Milling and subsequent thermal annealing effects on the microstructural and magnetic properties of nanostructured Fe90Co10 and Fe65Co35 powders |
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Authors: | M. Delshad Chermahini H. Shokrollahi |
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Affiliation: | aDepartment of Metallurgy, School of Engineering, Shahid Bahonar University of Kerman, P.O. Box No. 76135-133, Kerman, Iran;bDepartment of Materials Science and Engineering, Shiraz University of Technology, P.O. Box No. 71555-313 Shiraz, Iran |
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Abstract: | The influence of milling and subsequent annealing on the microstructural and magnetic properties of Fe90Co10 and Fe65Co35 alloys is investigated. After milling for 8 h a body-centred cubic nanostructured Fe–Co alloy forms with an average crystallite size of about 12 nm. The magnetization saturation (MS) increases 16% for Fe65Co35 and 5% for Fe90Co10 alloys by milling for 8 h. Subsequent annealing of Fe90Co10 and Fe65Co35 powders for 105 min at 550 °C improves the MS about 6 and 11%, respectively. Before annealing, the coercivity increases (up to 60 Oe) by milling for 3 h, followed by a reduction on milling for longer periods (45 h). At the initial stage of the heating, a sharp decrease in HC to 8–10 Oe occurs due to the relief of internal strain. Further heating leads to an increase in the coercivity (intermediate times) followed by a slight diminution on heating for final stage. |
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Keywords: | Nanostructured materials Mechanical alloying Microstructure Magnetic measurements |
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