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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
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: abdeslem.fnidiki@univ-rouen.fr
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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.

Type
Materials Applications
Copyright
Copyright © Microscopy Society of America 2012

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