X-ray diffraction and Mössbauer studies of nanocrystalline Fe-Ni alloys prepared by mechanical alloying
Identifieur interne : 000896 ( Main/Exploration ); précédent : 000895; suivant : 000897X-ray diffraction and Mössbauer studies of nanocrystalline Fe-Ni alloys prepared by mechanical alloying
Auteurs : A. Djekoun [Algérie] ; B. Bouzabata [Algérie] ; A. Otmani [Algérie] ; J. M. Greneche [France]Source :
- Catalysis today [ 0920-5861 ] ; 2004.
Descripteurs français
- Pascal (Inist)
English descriptors
Abstract
Mechanical alloying is a powder metallurgy processing technique involving cold welding, fracturing, and rewelding of powder particles in a high-energy ball mill. Mechanical alloying is a non-equilibrium process for materials synthesis. It has been used to obtain nanocrystalline binary Fe-Ni system. Elemental powders of iron and nickel (Fe-50 at.% Ni) have been mixed in a planetary mill. The structural effects of mechanical alloying of powders were investigated by scanning electron microscopy, X-ray diffraction analysis and Mossbauer spectroscopy. It is observed a gradual formation of mixture of phases as fcc (γ) with a nanoscale grain size. In addition, as the average grain size is decreased with a progressive enlargement of peaks of X-ray diffraction, a paramagnetic phase appears after 48 h of ball milling detected by Mössbauer spectroscopy.
Affiliations:
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Le document en format XML
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<front><div type="abstract" xml:lang="en">Mechanical alloying is a powder metallurgy processing technique involving cold welding, fracturing, and rewelding of powder particles in a high-energy ball mill. Mechanical alloying is a non-equilibrium process for materials synthesis. It has been used to obtain nanocrystalline binary Fe-Ni system. Elemental powders of iron and nickel (Fe-50 at.% Ni) have been mixed in a planetary mill. The structural effects of mechanical alloying of powders were investigated by scanning electron microscopy, X-ray diffraction analysis and Mossbauer spectroscopy. It is observed a gradual formation of mixture of phases as fcc (γ) with a nanoscale grain size. In addition, as the average grain size is decreased with a progressive enlargement of peaks of X-ray diffraction, a paramagnetic phase appears after 48 h of ball milling detected by Mössbauer spectroscopy.</div>
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