Journal
JOURNAL OF APPLIED PHYSICS
Volume 106, Issue 10, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3259418
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Funding
- Ministry of Knowledge Economy, Republic of Korea
- U.S. Department of Energy, Office of Science, Basic Energy [W-31-109-ENG-38]
- Korea Ministry of Science and Technology
- U.S. Department of Energy, Basic Energy Sciences, through Iowa State University [W-7405-ENG-82]
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In the present study, the mechanisms underlying plastic deformation of a Ni-based bulk metallic glass (BMG) are explored. Based on the microstructural investigations, a model is proposed how fracture emerges in BMGs. After deformation, the glass is macroscopically more fragile indicating a decrease in the viscosity within the shear bands due to shear softening. These fluctuations of viscosity and therefore Poisson ratio between the deformed and undeformed regions appear to be the initiation sites for nano meter-scale cracks, which are aligned parallel to the applied force. Coalescence of voids is believed to form these small cracks, which eventually interconnect along the interface between the sheared and unsheared regions to form a detrimental defect resulting in fracture. (C) 2009 American Institute of Physics. [doi:10.1063/1.3259418]
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