The Effects of Cooling Rate on Cluster Structures during Rapid Solidification of Liquid Ca7Mg3 AlloyReportar como inadecuado




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A simulation study has been performed for the solidification of liquid Ca7Mg3 alloy at different cooling rates by molecular dynamics method. The pair distribution function gr curves and the cluster-type index method were used to analyze the changes of cluster structures during rapid solidification processes. The results show that Ca7Mg3 has very good glass forming ability, and amorphous structures are formed mainly with the basic cluster 12 0 12 0 at the cooling rate of 1×1011K-s, 1×1012K-s, 1×1013K-s and 1×1014K-s. The effects of cooling rate on the structure during solidification process of liquid Ca7Mg3 alloy is mainly reflected by changes in the number of the 12 0 12 0 basic clusters. The basic cluster 12 0 12 0 plays a key role in forming amorphous structure during rapid solidification processes. At lower cooling rate, more number of the 12 0 12 0 basic clusters are formed, which make the amorphous structure more stable.

KEYWORDS

Liquid Ca7Mg3 alloy; Solidification process; Cluster-type index method; Cluster structure

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Autor: Ting-hong Gao, Quan Xie, Chang-yin Zhu, Rang-su Liu, Li-li Zhou

Fuente: http://www.scirp.org/



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