Existence of fractal packing in metallic glasses: Molecular dynamics simulations of C u46 Z r54

Jianrui Feng, Pengwan Chen, Mo Li

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摘要

The recently advocated power-law scaling for fractal packing in amorphous metals is examined in a metallic glass under hydrostatic pressure. We show that the scaling relation va∼q1-ζ between the sample molar volume va and the first peak position q1 in the scattering function exhibits a varying exponent ζ from 2.77 to 3.72 in different stages of compression, rather than a constant as the universal fractal dimensionality. Fractal packing of short- and medium-range icosahedral clusters is found to exist but undetectable with high angle scattering. Therefore, the substructure of the metallic glass does not contribute to the power-law exponent. Moreover, we show that the space filling contributed from different alloy components with varying atomic sizes is overlooked in the scaling relation that gives rise to the so-called fractal dimension. The amorphous packing of metallic glasses is actually compact with dimension 3.

源语言英语
文章编号024201
期刊Physical Review B
98
2
DOI
出版状态已出版 - 2 7月 2018

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Feng, J., Chen, P., & Li, M. (2018). Existence of fractal packing in metallic glasses: Molecular dynamics simulations of C u46 Z r54. Physical Review B, 98(2), 文章 024201. https://doi.org/10.1103/PhysRevB.98.024201