1451-1458,-0001,():
-1年11月30日
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.
A., Metals, A., Amorphous materials, C., Differential scanning calorimetry (, DSC), , D., Diffusion
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【期刊论文】Cluster structure and dynamics of liqiuid aluminum under cooling conditions
边秀房, Li Hiu a), Wang Guanghou, Zhao Jijun, Bian Xiufang
,-0001,():
-1年11月30日
The thermal evolution and dynamics properties of small clusters in melt are investigated by molecular dynamics simulation with 500 particles. The interatomic ineraction is described by a well-fitted semiempirical tight binding potential. We have studied some solidlike clusters and structural properties of liquid aluminum. The atomic volume, internal energy, pair correlaion function, and bonded pairs in liqiud are obtained from quick cooling and slow cooling simulation. A comparison between the slow and quick cooling process reveals that the cooling rate significantly affects the evolution route of various clusters in liqiud aluminum. Our results show that glass contains a lot of 1551 and 1541 five-fold symmetry clusters. On the contrary, the crystal has some 1421 and 1422 clusters corresponding to a face-centered cubic structure and hexagonal closing-packedstructure. This work gives clear physical insight of the structure evolution form liquid to solid.
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【期刊论文】Structural studies of clusters in melt of FeAl compound
边秀房, Li Hui, Ding Feng and Wang Jinlan, Bian Xiufang, Wang Guanghou
,-0001,():
-1年11月30日
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.
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【期刊论文】Microstructure selecion map for rapidly solidified Al-rich Al-Ce alloys
边秀房, Zhonghua Zhang a, *, Yan Wang b, Xiufang Bian a
Journal of Crystal Growth 260(2004)557-565,-0001,():
-1年11月30日
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.
Al., Microstructure, Al., X-ray diffraction, Al., Transmission electron microscopy, A2., Rapid solidification, B1., Al-Ce alloys
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【期刊论文】Molecular dynamics study of the local oreder and defects in quenched states
边秀房, Li Hiu, , *, Bian Xiufang, and Wang Guanghou
PHYSICAL REVIEW B 67, 094202 (2003),-0001,():
-1年11月30日
Empirical tight binding model potentials have been used in molecular dynamics simulations of local order and defects in liquid and glass under high and normal pressures. Results are reported for some solidilike cluster and for structural properties of liquid and glass. Not only are Frank-Kasper polyhedra and Bernal hole polyhedra detected, but also a varity of defective icosahedra. Adramatic split of the second peak of g (r) is associated with the glass transition. The split of the second peak is caused by the fluidity of the liquid phase in glass. The nearest distance is shortened, and the nearest-neighbor corrdination number increase under high pressure. High pressure favors glass formation. The microstructure of glass is very similar to medium range order icosahedra structure.
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