AuCu249合金团簇热稳定性的原子尺度计算研究
Computational study on thermal stability of an AuCu249 alloy cluster on the atomic scale
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摘要: 采用基于嵌入原子法的NVT正则系综分子动力学方法,在原子尺度上计算了包含249个原子的金属间化合物AuCu249合金团簇由固态转变为熔体的结构演化过程.根据对分布函数、原子密度分布函数和主要原子键对数目随温度的变化,发现在温度从低温升到高温的过程中,合金团簇内伴随着原子的连续位置交换,团簇呈现由外及里的分阶段结构转变.同时还发现在团簇内原子堆积结构转变过程中,Au原子出现由团簇内层向外层运动的趋势,而Cu原子则有由外层向内层运动的趋势.Abstract: Structural change of an AuCu intermetallic alloy cluster including 249 atoms during heating is studied by molecular dynamics simulation within the framework of embedded atom method.The analyses of pair-distribution function,atomic density function,and pair analysis technique show that the structural change of this cluster involves different stages from the outer part into the inner part owing to continuously interchanging positions among atoms at elevated temperature.During the change of the atom packing structure,gold atoms move from the inner part to the outer part of this cluster,whereas copper atoms move from the outer part into the inner part.
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