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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Local microstructure evolution at shear bands in metallic glasses with nanoscale phase separation.

Jie He1,2, Ivan Kaban2,3, Norbert Mattern2

  • 1Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China.

Scientific Reports
|May 17, 2016
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Summary

Plastic deformation in metallic glasses (MGs) involves shear bands. This study reveals nanospheres within shear bands dissolve, while nearby ones coarsen, indicating an affected zone around shear bands with increased atomic mobility.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Plastic flow in metallic glasses (MGs) localizes in shear bands.
  • Shear band formation, evolution, and multiplication mechanisms remain debated.
  • Understanding these phenomena is crucial for designing MGs with enhanced plasticity.

Purpose of the Study:

  • Investigate local conditions at shear bands in phase-separated bulk MGs.
  • Examine the behavior of glassy nanospheres within and around shear bands.
  • Clarify the role of affected zones in the matrix on material properties.

Main Methods:

  • Compression testing of phase-separated bulk metallic glasses.
  • Microstructural analysis of shear bands and surrounding matrix.
  • Observation of nanosphere dissolution and Ostwald ripening.

Main Results:

  • Glassy nanospheres within shear bands dissolve via mechanical mixing.
  • Nanospheres in the matrix coarsen through Ostwald ripening due to increased atomic mobility.
  • An affected zone with low-strain plastic deformation is identified around shear bands.

Conclusions:

  • Deformation-induced atomic mobility changes around shear bands influence material properties.
  • Both shear bands and adjacent affected zones contribute to property changes in MGs.
  • Direct visualization of deformation effects, including atomic mobility, around shear bands is achieved.