Crack evolution in bulk metallic glasses

Simon Pauly, Min Ha Lee, Do Hyang Kim, Ki Buem Kim, Daniel J. Sordelet, Jürgen Eckert

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19 Citations (Scopus)

Abstract

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 nanometer-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.

Original languageEnglish
Article number103518
JournalJournal of Applied Physics
Volume106
Issue number10
DOIs
Publication statusPublished - 2009

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Pauly, S., Lee, M. H., Kim, D. H., Kim, K. B., Sordelet, D. J., & Eckert, J. (2009). Crack evolution in bulk metallic glasses. Journal of Applied Physics, 106(10), [103518]. https://doi.org/10.1063/1.3259418