XRD analysis and magnetic properties of nanocrystalline Ni20Co80 alloys
Identifieur interne : 000187 ( Main/Merge ); précédent : 000186; suivant : 000188XRD analysis and magnetic properties of nanocrystalline Ni20Co80 alloys
Auteurs : N. Bensebaa [Algérie] ; N. Loudjani [Algérie] ; S. Alleg [Algérie] ; L. Dekhil [Algérie] ; J. J. Sunol [Espagne] ; M. Al Sae [Bahreïn] ; M. Bououdina [Bahreïn]Source :
- Journal of magnetism and magnetic materials [ 0304-8853 ] ; 2014.
Descripteurs français
- Pascal (Inist)
- Diffraction RX, Atmosphère contrôlée, Alliage mécanique, Broyeur satellite, Broyeur boulet, Relation fabrication propriété, Hystérésis magnétique, Microstructure, Force coercitive, Aimantation saturation, Nanocristal, Alliage base cobalt, Solution solide, Réseau cubique face centrée, Réseau hexagonal compact, Composé intermétallique, Nickel alliage, Métal transition alliage.
English descriptors
- KwdEn :
- Ball mill, Cobalt base alloys, Coercive force, Controlled atmospheres, FCC lattices, Fabrication property relation, HCP lattices, Intermetallic compounds, Magnetic hysteresis, Mechanical alloying, Microstructure, Nanocrystal, Nickel alloys, Planetary mill, Saturation magnetization, Solid solutions, Transition element alloys, XRD.
Abstract
The mechanical alloying process has been used to prepare nanocrystalline Ni20Co80 alloy from elemental Ni and Co powders in a planetary ball mill under argon atmosphere. Scanning electron microscopy, X-ray diffraction and magnetic measurements were carried out to investigate morphological, structural, microstructural and magnetic properties changes during the milling process. The interdiffusion of Co and Ni leads to a heterogeneous solid solution with Ni-rich and Co-rich environments after 12 h of milling. The end product is a mixture of a highly disordered structure, fcc-Ni(Co), fcc-Co(Ni) and hcp-Co (Ni) phases having different microstructural and structural parameters. The coercivity, Hc, decreases rapidly up to 3 h of milling to about 58.3 Oe and remains constant on further milling. The saturation magnetization, Ms, value of about 126 emu/g is obtained after 48 h of milling.
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<front><div type="abstract" xml:lang="en">The mechanical alloying process has been used to prepare nanocrystalline Ni<sub>20</sub>
Co<sub>80</sub>
alloy from elemental Ni and Co powders in a planetary ball mill under argon atmosphere. Scanning electron microscopy, X-ray diffraction and magnetic measurements were carried out to investigate morphological, structural, microstructural and magnetic properties changes during the milling process. The interdiffusion of Co and Ni leads to a heterogeneous solid solution with Ni-rich and Co-rich environments after 12 h of milling. The end product is a mixture of a highly disordered structure, fcc-Ni(Co), fcc-Co(Ni) and hcp-Co (Ni) phases having different microstructural and structural parameters. The coercivity, H<sub>c</sub>
, decreases rapidly up to 3 h of milling to about 58.3 Oe and remains constant on further milling. The saturation magnetization, M<sub>s</sub>
, value of about 126 emu/g is obtained after 48 h of milling.</div>
</front>
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