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Title: Friction Consolidation of Gas-Atomized Fe-Si Powders for Soft Magnetic Applications

Abstract

Soft magnetic materials are often limited in scalability due to conventional processes that do not retain beneficial microstructures, and their associated physical properties, during densification. In this work, friction consolidation (FC) has been studied to fabricate Fe-Si soft magnetic materials from gas-atomized powder precursors. Fe-Si powder is consolidated using variable pressure and tool rotation speed in an effort to evaluate this unique densification approach for potential improvements in magnetic properties. FC, due to the high shear deformation involved, is shown to result in uniform gradual grain structure refinement across the consolidated workpiece from the center nearest the tool to the edge. Magnetic properties along different orientations indicate little, if any, textural orientation in the refined grain structure. The effect of annealing on the magnetic properties is evaluated and shown to decrease coercivity. FC processing was able to retain the magnetization of the original gas-atomized powders but further process optimization is needed to reach the optimal coercivity for the soft magnetic materials applications.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1339795
Report Number(s):
PNNL-SA-120598
Journal ID: ISSN 1044-5803
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Materials Characterization
Additional Journal Information:
Journal Volume: 123; Journal ID: ISSN 1044-5803
Publisher:
Elsevier
Country of Publication:
United States
Language:
English

Citation Formats

Jiang, Xiujuan, Whalen, Scott A., Darsell, Jens T., Mathaudhu, Suveen, and Overman, Nicole R. Friction Consolidation of Gas-Atomized Fe-Si Powders for Soft Magnetic Applications. United States: N. p., 2017. Web. doi:10.1016/j.matchar.2016.11.026.
Jiang, Xiujuan, Whalen, Scott A., Darsell, Jens T., Mathaudhu, Suveen, & Overman, Nicole R. Friction Consolidation of Gas-Atomized Fe-Si Powders for Soft Magnetic Applications. United States. doi:10.1016/j.matchar.2016.11.026.
Jiang, Xiujuan, Whalen, Scott A., Darsell, Jens T., Mathaudhu, Suveen, and Overman, Nicole R. Sun . "Friction Consolidation of Gas-Atomized Fe-Si Powders for Soft Magnetic Applications". United States. doi:10.1016/j.matchar.2016.11.026.
@article{osti_1339795,
title = {Friction Consolidation of Gas-Atomized Fe-Si Powders for Soft Magnetic Applications},
author = {Jiang, Xiujuan and Whalen, Scott A. and Darsell, Jens T. and Mathaudhu, Suveen and Overman, Nicole R.},
abstractNote = {Soft magnetic materials are often limited in scalability due to conventional processes that do not retain beneficial microstructures, and their associated physical properties, during densification. In this work, friction consolidation (FC) has been studied to fabricate Fe-Si soft magnetic materials from gas-atomized powder precursors. Fe-Si powder is consolidated using variable pressure and tool rotation speed in an effort to evaluate this unique densification approach for potential improvements in magnetic properties. FC, due to the high shear deformation involved, is shown to result in uniform gradual grain structure refinement across the consolidated workpiece from the center nearest the tool to the edge. Magnetic properties along different orientations indicate little, if any, textural orientation in the refined grain structure. The effect of annealing on the magnetic properties is evaluated and shown to decrease coercivity. FC processing was able to retain the magnetization of the original gas-atomized powders but further process optimization is needed to reach the optimal coercivity for the soft magnetic materials applications.},
doi = {10.1016/j.matchar.2016.11.026},
journal = {Materials Characterization},
issn = {1044-5803},
number = ,
volume = 123,
place = {United States},
year = {2017},
month = {1}
}