Direct atomic-scale evidence for shear–dilatation correlation in metallic glasses

Atomic Dynamics in Metallic Liquids and Glasses

How atoms move in metallic glasses and liquids is an important question in discussing atomic transport, glass formation, structural relaxation and other properties of metallic glasses. While the concept of free-volume has long been used in describing atomic transport, computer simulations and isotope measurements have shown that atomic transport occurs by a much more collective process than ass...

Fractal atomic-level percolation in metallic glasses.

Metallic glasses are metallic alloys that exhibit exotic material properties. They may have fractal structures at the atomic level, but a physical mechanism for their organization without ordering has not been identified. We demonstrated a crossover between fractal short-range (<2 atomic diameters) and homogeneous long-range structures using in situ x-ray diffraction, tomography, and molecular ...

Correlation of mechanical properties in bulk metallic glasses with 27

We report 27Al NMR and magnetic susceptibility measurements of Zr and ZrHf-based bulk metallic glasses (BMGs). 27Al NMR Knight shift shows that there exists a clear correlation between the local electronic properties at Al sites and mechanical properties. In addition, magnetic susceptibility measurements also provide clues on the influence of the electronic states, especially the strong influen...

Nanometer-scale solute clustering in aluminum!/nickel!/ytterbium metallic glasses

The transformation sequence of melt-spun Al!/5.2at.% Ni!/6.8at.% Yb is characterized by X-ray diffraction, differential scanning calorimetry (DSC), and atom-probe field-ion microscopy. An isochronal DSC thermogram detects three major exothermic transformation steps, with onset temperatures of 180, 292, and 327 8C, respectively. Atom-probe analyses reveal the evolution of compositional inhomogen...

Superconductivity in Metallic Glasses