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Fracture Toughness and Magnetic Properties of Sm2Co17-Based Magnets

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Abstract:

We present our findings of increased fracture toughness in high performance Sm2Co17-type magnet. The new Sm(Co 0.65 Fe 0.24 Cu 0.08 Zr 0.03)7.6magnet exhibits remanence of 11.13 kGs, maximum energy of 30.2 MGOe. This magnet shows not only a superhigh fracture toughness of 5.56 MPa m 1/2 but also distinguished yielding combined with an enhanced plastic plateau of 30 % to failure. It has been found that debonding, crack deflection, crac k branching and bridging are the major toughening mechanisms for the observed high toughness and long yield plateau. Long and straight screw dislocations observed in Sm rich precipitates accelerate the debonding of Sm rich grains.

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Periodical:

Advanced Materials Research (Volume 645)

Pages:

81-84

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.645.81

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Online since:

January 2013

Authors:

Ai Kun Li, Li Ya Li, Yuan Dong Peng, Jian Hong Yi

Keywords:

Fracture Toughness, Magnetic Property, Permanent Magnet, Toughening Mechanism

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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