Accession Number:

ADP012303

Title:

High Strength Soft Magnetic Composites

Descriptive Note:

Conference proceedings

Corporate Author:

DELAWARE UNIV NEWARK

Report Date:

2001-04-01

Pagination or Media Count:

6.0

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 Hsub c and low magnetic permeability Micro, 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 deg 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.

Subject Categories:

  • Properties of Metals and Alloys
  • Electricity and Magnetism
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE