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Related Concept Videos

Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

202
Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
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Raman Spectroscopy: Overview01:20

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
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Measurements of Strain01:27

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Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
371

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Two-dimensional strain-mapping by electron backscatter diffraction and confocal Raman spectroscopy.

Andrew J Gayle1, Lawrence H Friedman1, Ryan Beams1

  • 1Materials Measurement Science Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.

Journal of Applied Physics
|January 20, 2025
PubMed
Summary
This summary is machine-generated.

Researchers mapped strain fields in silicon using electron backscatter diffraction (EBSD) and Raman spectroscopy. These techniques accurately assess multiaxial strain states, enhancing microelectromechanical systems (MEMS) reliability.

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Area of Science:

  • Materials Science
  • Solid Mechanics
  • Nanotechnology

Background:

  • Spherical indentation in silicon creates complex residual strain fields.
  • Accurate mapping of these strain fields is crucial for understanding material behavior and device reliability.
  • Existing techniques may have limitations in characterizing multiaxial strain states.

Purpose of the Study:

  • To map the two-dimensional (2-D) strain field surrounding a spherical indentation in silicon.
  • To assess and compare the accuracy of electron backscatter diffraction (EBSD) cross-correlation and confocal Raman spectroscopy for strain mapping.
  • To evaluate the potential of these techniques for enhancing the reliability of microelectromechanical systems (MEMS).

Main Methods:

  • Two-dimensional (2-D) strain mapping using electron backscatter diffraction (EBSD) cross-correlation.
  • Confocal Raman spectroscopy for mapping residual stress.
  • Spherical indentation with a 200 mN load on a silicon (001) surface.
  • Generation of 50 µm × 50 µm maps with 128 pixels × 128 pixels resolution.

Main Results:

  • EBSD revealed a residual strain field with in-surface normal and shear strains, exhibiting two-fold symmetry.
  • Raman spectroscopy showed a residual Raman shift field with positive shifts and four-fold symmetry.
  • Both strain fields extended approximately three to four indentation diameters from the contact.
  • EBSD results, combined with mechanical-spectroscopic analysis, successfully predicted the Raman shift map characteristics.

Conclusions:

  • Electron backscatter diffraction (EBSD) and confocal Raman spectroscopy are effective techniques for mapping 2-D strain fields in silicon.
  • The study demonstrates the capability of these methods to characterize multiaxial strain states.
  • These techniques can enhance the reliability of microelectromechanical systems (MEMS) by identifying critical strain fields.