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Atom Probe Tomography Analysis of Exsolved Mineral Phases
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Quantifying short-range order using atom probe tomography.

Mengwei He1, William J Davids1, Andrew J Breen1

  • 1Australian Centre for Microscopy and Microanalysis, and School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, New South Wales, Australia.

Nature Materials
|July 2, 2024
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Summary
This summary is machine-generated.

Researchers developed a new atom probe tomography method to measure short-range order (SRO) in medium- and high-entropy alloys. This technique quantifies SRO changes during heat treatment, aiding alloy design.

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Area of Science:

  • Materials Science
  • Metallurgy
  • Computational Materials Science

Background:

  • Medium- and high-entropy alloys offer exceptional strength and ductility.
  • Short-range order (SRO) is predicted computationally but challenging to measure experimentally.
  • Quantifying SRO is crucial for understanding its impact on alloy properties.

Purpose of the Study:

  • To develop a robust method for measuring SRO in alloys using atom probe tomography.
  • To investigate the influence of heat treatment on SRO in CoCrNi alloys.
  • To enable accurate computational modeling of SRO effects.

Main Methods:

  • Utilized atom probe tomography (APT) to quantify species-specific SRO.
  • Developed an approach to balance APT limitations with SRO threshold values.
  • Applied the method to a CoCrNi alloy subjected to various heat treatments.

Main Results:

  • Successfully measured SRO changes induced by heat treatments in CoCrNi.
  • Established regimes where atomistic neighborhood information is preserved in APT.
  • Generated experimental SRO data for validating computational models.

Conclusions:

  • The developed APT approach provides a reliable way to measure SRO.
  • Accurate SRO quantification advances the understanding of alloy behavior.
  • This method facilitates the design of advanced medium- and high-entropy alloys.