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A numerical investigation of the stability of nanometer-sized amorphous structures

机译：纳米非晶结构稳定性的数值研究

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Molecular dynamics methods have been employed to investigate the structural stability at 300 K of nanometer-sized particles of a Cu-Mg metallic glass in the size range between 1 and 6 nm. All the particles considered undergo a crystallization process the rate of which depends on the system size. On the contrary, the amorphous structure of the corresponding massive system is stable at 300 K. The final products of the crystallization process of the nanometer-sized particles are similar to the ones obtained from the crystallization of the massive system at 600 K, also studied for comparison. The mechanistic features are instead different and point out a relationship between particle size and crystallization rate. Such relationship indicates that crystallization spontaneously occurs at 300 K only for particles with radius smaller than about 10 nm. In turn, this suggests that a minimum size exists below which the amorphous structure is no longer stable.
机译：已经采用分子动力学方法研究了尺寸在1至6 nm之间的Cu-Mg金属玻璃的纳米级颗粒在300 K下的结构稳定性。所考虑的所有颗粒均经历结晶过程，其速率取决于系统尺寸。相反，相应质量体系的无定形结构在300 K时是稳定的。纳米级颗粒的结晶过程的最终产物类似于在600 K时从质量体系的结晶中获得的产物。为了比较。相反，机械特征是不同的，并且指出了粒度与结晶速率之间的关系。这种关系表明，仅对于半径小于约10 nm的粒子，结晶会在300 K时自发发生。反过来，这表明存在最小尺寸，在该最小尺寸以下，非晶结构不再稳定。

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