MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Evaluation of Micro-Sized BMG Tensile Specimen Fabricated by Electrolytic Polishing Technique
Mikito KondoRyo MorihashiChiemi IshiyamaMasato SoneYakichi Higo
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2007 Volume 48 Issue 7 Pages 1785-1788

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Abstract

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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© 2007 The Japan Institute of Metals and Materials
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