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Spatial Resolution Limit for Nanoindentation Mapping on Metallic Glasses.

Tao Liang1,2, Qing Yu2, Ziliang Yin2

  • 1Jiangsu Key Laboratory of Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, China.

Materials (Basel, Switzerland)
|September 23, 2022
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Summary

Understanding spatial heterogeneity in metallic glasses (MGs) is key. This study reveals nanoindentation mapping achieves ~200 nm resolution at d/h=10, optimizing heterogeneity studies.

Keywords:
heterogeneitymetallic glassnanoindentationspatial resolution limit

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Mechanical Engineering

Background:

  • Spatial heterogeneity is a critical feature in metallic glasses (MGs).
  • Nanoindentation mapping is a primary technique for studying this heterogeneity.
  • The spatial resolution limits of nanoindentation mapping on MGs have not been fully explored.

Purpose of the Study:

  • To investigate the influence of normalized indentation spacing (d/h) on the spatial resolution of nanoindentation mapping in metallic glasses.
  • To determine the optimal d/h ratio for achieving reliable and consistent measurements of hardness and elastic modulus.
  • To elucidate the underlying mechanisms affecting measured properties at different indentation spacings.

Main Methods:

  • Nanoindentation mapping was performed on four representative metallic glasses using a Berkovich indenter.
  • The normalized indentation spacing (d/h) was systematically varied.
  • Residual indent morphology was analyzed using scanning electron microscopy (SEM) and atomic force microscopy (AFM).

Main Results:

  • Hardness and elastic modulus showed no significant correlation with d/h when d/h > 10.
  • A slight increase (~5%) in hardness and modulus was observed for d/h < 10.
  • A notable decrease in measured properties occurred when d/h < 5, attributed to overlapping plastic zones.
  • The highest spatial resolution of approximately 200 nm was achieved at d/h = 10.

Conclusions:

  • The normalized indentation spacing (d/h) significantly impacts the spatial resolution and measured mechanical properties in nanoindentation mapping of metallic glasses.
  • An optimal d/h ratio of approximately 10 is recommended for reliable heterogeneity studies, achieving a resolution of ~200 nm.
  • These findings provide crucial guidance for optimizing nanoindentation techniques to accurately characterize the heterogeneity of metallic glasses across various length scales.