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Structural and Magnetic Properties of Fe–Co/Al2O3 Nanocomposite Powder Produced by Mechanical Alloying

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Powder Metallurgy and Metal Ceramics Aims and scope

The effect of milling time and addition of elements on the microstructure, magnetic and mechanical properties of the Fe–xCo (x = 0, 5, 10, and 20 wt.%) matrix nanocomposite reinforced with 40 wt.% Al2O3 during mechanical alloying is examined. Fe–Al2O3 and Fe–Co–Al2O3 alloys are milled for 5, 15, 20, and 30 h and 20 h, respectively. The balance between the welding and fracturing and a steady-state situation is found out in the Fe–Co–40 wt.% Al2O3 nanocomposite after 20 h, due to the Co introduction into the Fe matrix, but not in the Fe–Al2O3 nanocomposite. After 30 h of milling, the average crystallite size was 5 nm in the Fe matrix. The lattice strain increased to ~0.64% in the Fe matrix after ≤30 h of milling and in the binary Fe–20 wt.% Co matrix after 20 h of milling; the average crystallite size was 3 nm. The lattice strain increased to ~0.56% for the Fe–20 wt.% Co matrix after ≤20 h of milling. The coercive field (Hc) increased from 6.407 to 82.027 Oe, while the saturation magnetization (Ms) decreased from 20.732 to 15.181 emu/g in the Fe matrix during milling. The Hc and Ms are maximum for the binary matrix (20 and 10% Co, respectively).

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Authors and Affiliations

  1. Research Center in Industrial Technologies (CRTI), P.O.Box 64, 16014, Algiers, Cheraga, Algeria

    A. Younes & M. Zergoug

  2. University of Saad Dahleb, Laboratory of Surface Treatment & Materials, Algerie 270, Route de Soumaa, (09000), Blida, Algeria

    A. Younes, N. E. Bacha & N. Dilmi

Authors
  1. A. Younes
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  2. N. E. Bacha
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  3. M. Zergoug
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Correspondence to A. Younes.

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Published in Poroshkovaya Metallurgiya, Vol. 56, Nos. 3–4 (514), pp. 37–48, 2017.

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Younes, A., Bacha, N.E., Zergoug, M. et al. Structural and Magnetic Properties of Fe–Co/Al2O3 Nanocomposite Powder Produced by Mechanical Alloying. Powder Metall Met Ceram 56, 148–157 (2017). https://doi.org/10.1007/s11106-017-9881-9

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  • DOI: https://doi.org/10.1007/s11106-017-9881-9

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