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Power-law scaling and fractal nature of medium-range order in metallic glasses D.Ma, A. D. Stoica and X.-L.Wang* The atomic structure of metallic glasses has been a long-standing scientific problem. Unlike crystalline metals, where long-range ordering is established by periodic stacking of fundamental building blocks known as unit cells, a metallic glass has no long-range translational or orientational order, although some degrees of short- and medium-range order do exist 1–3 . Previous studies1–4 have identified solute- (minority atom)-centred clusters as the fundamental building blocks or short-range order in metallic glasses. Idealized cluster packing schemes, such as efficient cluster packing on a cubic lattice1 and icosahedral packing3 as in a quasicrystal, have been proposed and provided first insights on themedium-range order in metallic glasses. However, these packing schemes break down beyond a length scale of a fewclusters.Here, on the basis of neutron and X-ray diffraction experiments, we propose a new packing scheme—self-similar packing of atomic clusters. We show that the medium-range order has the characteristics of a fractal network with a dimension of 2.31, and is described by a power-law correlation function over the medium-range length scale. Our finding provides a new perspective of order in disordered materials and has broad implications for understanding their structure–property relationship, particularly those involving a change in length scales. http://www.namipan.com/d/26a3733 ... 9ade525a1a89f2b2500 http://www.namipan.com/d/26a373380ea5dc1e9c01dd1849f179ade525a1a89f2b2500 |
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