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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

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Accelerating Nature: Induced Atomic Order in Equiatomic FeNi.

Laura H Lewis¹, Plamen S Stamenov²

¹Department of Chemical Engineering and Department of Mechanical and Industrial Engineering, Northeastern University, Boston, MA, 02115, USA.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|December 10, 2023

Summary

This summary is machine-generated.

Researchers produced atomically ordered iron-nickel (FeNi), or tetrataenite, in bulk samples. Further processing could enhance its properties for advanced permanent magnets, crucial for green energy solutions.

Keywords:

Mössbauer spectroscopy chemical order meteorites permanent magnets phase transitions

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Area of Science:

Materials Science
Solid State Physics
Mineralogy

Background:

Atomically ordered FeNi, known as tetrataenite, is a naturally occurring mineral found in meteorites.
Understanding its formation and properties is key to developing advanced magnetic materials.

Purpose of the Study:

To confirm the production of atomically ordered FeNi (tetrataenite) in bulk samples.
To quantify the amount of tetrataenite formed under specific processing conditions.
To compare the atomic order of processed FeNi with natural tetrataenite.

Main Methods:

Simultaneous conversion X-ray and backscattered γ-ray ⁵⁷ Fe Mössbauer spectroscopy.
Thermal treatment of FeNi alloys under simultaneous magnetic and stress fields for 6 weeks.
Analysis of precursor and processed alloy samples.

Main Results:

Up to 22% tetragonal tetrataenite was quantified in processed FeNi samples; the remainder was cubic FeNi alloy.
Processed FeNi showed a lower degree of atomic order compared to meteoritic tetrataenite.
Meteoritic tetrataenite exhibited low uniaxial magnetocrystalline anisotropy energy (≈1 kJ·m^-3).

Conclusions:

Targeted refinements in FeNi processing can enhance atomic order and magnetocrystalline anisotropy.
Improved FeNi could lead to enhanced magnetic energy products for permanent magnets.
Tetrataenite shows potential for advanced permanent magnet applications, supporting green energy initiatives.