THE INFLUENCE OF THE MECHANCAL. ALLOYNG ON THE STRUCTURAL AND MAGNETIC PROPERTIES OF NANOSTUCTURED NIFEMOT ALLOY

In this work, the structural and magnetic properties of amorphous/nanocrystalline NiFeMoT powders prepared by mechanical alloying are investigated. Structural study was carried out by X-ray diffraction, high resolution transmission electron microscopy and scanning electron microscopy. At 120h, the Ni main peak is completely broad and the crystallite size is about 3 nm with a minute amount of Mo phase due to high melting point, hardness and low diffusion at low temperature of Mo in to Ni. At 190h the intensity of Ni main peak is higher and the Ti peak is creating again. The interatomic distance between transition metals (2.545 nm) and the peak shift (A2e-1.08 degree) are maximum at 120h milling. The magnetic measurement of sample milled for 120h show low magnetic permeability and high operating frequencies up to 1000 Hz.

کلیدواژه ها:

Mechanical alloying ، X-ray diffraction ، amorphous materials ، magnetic measurements ،