Fracture Toughness of Nd<SUB>2</SUB>Fe<SUB>14</SUB>B Magnets

• Horton J. A.

  Metals and Ceramics Division, Oak Ridge National Laboratory

• Herchenroeder J. W.

  Magnequench International, Inc.

• Wright J. L.

  Metals and Ceramics Division, Oak Ridge National Laboratory

• Easton D. S.

  Metals and Ceramics Division, Oak Ridge National Laboratory

Abstract

Nd₂Fe₁₄B is currendy the best (highest energy product) hard magnet available. Like mostmagnetic materials, it is rather brittle. The fracture toughness of specimens of commercially available hard magnets were measured using a chevron notch, three-point bend test. Values for Nd₂Fe₁₄B magnets ranged from 2.5 to 5.5 MPa√m. In comparison, SmCo₅ was measured to have a fracture toughness of 1.9 MPa√m. It appears that this testing technique will allow differences in fracture toughness to be measured between alloys with different compositions and fabricated by different production methods and should be able to track the fracture toughness as improvements are made to a particular alloy.

Journal

• Materials Transactions, JIM

  Materials Transactions, JIM 37 (4), 860-863, 1996

  The Japan Institute of Metals

Keywords

• magnets
• permanent magnets
• toughness
• mechanical properties

Details

• CRID: 1390001204247737728
• NII Article ID: 10002448916
• NII Book ID: AA10699969
• DOI: 10.2320/matertrans1989.37.860
• COI: 1:CAS:528:DyaK28XjsFyjtr0%3D
• ISSN: 2432471X
• ISSN: 09161821
• Web Site: https://www.jstage.jst.go.jp/article/matertrans1989/37/4/37_4_860/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed