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This study introduces a novel image correlation method for dynamic in-situ microtensile testing of high entropy alloys. The technique enhances data acquisition, enabling detailed analysis of plastic deformation and material properties.

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digital image correlationhigh-entropy alloyin situmicro-tensile testingscanning electron microscopy (SEM)

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Nanotechnology

Background:

  • Micromechanical testing offers unique insights into material properties but faces challenges in precise control and data analysis compared to macroscopic tests.
  • Extracting comprehensive information from miniaturized experiments is crucial for advancing materials research.
  • High entropy alloys (HEAs) present complex behaviors under mechanical stress, necessitating advanced characterization techniques.

Purpose of the Study:

  • To develop and validate an advanced image correlation method for dynamic in-situ microtensile testing.
  • To enable precise measurement of 2D strain fields in nanocrystalline equiatomic CoCrFeMnNi high entropy alloys.
  • To enhance the understanding of plastic deformation localization and material behavior in microscale testing.

Main Methods:

  • Dynamic in-situ microtensile testing was performed on a nanocrystalline equiatomic CoCrFeMnNi high entropy alloy.
  • Initial feature tracking and a novel image correlation method were employed to capture continuous two-dimensional strain fields.
  • The methodology allowed for the evaluation of true stress-strain data and Poisson's ratio.

Main Results:

  • A continuous two-dimensional strain field was successfully obtained, providing detailed insights into material deformation.
  • The method enabled accurate evaluation of true stress-strain behavior and Poisson's ratio for the alloy.
  • Localization of plastic deformation was effectively studied, revealing complex strain field characteristics.

Conclusions:

  • The presented image correlation method significantly enhances information gain from sophisticated microtensile experiments compared to commercial tools.
  • This technique provides a robust foundation for studying intricate deformation states in advanced materials.
  • The findings pave the way for more detailed characterization of materials under microscale mechanical stress.