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It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
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Magnetic Binary Supersaturated Solid Solutions Processed by Severe Plastic Deformation.

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Summary

High-pressure torsion processing of immiscible ferromagnetic-diamagnetic alloys (Co-Cu, Fe-Cu, Fe-Ag) reveals microstructural saturation. Magnetic properties correlate with composition, showing distinct behaviors for each alloy system.

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high-pressure torsionmagnetic propertiesnanocrystallinesevere plastic deformationsupersaturation

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Metallurgy

Background:

  • Ternary alloys of ferromagnetic and diamagnetic elements (Co-Cu, Fe-Cu, Fe-Ag) are immiscible at equilibrium.
  • High-pressure torsion (HPT) is a severe plastic deformation technique capable of altering alloy microstructures.

Purpose of the Study:

  • To investigate the microstructural evolution and magnetic properties of immiscible Co-Cu, Fe-Cu, and Fe-Ag alloys processed by HPT.
  • To correlate microstructural observations with magnetic measurement data.

Main Methods:

  • High-pressure torsion (HPT) processing of Co-Cu, Fe-Cu, and Fe-Ag samples at various compositions.
  • Microstructural analysis using electron microscopy and synchrotron X-ray diffraction.
  • Magnetic property measurements using magnetometry.

Main Results:

  • Microstructural saturation was observed in all processed samples.
  • Co-Cu samples exhibited primarily ferromagnetic behavior with decreasing coercivity as Co content increased.
  • Fe-Cu samples showed a dual-phase microstructure and magnetic behavior consistent with two distinct magnetic phases.
  • Fe-Ag samples indicated no significant intermixing between elemental phases.

Conclusions:

  • HPT processing leads to microstructural saturation in immiscible ferromagnetic-diamagnetic alloys.
  • The magnetic properties are strongly dependent on the alloy system and composition, reflecting the underlying microstructure.
  • Fe-Cu alloys present a promising system for further investigation due to their dual-phase nature.