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Citation: Wang Li, Yi Su, Bian XiuFang. Atom Clusters in Liquid and Amorphous of Ni3Al Alloy[J]. Acta Physico-Chimica Sinica, ;2002, 18(04): 297-301. doi: 10.3866/PKU.WHXB20020403 shu

Atom Clusters in Liquid and Amorphous of Ni3Al Alloy

1.
The key Laboratory of Liquid Structure and Heredity of Materials,Ministry of Education, Shandong University, Jinan 250061;The Inspection Institute on Boiler Pressure Vessel of Shandong, Jinan　250013

Received Date: 19 September 2001
Available Online: 15 April 2002

A series of simulation of the evolution of atom clusters in liquid Ni3Al alloy during rapid solidification have been performed under constant pressure and temperature by molecular dynamic simulation technique. TB(tightbinding) potential function has been adopted to describe the interaction between atoms. The structure parameters such as pair correlation function, bonded pairs and polyhedra clusters have been used to characterize the dependence of the type and number of clusters on temperature during rapid cooling process. The cluster structure could be visualized clearly through the conversion of atom coordinates obtained by simulation to threedimension graphical interface. The number of liquid Ni3Al clusters at the temperature of 2 000 K is small and all are made up of diicosahedron; however, it increases rapidly at the cooling rate of 4×1013 K•s－1, and finally,the icosahedra clusters occur at low temperature. The network consists of the icosahedra and diicosahedra clusters forming an amorphous system.
- Molecular dynamic simulation;Rapid cooling process;Network of icosahedra clusters;Amorphous structure
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