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The structure determines the property of materials, while observing the microstructure is a challenge in experiments. With molecular dynamics (MD) simulation, the solidification of Si50Ge50 nanoparticles is extensively investigated in terms of the potential energy, the pair distribution function, and several parameters based on the largest standard cluster analysis. It is found that Si50Ge50 nanodroplets is cooled into a crystal without element segregation through four stages, including the initial liquid, the rapid growth, the critical-nuclei crystalline (CNC) state, and the steady growth. The saturation of the covalent bond is satisfied before the directionality in the crystallization process. Interestingly, at the CNC state, the average size of the crystalline structure is independent of temperature but depends on the cooling rate; and the heritability of basic crystalline atoms is not over 50% until the end of the CNC state. These results deepen the understanding of the structural evolution during the rapid cooling of Si50Ge50 nanodroplets and provide useful guidelines for the preparation of alloy nanodevices.

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