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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Nanotechnology

Background:

  • Nanoindentation is standard for measuring elastic modulus and yield strength at small scales.
  • Measuring strain hardening, crucial for ductility and toughness, is challenging with conventional nanoindentation.
  • Load-displacement data alone lacks uniqueness for determining plastic properties like stress-strain behavior.

Purpose of the Study:

  • To develop and apply a novel method for accurately measuring strain hardening using nanoindentation.
  • To overcome the limitations of traditional nanoindentation in characterizing plastic material properties.
  • To investigate the plastic properties of nano-structured oxide dispersion strengthened steel for nuclear applications.

Main Methods:

  • Utilized X-ray nano-tomography to capture 3D images of the indentation zone.
  • Applied digital volume correlation (DVC) to the tomographs to map the sub-surface displacement field.
  • Combined nanoindentation with DVC to derive plastic material properties, including strain hardening.

Main Results:

  • Successfully measured the sub-surface displacement field beneath a nanoindentation.
  • Obtained plastic properties, specifically strain hardening, which are difficult to determine with standard nanoindentation.
  • Characterized the mechanical behavior of a nano-structured oxide dispersion strengthened steel.

Conclusions:

  • 3D displacement field mapping via DVC of X-ray nano-tomographs provides a unique solution for material plastic properties.
  • This novel method enables accurate characterization of strain hardening, a critical but hard-to-measure property.
  • The technique is suitable for evaluating materials like advanced steels for nuclear energy, potentially simulating neutron damage effects.