Path toward tougher Ce-Co-Fe-Cu magnet

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image showing typical fracture pattern (black) in Ce-Co-Fe-Cu (yellow shadow: Al phase).
Typical fracture pattern (black) in Ce-Co-Fe-Cu (yellow shadow: Al phase).

CMI researchers at Ames National Laboratory conducted the research for this highlight

Innovation
Identified an effective method to improve the mechanical properties of Ce-Co-Fe-Cu gap magnet.

Achievement

  • Additives CaF2 and Al improve mechanical properties by arresting crack growth while CeO2 deflects crack path during propagation.
  • The additives improve fracture strain by 3 – 8%, compared with a reference sample.

Significance and Impact

  • Ce-Co-Fe-Cu is a potential “gap” magnet suitable for many applications including vehicle auxiliary motors.
  • Improved mechanical properties will enhance reliability in service conditions.
  • Tougher Ce-Co-Fe-Cu magnets will also reduce materials losses during manufacturing and post-manufacturing processing.

Hub Goal Addressed
Increase speed of discovery and integration.

Stress-strain curve of Ce-Co-Fe-Cu without/with different doped particles.
Stress-strain curve of Ce-Co-Fe-Cu without/with different doped particles.