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Nanometer Scale Tomographic Investigation of Fine Scale Precipitates in a CuFeNi Granular System by Three-Dimensional Field Ion Microscopy

Published online by Cambridge University Press:  02 October 2012

Sophie Cazottes ,
François Vurpillot ,
Abdeslem Fnidiki ,
Dany Lemarchand ,
Marcello Baricco  and
Frederic Danoix
Sophie Cazottes
Affiliation:
Groupe de Physique des Matériaux, Université de Rouen, UMR CNRS 6634, Site Universitaire du Madrillet,BP12, 76801 Saint Etienne du Rouvray cedex, France
François Vurpillot
Affiliation:
Groupe de Physique des Matériaux, Université de Rouen, UMR CNRS 6634, Site Universitaire du Madrillet,BP12, 76801 Saint Etienne du Rouvray cedex, France
Abdeslem Fnidiki*
Affiliation:
Groupe de Physique des Matériaux, Université de Rouen, UMR CNRS 6634, Site Universitaire du Madrillet,BP12, 76801 Saint Etienne du Rouvray cedex, France
Dany Lemarchand
Affiliation:
Groupe de Physique des Matériaux, Université de Rouen, UMR CNRS 6634, Site Universitaire du Madrillet,BP12, 76801 Saint Etienne du Rouvray cedex, France
Marcello Baricco
Affiliation:
Dipartimento di Chimica IFM and NIS/INSTM, Università di Torino, Via P.Giuria 9, 10125 Torino, Italy
Frederic Danoix
Affiliation:
Groupe de Physique des Matériaux, Université de Rouen, UMR CNRS 6634, Site Universitaire du Madrillet,BP12, 76801 Saint Etienne du Rouvray cedex, France
*
*Corresponding author. E-mail: [email protected]
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Abstract

The microstructure of Cu80Fe10Ni10 (at. %) granular ribbons was investigated by means of three-dimensional field ion microscopy (3D FIM). This ribbon is composed of magnetic precipitates embedded in a nonmagnetic matrix. The magnetic precipitates have a diameter smaller than 5 nm in the as-spun state and are coherent with the matrix. No accurate characterization of such a microstructure has been performed so far. A tomographic characterization of the microstructure of melt spun and annealed Cu80Fe10Ni10 ribbon was achieved with 3D FIM at the atomic scale. A precise determination of the size distribution, number density, and distance between the precipitates was carried out. The mean diameter for the precipitates is 4 nm in the as-spun state. After 2 h at 350°C, there is an increase of the size of the precipitates, while after 2 h at 400°C the mean diameter of the precipitates decreases. Those data were used as inputs in models that describe the magnetic and magnetoresistive properties of this alloy.

Keywords

3D field ion microscopygranular materialsstructural characterizationCuFeNi
Type
Materials Applications
Information
Microscopy and Microanalysis , Volume 18 , Issue 5 , October 2012 , pp. 1129 - 1134
Copyright
Copyright © Microscopy Society of America 2012

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