Magnetic and structural studies of mechanically alloyed (Fe<sub>50sub>Co<sub>50sub>)<sub>62sub>Nb<sub>8sub>B<sub>30sub> powder mixtures
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- 作者：S. Alleg ; S. Azzaza ; R. Bensalem ; J.J. Suñ ; ol ; S. Khene ; G. Fillion
- 关键词：Nanostructured materials ; Mechanical alloying ; Amorphization ; Magnetic measurements ; Calorimetry ; X-ray diffraction
- 刊名：Journal of Alloys and Compounds
- 出版年：2009
- 出版时间：12 August 2009
- 年：2009
- 卷：482
- 期：1-2
- 页码：86-89
- 全文大小：700 K
文摘
Amorphous (Fe<sub>50sub>Co<sub>50sub>)<sub>62sub>Nb<sub>8sub>B<sub>30sub> powder mixture was prepared by mechanical alloying from elemental Fe, Co, B and Nb powders in a planetary ball mill under argon atmosphere. Structural, thermal and magnetic properties were performed on the milled powders by means of X-ray diffraction, differential scanning calorimetry and magnetic measurements. The amorphous state is reached after 125 h of milling. The excess enthalpy due to the high density of defects is released at temperature below 300 °C. Crystallisation and growth of crystal domains are the dominating processes at high temperatures. The saturation magnetisation decreases rapidly during the first 25 h of milling to about 15.24 A m<sup>2sup>/kg and remains nearly constant on further milling. Coercivity, H<sub>csub>, value of about 160 Oe is obtained after 125 h of milling.