The effect of structural changes during sintering on the electric and magnetic traits of the Ni96.7Mo3.3 alloy nanostructured powder | Zendy

L. Ribić-Zelenović | Zendy; M. Spasojević | Zendy; A. Maričić | Zendy; Mira Ristić | Zendy

Open Access

The effect of structural changes during sintering on the electric and magnetic traits of the Ni96.7Mo3.3 alloy nanostructured powder

Author(s) -

L. Ribić-Zelenović,

M. Spasojević,

A. Maričić,

Mira Ristić

Publication year - 2009

Publication title -

science of sintering

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.309

H-Index - 25

eISSN - 1820-7413

pISSN - 0350-820X

DOI - 10.2298/sos0902175r

Subject(s) - materials science , nanocrystalline material , differential scanning calorimetry , amorphous solid , alloy , electrical resistivity and conductivity , crystallization , powder diffraction , sintering , atmospheric temperature range , amorphous metal , crystallite , composite material , analytical chemistry (journal) , crystallography , metallurgy , chemical engineering , thermodynamics , nanotechnology , chemistry , physics , engineering , electrical engineering , chromatography

Ni96.7Mo3.3 powder was electrochemically obtained. An X-ray diffraction analysis determined that the powder consisted of a 20% amorphous and 80% crystalline phase. The crystalline phase consisted of a nanocrystalline solid nickel and molybdenum solution with a face-centred cubic (FCC) lattice with a high density of chaotically distributed dislocations and high microstrain value. The scanning electronic microscopy (SEM) showed that two particle structures were formed: larger cauliflower-like particles and smaller dendriteshaped ones. The thermal stability of the alloy was examined by differential scanning calorimetry (DSC) and by measuring the temperature dependence of the electrical resistivity and magnetic permeability. Structural powder relaxation was carried out in the temperature range of 450 K to 560 K causing considerable changes in the electrical resistivity and magnetic permeability. Upon structural relaxation, the magnetic permeability of the cooled alloy was about 80% higher than the magnetic permeability of the fresh powder. The crystallisation of the amorphous portion of the powder and crystalline grain increase occurred in the 630 K to 900 K temperature interval. Upon crystallisation of the amorphous phase and crystalline grain increase, the powder had about 50% lower magnetic permeability than the fresh powder and 3.6 times lower permeability than the powder where only structural relaxation took place

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