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  4. Amorphous nickel nanophases inducing ferromagnetism in equiatomic Ni-Ti alloy
 
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2018
Journal Article
Title

Amorphous nickel nanophases inducing ferromagnetism in equiatomic Ni-Ti alloy

Abstract
Ni50Ti50 nm-sized amorphous particles are prepared using inert-gas condensation followed by in situ compaction. Elemental segregation of Ni and Ti is observed in the consolidated nanostructured material. Amorphous, nearly pure Nickel (96%) nanophases form within the amorphous Ni50Ti50 alloy. Combining atom probe tomography and scanning transmission electron microscopy with computer modelling, we explore the formation process of such amorphous nanophase structure. It is shown that the Ni rich amorphous phase in the consolidated nanostructured material is responsible for the ferromagnetic behavior of the sample whereas the rapidly quenched amorphous and crystalline samples with the same chemical composition (Ni50Ti50) were found to be paramagnetic. Due to the high cooling rate obtained using the inert gas condensation technique, an exceptional control over the crystallization processes is possible, promoting the formation of various amorphous phases, which are not obtained by standard rapid quenching techniques. Our findings demonstrate the potential of amorphous metallic nanostructures as advanced technological materials, and useful magnetic compounds.
Author(s)
Chellali, M.R.
Karlsruhe Institute of Technology KIT, Institute of Nanotechnology
Nandam, S.H.
Karlsruhe Institute of Technology KIT, Institute of Nanotechnology
Li, S.
Karlsruhe Institute of Technology KIT, Institute of Nanotechnology
Fawey, M.H.
Karlsruhe Institute of Technology KIT, Institute of Nanotechnology
Moreno-Pineda, E.
Karlsruhe Institute of Technology KIT, Institute of Nanotechnology
Velasco, L.
Karlsruhe Institute of Technology KIT, Institute of Nanotechnology
Boll, T.
Karlsruhe Institute of Technology KIT
Pastewka, L.
Fraunhofer-Institut für Werkstoffmechanik IWM  
Kruk, R.
Karlsruhe Institute of Technology KIT, Institute of Nanotechnology
Gumbsch, P.
Fraunhofer-Institut für Werkstoffmechanik IWM  
Hahn, H.
Karlsruhe Institute of Technology KIT, Institute of Nanotechnology; KIT-TUD Joint Research Laboratory Nanomaterials, Institute of Materials Science, Technical University Darmstadt; Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology
Journal
Acta Materialia  
Funder
Deutsche Forschungsgemeinschaft DFG  
Deutsche Forschungsgemeinschaft DFG  
DOI
10.1016/j.actamat.2018.09.019
Language
English
Fraunhofer-Institut für Werkstoffmechanik IWM  
Keyword(s)
  • amorphous nickel

  • molecular dynamic

  • magnetic

  • atom probe tomography

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