Micromechanisms of serrated flow in a Ni50Pd30P20 bulk metallic glass with a large compression plasticity

K. Wang, T. Fujita, Y. Q. Zeng, N. Nishiyama, A. Inoue, M. W. Chen

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Abstract

Serrated flow is a characteristic feature of plastic deformation of bulk metallic glasses (BMGs) with a large compression strain. However, the underlying mechanisms of the discrete plasticity in the disordered solids have been debated for many years. Here, we report mechanical behavior and microstructural evolution of a Ni50Pd30P20 BMG subjected to uniaxial compression testing. Extensive nanocrystallization within shear bands and in the vicinity of fracture surfaces was observed and various crystal defects, including dislocations, twins and kink bands, were detected in the resultant nanocrystals. These observations suggest a microscopic mechanism of the serrated flow of the BMG, i.e. the stress drop is caused by local strain-softening and the arrest of shear bands is associated with in situ nanocrystallization.

Original languageEnglish (US)
Pages (from-to)2834-2842
Number of pages9
JournalActa Materialia
Volume56
Issue number12
DOIs
StatePublished - Jul 2008

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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