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Correlation between microstructure, magnetic properties and mechanical behavior of the Permimphy alloy after high-pressure torsion

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Abstract

This study investigates the correlation between coercivity (Hc), grain size (d), and dislocation density in the Permimphy alloy (Fe–80%Ni–6%Mo). The samples used in this study were subjected to varying levels of applied strain through processing by high-pressure torsion. The microstructure and the magnetic coercivity were analyzed using a scanning electron microscope, electron backscatter diffraction and vibrating sample magnetometry. The grain size of the samples varied from 30 to 190 nm. This study demonstrated a strong correlation between Hc and microhardness when d > 3 µm. The results show that the coercivity of the Permimphy alloy follows an inverse V-shape with respect to grain size. The coercivity of the samples decreased despite increasing the dislocation density and the hardness when d < 3 µm. This phenomenon is attributed to the ferromagnetic exchange interaction across multiple grains and leads to the alignment of magnetic moments.

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Some data included in this work are available upon request by contact with the corresponding author.

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Acknowledgements

Two of the authors were supported by the European Research Council under Grant Agreement No. 267464-SPDMETALS (YH and TGL).

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Authors and Affiliations

  1. CNRS, Institut de Chimie Moléculaire et des Matériaux d’Orsay, Université Paris-Saclay, 91405, Orsay, France

    Oussama Dabou, Thierry Baudin, François Brisset & Anne-Laure Helbert

  2. Laboratoire Physique des Matériaux, Faculté de Physique, Université des Sciences et de la Technologie Houari Boumediene, Bab Ezzouar, El Alia, BP32, Alger, Algeria

    Oussama Dabou & Djamel Bradai

  3. Research Center, Aperam Alloys, Rue P. Chevenard, 58160, Imphy, France

    Thierry Waeckerlé & Yanick Ateba Betanda

  4. Department of Design and Engineering, Faculty of Science and Technology, Bournemouth University, Poole, Dorset, BH12 5BB, UK

    Yi Huang

  5. Materials Research Group, Department of Mechanical Engineering, University of Southampton, Southampton, SO17 1BJ, UK

    Yi Huang & Terence G. Langdon

Authors
  1. Oussama Dabou
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  2. Thierry Baudin
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  6. Yi Huang
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  7. Anne-Laure Helbert
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  8. Djamel Bradai
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  9. Terence G. Langdon
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Contributions

Oussama Dabou (M.Sc.) contributed to investigation, validation, writing, and visualization. Thierry Baudin (Dr.) contributed to methodology, review and editing, visualization. François Brisset (Dr.) contributed to methodology and investigation. Thierry Waeckerlé (Dr.) and Yanick Ateba Betanda (Dr.) contributed to methodology and review. Yi Huang (Prof.) contributed to methodology, review and editing. Djamel Bradai (Prof.) and Anne-Laure Helbert (Prof.) contributed to conceptualization, writing, original draft, review and editing, visualization and supervision. Terence G. Langdon (Prof.) contributed to review and editing.

Corresponding author

Correspondence to Oussama Dabou.

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Dabou, O., Baudin, T., Brisset, F. et al. Correlation between microstructure, magnetic properties and mechanical behavior of the Permimphy alloy after high-pressure torsion. J Mater Sci 59, 5968–5980 (2024). https://doi.org/10.1007/s10853-024-09490-y

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