COMBINED MÖSSBAUER SPECTROMETRY AND ATOM PROBE TOMOGRAPHY INVESTIGATION OF MECHANICALLY MILLED RARE EARTH / TRANSITION METAL POWDERS

Authors

  • Jean-Marie LE BRETON Normandie University, UNIROUEN, INSA Rouen, CNRS, Groupe de Physique des Matériaux, 76000 Rouen, France. * Corresponding author: jean-marie.lebreton@univ-rouen.fr
  • Rodrigue LARDE Institut Néel, CNRS, Grenoble INP, Université Grenoble Alpes, 25 Avenue des Martyrs, 38000 Grenoble, France
  • Amjaad ABOU LATIF Normandie University, UNIROUEN, INSA Rouen, CNRS, Groupe de Physique des Matériaux, 76000 Rouen, France
  • Nicolas MAAT MAAT Normandie University, UNIROUEN, INSA Rouen, CNRS, Groupe de Physique des Matériaux, 76000 Rouen, France
  • Virginie NACHBAUR Normandie University, UNIROUEN, INSA Rouen, CNRS, Groupe de Physique des Matériaux, 76000 Rouen, France
  • Olivier ISNARD Institut Néel, CNRS, Grenoble INP, Université Grenoble Alpes, 25 Avenue des Martyrs, 38000 Grenoble, France https://orcid.org/0000-0002-7930-4378
  • Dominique GIVORD Institut Néel, CNRS, Grenoble INP, Université Grenoble Alpes, 25 Avenue des Martyrs, 38000 Grenoble, France
  • Ionel CHICINAȘ Materials Science and Engineering Department, Technical University of Cluj-Napoca, 103-105 Muncii Ave., 400641 Cluj-Napoca, Romania https://orcid.org/0000-0002-6371-0689
  • Viorel POP Faculty of Physics, Babes-Bolyai University Cluj-Napoca, Kogalniceanu str 1, 400084 Cluj-Napoca, Romania https://orcid.org/0000-0001-5125-4412

DOI:

https://doi.org/10.24193/subbphys.2021.06

Keywords:

rare earths-transition metals powders, Mössbauer spectrometry, atom probe tomography.

Abstract

The microstructure of mechanically milled Nd2Fe14B, SmCo5/Fe and SmCo3Cu2/α-Fe alloys has been investigated by Mössbauer spectrometry and atom probe tomography. The structural changes that occur upon milling and subsequent annealing were characterised at a nanometer scale. Milling promotes intermixing of the elements and the formation of nanograins. In Nd-Fe-B powders, the Nd2Fe14B phase is transformed into α-Fe and an amorphous Nd-Fe-B phase. In SmCo5/Fe powders, Fe/Co intermixing occurs, leading to the formation of Sm(Co,Fe)5 and α-Fe(Co) phases. In SmCo3Cu2/Fe powders, although Sm is partly oxidised, Fe/Co intermixing occurs as well, leading to the formation of α-Fe(Co) nanograins surrounded by Sm(Co,Cu,Fe)5 intergranular regions. The combined Mössbauer and atom probe tomography investigation of rare earth / transition metal powders thus allows revealing the effect of mechanical milling and subsequent annealing on the nanostructure of the powders. These results are helpful for the understanding of the magnetic properties of the powders.

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STUDIA UBB PHYSICA, Volume 66 (LXVI), No. 1-2, December 2021

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Published

2021-12-30

How to Cite

LE BRETON, . J.-M., LARDE, R., ABOU LATIF, A., MAAT, N. M., NACHBAUR, V., ISNARD, O., GIVORD, D., CHICINAȘ, I., & POP, V. (2021). COMBINED MÖSSBAUER SPECTROMETRY AND ATOM PROBE TOMOGRAPHY INVESTIGATION OF MECHANICALLY MILLED RARE EARTH / TRANSITION METAL POWDERS. Studia Universitatis Babeș-Bolyai Physica, 66(1-2), 55–68. https://doi.org/10.24193/subbphys.2021.06

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Volume 66, No. 1-2, 2021

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