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High Strength Soft Magnetic Composites

Published online by Cambridge University Press:  21 March 2011

Ronghai Yu ,
Michelle M. Corte-Real ,
Adrian Gorea ,
Libo Ren ,
Azar Parvizi-Majidi  and
John Q. Xiao
Ronghai Yu
Affiliation:
Department of Physics and Astronomy, University of Delaware, Newark DE 19716, USA
Michelle M. Corte-Real
Affiliation:
Department of Physics and Astronomy, University of Delaware, Newark DE 19716, USA
Adrian Gorea
Affiliation:
Department of Physics and Astronomy, University of Delaware, Newark DE 19716, USA
Libo Ren
Affiliation:
Department of Mechanical Engineering, University of Delaware, Newark DE 19716, USA
Azar Parvizi-Majidi
Affiliation:
Department of Mechanical Engineering, University of Delaware, Newark DE 19716, USA
John Q. Xiao
Affiliation:
Department of Physics and Astronomy, University of Delaware, Newark DE 19716, USA
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Abstract

There has been an increasing demand for high temperature soft magnetic materials with mechanical properties better than those of existing commercial materials such as FeCo alloys. We have designed new magnetic composites by reinforcing FeCo alloys with high strength tungsten fibers. The composite materials were fabricated by electrodeposition. In general, the as-deposited composites have a relatively high coercivity Hc and low magnetic permeability μ, because of induced strain during fabrication. After appropriate thermal annealing, the composites have good soft magnetic properties, comparable to commercial bulk alloys. However, the saturation induction is reduced due to the non-magnetic inclusions. The composites also show significant enhancements in yield strength and tensile strength that increases linearly with fiber volume fraction as seen in other common composite materials. In addition, near zero creep is observed at 600 °C under a stress of 600 Mpa. The mechanical properties can be further improved by co-depositing soft magnetic material and Al2O3 onto the fibers. An approximately linear relationship was observed between the coercivity and volume fraction of Al2O3 particles. The square-root relationship was observed between the hardness and the Al2O3 concentration.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 674: Symposia T/U/V – Applications of Ferromagnetic and Optical Materials, Storage and Magnetoelectronics , 2001 , U5.4
Copyright
Copyright © Materials Research Society 2001

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References

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