Synthesis of nanocrystalline Supermalloy powders by mechanical alloying: A thermomagnetic analysis

Nanocrystalline Supermalloy powders (79Ni19Fe5Mo, wt%) were obtained by mechanical alloying under argon atmosphere and subsequent annealing. Several milling times ranging from 2 to 32 h have been used. The alloy formation was checked by X-ray diffraction and magnetic measurements. The Curie temperat...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2010-05, Vol.322 (9), p.1548-1551
Main Authors: Popa, Florin, Isnard, Olivier, Chicinaş, Ionel, Pop, Viorel
Format: Article
Language:English
Subjects:
Annealing
Condensed Matter
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cooling
Cross-disciplinary physics: materials science
rheology
Curie temperature
Diffraction
Exact sciences and technology
Ferromagnetism
Heating
Magnetic properties and materials
Magnetic properties of nanostructures
Materials Science
Mechanical alloying
Nanocristalline Supermalloy powder
Nanocrystalline materials
Nanocrystals
Nanoscale materials and structures: fabrication and characterization
Physics
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Summary:Nanocrystalline Supermalloy powders (79Ni19Fe5Mo, wt%) were obtained by mechanical alloying under argon atmosphere and subsequent annealing. Several milling times ranging from 2 to 32 h have been used. The alloy formation was checked by X-ray diffraction and magnetic measurements. The Curie temperature measurements illustrate the progressive formation of the alloy until 16 h of milling. The evolution of the ferromagnetic–paramagnetic transition and the formation of the alloy in the milled samples are discussed considering the heating and cooling part of the thermomagnetic measurements. A difference between the Curie temperatures measured on the heating and cooling curves was observed. This difference has been interpreted as resulting from a powder contamination with iron for longer milling times.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2009.06.006