Modeling mechanical properties in Sm-Co magnets

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3D Microstructure of Sm-Co  magnet with 1 vol.% MgO particles (yellow particles).
3D Microstructure of Sm-Co  magnet with 1 vol.% MgO particles (yellow particles). 

CMI researchers at Ames Laboratory conducted the research for this highlight

Achievement
Microstructural modeling has revealed an optimum concentration of a strengthening phase necessary for enhanced mechanical properties. Our results show that addition of MgO beyond 0.5 – 1 vol.% becomes detrimental to the mechanical properties of Sm-Co.

Significance and impact

  • Using less amount of MgO will enable enhancement in mechanical properties without substantially diluting magnetic performance. 
  • This result can guide experimental team in the new effort to use MgO for strengthening fracture toughness of Sm-Co and reduce wastes during processing and service.

Next steps

  • Understand the role of grain size on the optimum MgO concentration.
  • Perform computational microstructure design to simultaneously achieve high performance in both magnetic and mechanical properties.
  • Extend the work to Nd-Fe-B.
Stress-strain curve of Sm-Co magnet as a function of the MgO particles.
Stress-strain curve of Sm-Co magnet as a function of the MgO particles.