An Assessment of Binary Metallic Glasses: Correlations Between Structure, Glass Forming Ability and Stability (Preprint)
Journal article preprint
AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIR METALS CERAMICS AND NONDESTRUCTIVE EVALUATION DIV/METALS BRANCH
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This manuscript explores the influence of atomic structure on glass-forming ability and thermal stability in binary metallic glasses. A critical assessment gives literature data for 629 alloys from 175 binary glass systems. The atomic structure is quantified for each alloy using the efficient cluster-packing model. Comparison of atomic structure with amorphous thickness and thermal stability gives the following major results. Binary glasses show a strong preference for discrete solute-to-solvent atomic radius ratios, R, that give efficient local atomic packing. Of fifteen possible R values, only five are common and only four represent the most stable glasses. The most stable binary glasses are also typically solute-rich, with enough solute atoms, alpha, to fill all the solute sites and roughly 113 of the solvent sites. This suggests that anti-site defects, where solutes occupy solvent atom sites, are important in the glass-forming ability of the most stable glasses. This stabilizing effect results from an increase in the number of more stable solute-solvent bonds in solute-rich glasses.
- Metallurgy and Metallography
- Atomic and Molecular Physics and Spectroscopy