Effect of sample size on ductility of metallic glass |
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| Authors: | F.F. Wu S.X. Mao J. Eckert |
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| Affiliation: | 1. Shenyang National Laboratory for Materials Science, Institute of Metal Research,Chinese Academy of Sciences , 72 Wenhua Road, Shenyang 110016, China;2. School of Materials and Chemical Engineering, Liaoning University of Technology , 169 Shiying Street, Jinzhou 121001, China ffwoo@foxmail.com;4. Department of Mechanical Engineering and Materials Science , University of Pittsburgh , 648 Benedum Hall, Pittsburgh, PA 15261, USA;5. IFW Dresden, Institute for Complex Materials , P.O. Box 270116, D-01171 , Dresden, Germany;6. Institute of Materials Science, TU Dresden , D-01062, Dresden, Germany |
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| Abstract: | With decreasing sample dimension, the compressive plastic strain of a Zr-based metallic glass increases from near zero to as high as 80% without failure. This indicates that macroscopically brittle or ductile deformation behaviour can occur in chemically and structurally identical metallic glass. A concept of critical shear offset is proposed to explain the strong size effect on the enhanced plasticity of metallic glass by taking the shear fracture energy density into account. This finding provides new understanding on the principle that for metallic glass ‘smaller is more ductile’, even on the macroscopic scale. |
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| Keywords: | metallic glass sample size ductility deformation |
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