Properties of magnesium based composite powders exhibiting ferromagnetism produced by mechanical alloying

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  • Aoki Sho
    Postgraduate Student, Graduate School of Industrial Technology, Nihon University
  • Kubota Masahiro
    Department of Mechanical Engineering, College of Industrial Technology, Nihon University

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  • メカニカルアロイング法で複合化されたマグネシウム基強磁性粉末の特性
  • メカニカルアロイングホウ デ フクゴウカ サレタ マグネシウムキ キョウジセイ フンマツ ノ トクセイ

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Abstract

In order to fabricate Mg-based composite powders possessing magnetic properties, pure magnesium and Ni–Cu–Zn ferrite powders were mechanically alloyed (MAed) using a vibrational ball mill. Change in Vickers microhardness of the pure magnesium powders as a function of the mechanical milling (MM) times obeyed the Hall–Petch relation. Change in Vickers microhardness of the composite powders as a function of the amount of Ni–Cu–Zn ferrite obeyed the rule of mixture when the MA time was 2 h. On the other hands, a slope of Vickers microhardness of the composite powders as a function of the amount of Ni–Cu–Zn ferrite was higher than that of a theoretical value calculated from the rule of mixture when the MA time was 4 h and 8 h. Magnetization of the composite powders obeyed the amount of the Ni–Cu–Zn ferrite powder, whereas no systematic change for coercive force was observed. Mg-based composite powders exhibiting magnetic properties were successfully produced by mechanical alloying.

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