Proceedings of the Korean Powder Metallurgy Institute Conference (한국분말야금학회:학술대회논문집)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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A Study on Fracture Behavior and Impact Stability of Sintered Rare-earth Permanent Magnets

  • Li, Wei (Division of Functional Materials, Central Iron & Steel Research Institute) ;
  • Li, Anhua (Division of Functional Materials, Central Iron & Steel Research Institute) ;
  • Wang, Huijie (Division of Functional Materials, Central Iron & Steel Research Institute) ;
  • Dong, Shengzhi (Division of Functional Materials, Central Iron & Steel Research Institute) ;
  • Guo, Yongquan (Division of Functional Materials, Central Iron & Steel Research Institute)
  • Published : 2006.09.24
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Abstract

The fracture behavior and mechanical characteristics of sintered rare-earth magnets were investigated. It shows that the fracture behavior and bending strength of the magnets obviously exhibit anisotropy. Sm-Co magnets tend to cleavage fracture in the close-packed (0001) plane or in the ($10\bar{1}1$) plane. The fracture mechanism of $Nd_2Fe_{14}B$ magnet mainly appears to be intergranular fracture. The anisotropy of fracture behavior and mechanical strength of sintered rare-earth magnets is caused mainly by the strong crystal-structure anisotropy and the grain alignment texture. The effects of Nd content, and Pr, Dy substitution on the impact stability of $Nd_2Fe_{14}B$ magnets were also reported.

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