MICROSTRUCTURAL AND THERMAL PROPERTIES OF NANOCRYSTALLINE FE POWDERS

Type : Article de conférence
Auteur(s) :  S. Azzaza, S. Alleg
Année :  2010
Domaine : Sciences des matériaux
Conférence: Conférence Internationale sur le Soudage, le CND et l’Industrie des Métaux, IC-WNDT-MI’10
Résumé en PDF :  (résumé en pdf)
Fulltext en PDF :  (.pdf)
Mots clés :  Nanomaterials ; Iron; Microstructure; Thermal properties

Résumé : 

The microstructural evolution and thermal properties of nanocrystalline Fe during mechanical milling were investigated by using quantitative X-ray diffraction and thermal analysis techniques. Upon milling of the Fe powders with coarse grains, grain refinement takes place gradually and a steady-state grain size in the nanometer regime (about 13,8 nm) is reached after a certain period of milling. the paramagnetic nanostructured bcc α-Fe domain is extended by about 50°C at the expense of both the magnetic bcc α-Fe and nonmagnetic fcc γ -Fe as compared to coarse grained bcc α-Fe