Simultaneous variations of microstructure and magnetic properties of Ni58Fe12Zr20B10 nanostructure/amorphous alloy prepared by mechanical alloying |
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Authors: | R. Besmel H. Shokrollahi |
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Affiliation: | 1. Materials Science and Engineering Department, Islamic Azad University Ahvaz Branch, 61349–37333 Ahvaz, Iran;2. Electroceramics Group, Materials Science and Engineering Department, Shiraz University of Technology, 71555–313, Shiraz, Iran |
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Abstract: | This study aims to evaluate magnetic and micro-structural properties of amorphous/nanocrystalline mechanically alloyed Ni58Fe12Zr20B10 powders with ball-milling time up to 190 h. Structural, micro-structural and thermal evaluations of the milled powders were carried out by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and differential scanning calorimetry (DSC) methods. Magnetic properties were also measured by a vibrating sample magnetometer (VSM) instrument. Results showed that the amorphous phase reached maximum value of 95% and the crystallite size was about 3 nm at the end of the milling. Magnetization saturation (Ms) decreased slightly and coercivity (Hc) reached to the highest value at 72 h of the milling time. At the 190 h of milling, the coercivity and saturation magnetization reached 18 Oe and 20 emu/g, respectively. While, after an appropriate amount of heat treatment, these two variables became approximately 2 Oe and 32 emu/g. |
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Keywords: | Mechanical alloying Nanomaterials Microstructure Magnetic property X-ray analysis |
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