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Study of FeNi-L10 ordering via quasi equilibrium cooling process

Abstract

Two Fe–Ni alloys were prepared using the arc melting method: Fe50Ni50 and Fe64Ni36. The samples after annealing were reheated up to 650°C and cooled at a very slow rate to approach thermodynamic equilibrium. The coarse grains of the as prepared samples have been substantially reduced after thermal process resulting in a larger fraction of grain boundaries and a higher diffusivity. Magnetic hysteresis curves reveal an increased coercivity of the cooling processed samples compared to the annealed samples. These results suggest that during slow rate cooling a partial phase transition of disordered γ-FeNi to ordered L10 is possible to occur.

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Data availability

The datasets generated during the current study are available from the corresponding author on reasonable request.

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Acknowledgments

Professor N. Bouropoulos, University of Patras, Materials Science Dpt., Greece, is acknowledged for XRD measurements.

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Correspondence to V. Karoutsos.

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On behalf of all authors the corresponding author states that there is no conflict of interest directly relevant to the content of this manuscript.

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Karoutsos, V., Pitsakis, J.G., Poulopoulos, P. et al. Study of FeNi-L10 ordering via quasi equilibrium cooling process. MRS Communications (2021). https://doi.org/10.1557/s43579-021-00100-5

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Keywords

  • Phase transformation
  • Magnetic properties
  • Diffusion
  • Grain boundaries
  • Grain size
  • Nanostructure