Milling time effects on the magnetic and structural properties of the Fe70Si30 system

Effect of disorder on the structural and magnetic properties of the Fe50Si50 nanostructured system

“…SEM studies, not shown here, reveal that the mean particle size of the samples decreases from 80 lm, for the unmilled sample, to 5 lm, for the sample milled for 72 h. These results and those obtained for the mean crystallite size indicate that the obtained particles are polycrystalline. more (wright) were fitted with a doublet and a hyperfine magnetic field distribution (HMFD), the latter is associated with the Fe 3 Si ferromagnetic phase [4,6]. The mean width of the doublet increases while its quadrupolar splitting and isomer shift remains nearly constant with milling time.…”

“…Furthermore, Shinjo et al [5] studied this phase using Mössbauer spectrometry at 77 K for Fe-Si alloys heat-treated at 950°C and cooled at 0°C. A study conducted by Rodríguez et al [6] concerning the magnetic and structural properties of the Fe 0.7 Si 0.3 system, prepared by MA and milled for 1,5,9,15,75, and 100 h, reported the coexistence of the bcc, DO 3 , and FeSi phases based on XRD investigation. Additional diffraction peaks of Fe and Si were detected for samples milled between 1 and 5 h. The Mössbauer studies detected the bcc-Fe phase in the sample milled for 1 h, while for longer milling times, a broad paramagnetic component combined with a hyperfine magnetic field distribution were observed, in accordance with the disordered character induced by the MA process.…”

Investigation on Phase Evolution in Mechanically Alloyed Nano-Structured Fe-Si System

“…However, melted alloys with high Si content are very brittle. The high energy ball milling technique allows a wide range of composition to be mechanically alloyed for producing these alloys as powders with the advantage that brittleness can be ignored whatever the silicon is [5]. Recently, soft magnetic materials with a nanocrystalline structure have shown improved magnetic and electrical properties [6].…”

In situ synthesis of FeSi–Al2O3 nanocomposite powder by mechanical alloying

“…The second procedure uses powder metallurgical techniques to obtain the nanostructured powder of this material. There are several reports on the preparation of FeSi or FeSi 2 by powder metallurgical techniques [5][6][7][8][9], but there is no attempt to produce the FeSi-Al 2 O 3 nanocomposite powder by this method.…”