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Critical Shear Offset of Fracture in a Zr-based Metallic Glass

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Abstract

The nanoscale shear band operation process of Zr55Pd10Cu20Ni5 Al10 metallic glass (MG) was reined in by constant force during well-designed loading-holding-unloading cyclic microcompression test. Through the test, it is revealed that the whole shear banding process involves three stages: shear band initiation, shear sliding and shear band arrest. Based on the energy balance principle, the size-affected speed of shear sliding is interpreted. The energy originated from the shear sliding leads to heat-up of the shear plane; therefore, the temperature in shear band increases with the size of shear offset caused by the energy accumulation during shear sliding. Taking the glass transition temperature as the critical temperature of fracture for the Zr-based MG, the critical shear offset is predicted to be approximately 190 μm, fully in line with the experimental observation. This directly proved that the fracture of the MG is caused by the temperature rise during shear sliding.

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Authors and Affiliations

  1. Shenzhen Key Laboratory of Advanced Manufacturing Technology for Mold & Die, Department of Mechanical and Electronic Engineering, Shenzhen University, 518060, Shenzhen, Guangdong, China

    Zhi-yuan Liu (Doctor, Associate Professor)

  2. Centre for Advanced Structural Materials, Department of Mechanical and Biomedical Engineering, College of CSE, City University of Hong Kong, 999077, Hong Kong, China

    Yong Yang & Chain-tsuan Liu

Authors
  1. Zhi-yuan Liu
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  2. Yong Yang
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  3. Chain-tsuan Liu
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Corresponding author

Correspondence to Zhi-yuan Liu.

Additional information

Foundation Item: Item Sponsored by Natural Science Foundation of Guangdong Province of China (2014A030310189); Shenzhen Senior Talent Research Start-up Funding of China (827000056); General Research Fund from Research Grant Council of Hong Kong Government of China (CityU 102013)

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Liu, Zy., Yang, Y. & Liu, Ct. Critical Shear Offset of Fracture in a Zr-based Metallic Glass. J. Iron Steel Res. Int. 23, 53–56 (2016). https://doi.org/10.1016/S1006-706X(16)30011-5

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  • DOI: https://doi.org/10.1016/S1006-706X(16)30011-5

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