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Title: Characterization of ordering in Fe-6.5%Si alloy using X-ray, TEM, and magnetic TGA methods

Journal Article · · Materials Characterization
 [1];  [2];  [3];  [2];  [2];  [2];  [1];  [1];  [1]
  1. Ames Lab., Ames, IA (United States). Division of Materials Science and Engineering; Iowa State Univ., Ames, IA (United States). Dept. of Material Science and Engineering
  2. Ames Lab., Ames, IA (United States). Division of Materials Science and Engineering
  3. Iowa State Univ., Ames, IA (United States). Dept. of Material Science and Engineering

Fe-6.5wt%Si steel surpasses the current extensively used Fe-3.2wt%Si steel in lower iron loss, higher permeability, and near zero magnetostriction. As a cost effective soft magnetic material, Fe-6.5wt%Si may find applications in motors, transformers, and electronic components. However, the brittleness of the alloy poses processing challenges. The brittleness in Fe-6.5wt%Si is attributed to the formation of ordered phases. Evaluation of the amount of ordered phases is important for the research and development of Fe-6.5wt%Si. This paper aims to find effective ways to evaluate the ordering degree through a comparison of various characterization techniques. In order to tune the ordering degree, various speeds were used to prepare Fe-6.5wt%Si samples via melt spinning. The varying wheel speed changes the cooling rate, which was confirmed by thermal imaging. In addition to the widely used TEM and normal theta-2theta X-ray diffraction methods, two quantitative methods were adopted for this Fe-6.5wt%Si system to study the ordering degree. One method is based on rotating crystal XRD technique, and the other is magnetic thermal analysis technique. Finally, these two methods effectively quantified the varying degree of ordering presented in the samples and were deemed more suitable than the TEM, normal theta-2theta XRD methods for Fe-Si due to their ease of sample preparation and short turn-around time.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
EE0007794; AC02-07CH11358; AC02-06CH11357
OSTI ID:
1573489
Alternate ID(s):
OSTI ID: 1577375; OSTI ID: 1864012
Report Number(s):
IS-J 10071; TRN: US2001360
Journal Information:
Materials Characterization, Vol. 158, Issue C; ISSN 1044-5803
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 15 works
Citation information provided by
Web of Science

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