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Title: Soft magnetic composites manufactured by warm co-extrusion of bulk metallic glass and steel powders

Abstract

Soft magnetic composites of Fe-based bulk metallic glass and low-alloy steel have been manufactured by warm co-extrusion of precursor powders at temperatures within the supercooled liquid region of the glass. Composites were manufactured with amorphous volume fractions of 75%, 67%, and 100%. Full consolidation of the constituent powders was observed with the bulk metallic glass remaining substantially amorphous. The composite electrical resistivity was observed to be anisotropic with a resistivity of 79 {mu}{Omega} cm measured transverse to the extrusion axis in a sample with 75% amorphous volume fraction. A 0-3 connectivity pattern with the low-resistivity steel phase embedded in a 3-dimensionally connected high-resistivity bulk metallic glass phase was observed with scanning electron microscopy. This confirms that the flow characteristics of the bulk metallic glass and the steel powders were comparable during extrusion at these temperatures. The saturation magnetization of 1.3 T was consistent with the volume weighted average of the saturation magnetization of the two phases. A relatively high quasistatic coercivity of 8 Oe was measured and is likely due to slight crystallization of the bulk metallic glass as well as domain wall pinning at prior particle boundaries. Careful control of the thermal environment during the extrusion process is requiredmore » to minimize glass crystallization and achieve the desired balance of magnetic and electrical properties.« less

Authors:
; ; ; ;  [1]
  1. GE Global Research, Ceramic and Metallurgy Technologies, One Research Circle, Niskayuna, New York 12309 (United States)
Publication Date:
OSTI Identifier:
22102385
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 113; Journal Issue: 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2013 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANISOTROPY; COERCIVE FORCE; COMPOSITE MATERIALS; CRYSTALLIZATION; ELECTRIC CONDUCTIVITY; EXTRUSION; LOW ALLOY STEELS; MAGNETIC FLUX; MAGNETIC MATERIALS; MAGNETIZATION; METALLIC GLASSES; POWDERS; SATURATION; SCANNING ELECTRON MICROSCOPY; THREE-DIMENSIONAL CALCULATIONS

Citation Formats

Johnson, Francis, Raber, Thomas R., Zabala, Robert J., Buresh, Steve J., and Tanico, Brian. Soft magnetic composites manufactured by warm co-extrusion of bulk metallic glass and steel powders. United States: N. p., 2013. Web. doi:10.1063/1.4793610.
Johnson, Francis, Raber, Thomas R., Zabala, Robert J., Buresh, Steve J., & Tanico, Brian. Soft magnetic composites manufactured by warm co-extrusion of bulk metallic glass and steel powders. United States. https://doi.org/10.1063/1.4793610
Johnson, Francis, Raber, Thomas R., Zabala, Robert J., Buresh, Steve J., and Tanico, Brian. 2013. "Soft magnetic composites manufactured by warm co-extrusion of bulk metallic glass and steel powders". United States. https://doi.org/10.1063/1.4793610.
@article{osti_22102385,
title = {Soft magnetic composites manufactured by warm co-extrusion of bulk metallic glass and steel powders},
author = {Johnson, Francis and Raber, Thomas R. and Zabala, Robert J. and Buresh, Steve J. and Tanico, Brian},
abstractNote = {Soft magnetic composites of Fe-based bulk metallic glass and low-alloy steel have been manufactured by warm co-extrusion of precursor powders at temperatures within the supercooled liquid region of the glass. Composites were manufactured with amorphous volume fractions of 75%, 67%, and 100%. Full consolidation of the constituent powders was observed with the bulk metallic glass remaining substantially amorphous. The composite electrical resistivity was observed to be anisotropic with a resistivity of 79 {mu}{Omega} cm measured transverse to the extrusion axis in a sample with 75% amorphous volume fraction. A 0-3 connectivity pattern with the low-resistivity steel phase embedded in a 3-dimensionally connected high-resistivity bulk metallic glass phase was observed with scanning electron microscopy. This confirms that the flow characteristics of the bulk metallic glass and the steel powders were comparable during extrusion at these temperatures. The saturation magnetization of 1.3 T was consistent with the volume weighted average of the saturation magnetization of the two phases. A relatively high quasistatic coercivity of 8 Oe was measured and is likely due to slight crystallization of the bulk metallic glass as well as domain wall pinning at prior particle boundaries. Careful control of the thermal environment during the extrusion process is required to minimize glass crystallization and achieve the desired balance of magnetic and electrical properties.},
doi = {10.1063/1.4793610},
url = {https://www.osti.gov/biblio/22102385}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 17,
volume = 113,
place = {United States},
year = {Tue May 07 00:00:00 EDT 2013},
month = {Tue May 07 00:00:00 EDT 2013}
}