Abstract
Microfluidic Shear Flow Instabilities in Injection Molded Glassy Metal are investigated. The formation of microfluidic shear flows instabilities involving the presence of different viscosities fluids has been observed in injection molded Bulk Metallic Glasses. The complex rheology of injection molded metastable glassy metal, which has been hypothesized to induce selective clustering of atoms of different steric hindrance, is discussed. Smaller Be, Cu and Ni atomsmay differently rearrange themselves in the bulk metal glassy super cooled liquids forming flow streams of lower viscosity. Segregation of atoms of different size could activate a variety of viscous flow instabilities such as folding and swirling. FEI Scios Dual-Beam Electron scanning and optical microscopy observations of a commercial liquid metal alloy (Zr44Ti11Cu10Ni10Be25) have been carried out. We discussed the influence of short-range order clusters distribution and its effect in locally induced shear flow instability and corrosion resistance.
Highlights
Bulk Metallic Glasses (BMGs), even called bulk amorphous alloys, are a category of new advanced materials with a disordered atomic-scale structure
The Scanning Electron Microscopy of the surface revealed the presence of surface groove shaped defects that are characteristics of flow instabilities observed in polymeric injection molded parts (Fig. 3)
Our Zr44-Ti11-Cu10-Ni10-Be25BMG, which is formed by different steric hindrance metal atoms, experiences significant temperature gradient and shear flow stresses when injected into a mold
Summary
Bulk Metallic Glasses (BMGs), even called bulk amorphous alloys, are a category of new advanced materials with a disordered atomic-scale structure. Could generate high temperature gradients through the molten metal (Fig. 9) leading to high viscosity changes that increases the possibility of microfluidic flow instability and micro-groove and ripples formation (indicatively reported in Fig. 9) such as that seen in Fig. 3 (right top) and 5.
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