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MICROSTRUCTURAL AND THERMALPROPERTIES OF NANOCRYSTALLINE FEPOWDERS

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Conférence Internationale sur le Soudage, le CND et l’Industrie des Métaux, IC-WNDT-MI’10 2010

MICROSTRUCTURAL AND THERMAL PROPERTIES OF NANOCRYSTALLINE FE

POWDERS

S. Azzaza, S. Alleg

Abstract : 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 ?-Fe domain is extended by about 50°C at the expense of both the magnetic bcc ?-Fe and nonmagnetic fcc ? -Fe as compared to coarse grained bcc ?-Fe

Keywords : Nanomaterials ; Iron; Microstructure; Thermal properties

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A linear fit gives: (1) a slope of −0.65 for short milling times and (2) of −0.20 for extended milling times (Fig.1); based on the model proposed by Li et al, which describes