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Nanoindentation of embedded particles.

Alejandra Slagter1, Joris Everaerts1,2, Andreas Mortensen1

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Summary

This study quantifies how elastic differences between particles and their matrix affect indentation measurements. An adapted Oliver-Pharr method accurately determines particle properties, even with significant elastic inhomogeneity.

Keywords:
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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Nanotechnology

Background:

  • Accurate determination of material properties like elastic modulus and hardness is crucial for composite materials.
  • Depth-sensing indentation techniques are widely used but can be affected by elastic inhomogeneity.
  • Understanding the influence of particle-matrix elastic mismatch is essential for reliable characterization.

Purpose of the Study:

  • To investigate the impact of elastic inhomogeneity on elastic modulus and hardness measurements of embedded particles.
  • To develop and validate an adapted Oliver-Pharr method for accurate property determination of individual particles within a matrix.

Main Methods:

  • Utilizing finite element simulations to model indentation behavior.
  • Conducting nanoindentation experiments on particle-matrix systems.
  • Proposing and implementing an adaptation of the Oliver-Pharr method.

Main Results:

  • Quantified the effects of particle/matrix elastic inhomogeneity on indentation outcomes.
  • Demonstrated the effectiveness of the adapted Oliver-Pharr method across various elastic modulus combinations.
  • Established conditions for successful implementation, including avoiding permanent deformation in the matrix and particle.

Conclusions:

  • The adapted Oliver-Pharr method provides accurate particle properties despite elastic inhomogeneity.
  • The method is versatile, applicable to diverse material combinations and indenter types.
  • Careful control of testing conditions is necessary for reliable results.