Evaluation of Micro-Sized BMG Tensile Specimen Fabricated by Electrolytic Polishing Technique

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  • Kondo Mikito
    Depertment of Materials Science and Engineering, Tokyo Institute of Technology
  • Morihashi Ryo
    Depertment of Materials Science and Engineering, Tokyo Institute of Technology
  • Ishiyama Chiemi
    Precision & Intelligence Laboratory, Tokyo Institute of Technology
  • Sone Masato
    Precision & Intelligence Laboratory, Tokyo Institute of Technology
  • Higo Yakichi
    Precision & Intelligence Laboratory, Tokyo Institute of Technology

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An electrolytic polishing technique was used to fabricate micro-sized tensile specimens from two Zr55Al10Ni5Cu30 bulk metallic glass samples. One sample had a fully amorphous phase, while the other had dendrites with an average size of 33 μm within the amorphous matrix. A scanning electron microscope showed that specimens fabricated by electrolytic polishing had smooth surfaces. The specimens were then subjected to tensile tests at room temperature. The fully amorphous specimen had a fracture strength of 1,640 MPa. This specimen also showed slight plastic deformation after yielding, as well as vein patterns and smooth surface on the fracture surface. Multiple thin shear bands generated from a shear band were observed on the side surface of fractured specimen. The specimen containing dendrites was quite low in strength compared to the fully amorphous specimen, and had yield and fracture strengths of 460 and 600 MPa, respectively. The specimen containing dendrites also showed plastic deformation and work hardening after yielding, as well as vein patterns and a brittle fracture region on the fracture surface.

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