Structure and Magnetic Properties of MnAl/α-Fe Nano-Composite Powders Prepared by High-Energy Ball Milling

Abstract:

Novel nano-composite powders composed of hard-magnetic Mn₅₄Al₄₆ and soft-magnetic α-Fe were prepared by high-energy ball milling. The effect of α-Fe and preparation conditions on the structure and magnetic properties of the composite powders has been investigated. The ε-MnAl transforms to γ-MnAl, τ-MnAl, and β-phase under ball milling and annealing. The saturation magnetization and coercivity of the two-phase samples decrease with increasing temperature for the τ-phase decomposes at elevated temperatures. With increasing iron content, the coercivity decrease first and then increase up to 0.33 T when the Fe content is 10 wt%. Further addition of the magnetically soft iron phase would result in a decrease of the coercivity.

• Periodical: Advanced Materials Research (Volumes 287-290)
• Pages: 1492-1495
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.287-290.1492
• Online since: July 2011
• Authors: Hai Xia Wang, Ping Zhan Si, Wei Jiang, Jin Jun Liu, Jung Goo Lee, C.J. Choi, Hong Liang Ge
• Keywords: Ball Milling, MnAl Magnet, MnAl/Fe Nanocomposite

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