Efficient Local Packing in Metallic Glasses
AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE
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A simple topological model in an earlier manuscript has shown that efficient atomic packing is a fundamental principle in the formation of metallic glasses. An approach for defining and quantifying the local packing efficiency, P. was developed for solute-centered clusters that contained only solvent atoms in the first coordination shell. In the present research. this methodology is extended to allow quantification of P when more than one atomic species is present in the first coordination shell. This analysis is applied to several metallic glasses using published data of atom radii and partial coordination numbers. It is shown that packing is generally very efficient, and that the values of P obtained for the metallic classes are essentially identical to the values obtained from a similar analysis of the competing crystalline structures. These results are consistent with frequent reports of topological short range ordering in metallic glasses. and are inconsistent with a structural model on dense random packing of atoms.
- Ceramics, Refractories and Glass
- Metallurgy and Metallography