Research Article Open Access

Processability of Bulk Metallic Glasses

Raffaella Aversa1, Daniela Parcesepe1, Relly Victoria V. Petrescu2, Guanying Chen3, Florian Ion T. Petrescu4, Francesco Tamburrino1 and Antonio Apicella1
  • 1 Second University of Naples, Italy
  • 2 Bucharest Polytechnic University, Romania
  • 3 Harbin Institute of Technology and SUNY Buffalo, China
  • 4 Bucharest Polytechnic University, Romania
American Journal of Applied Sciences
Volume 14 No. 2, 2017, 294-301

DOI: https://doi.org/10.3844/ajassp.2017.294.301

Submitted On: 3 January 2017 Published On: 15 February 2017

How to Cite: Aversa, R., Parcesepe, D., Petrescu, R. V. V., Chen, G., Petrescu, F. I. T., Tamburrino, F. & Apicella, A. (2017). Processability of Bulk Metallic Glasses. American Journal of Applied Sciences, 14(2), 294-301. https://doi.org/10.3844/ajassp.2017.294.301

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.

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Keywords

  • Bulk Glass Metals
  • Rheology
  • Shear Flow
  • Segregation
  • Microfluidic Instability