Effect of Cooling Rate on Microstructures during Solidification of Liquid GeReportar como inadecuado




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A molecular dynamics simulation has been performed on the solidification process of liquid metal Ge by adopting the Stillinger-Weber potentials at three different cooling rates. Through the pair correlation function,bond-type index method, self-diffusion coefficient DT, the microstructures have been analyzed during rapid solidification processes. It is found that random network amorphous solids are formed at the cooling rate of 1×1012K-s, 1×1013K-s and 1×1014K-s. The influence of cooling rate on the system is only shown under 1000K. At lower cooling rate, the bond angle, coordination number and bond type are more close to the crystal structure of Ge, and crystallization occurs more obvious.

KEYWORDS

liquid metal Ge; Stillinger-Weber potential; solidification process; molecular dynamics simulation;

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Autor: Chang-yin Zhu, Quan Xie, Ting-hong Gao

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



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