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We investigate a metallic glass-forming (GF) material (Al90Sm10) exhibiting afragile-strong (FS) glass-formation by molecular dynamics simulation to betterunderstand this highly distinctive pattern of glass-formation in which many ofthe usual phenomenological relations describing relaxation times and diffusionof OGF liquids no longer apply, and where instead genuine thermodynamicfeatures are observed in response functions and little thermodynamic signatureis exhibited at the glass transition temperature, Tg. Given the many unexpectedsimilarities between the thermodynamics and dynamics of this metallic GFmaterial with water, we first focus on the anomalous static scattering in thisliquid, following recent studies on water, silicon and other FS GF liquids. Inparticular, we quantify the 'hyperuniformity index' H of our liquid whichprovides a quantitative measure of molecular 'jamming'. To gain insight intothe T-dependence and magnitude of H, we also estimated another more familiarmeasure of particle localization, the Debye-Waller parameter $<u^2>$ describingthe mean-square particle displacement on a timescale on the order of the fastrelaxation time, and we also calculate H and $<u^2>$ for heated crystalline Cu.This comparative analysis between H and $<u^2>$ for crystalline and metallicglass materials allows us to understand the critical value of H on the order of$10^{-3}$ as being analogous to the Lindemann criterion for both the melting ofcrystals and the 'softening' of glasses. We further interpret the emergence ofFS GF and liquid-liquid phase separation in this class of liquids to arise froma cooperative assembly process in the GF liquid.

Approach to Hyperuniformity in a Metallic Glass-Forming Material Exhibiting a Fragile to Strong Glass Transition