Title: Investigation of structural and magnetic properties of rapidly-solidified iron-silicon alloys at ambient and elevated temperatures

Abstract

Here we investigated the ambient temperature structural properties (thickness, width, microstructure, and lattice parameter), and the ambient and high temperature (up to 900 K) direct current (DC) magnetic properties—saturation magnetization (M_S) and intrinsic coercivity (H_CI)—of rapidly-solidified (melt-spun) Fe-x wt.% Si (x = 3, 5, & 8) alloys. The wheel surface speeds selected for the study were 30 m/s and 40 m/s. The ribbons produced at the lower wheel surface speed (30 m/s) were continuous having relatively uniform edges compared to the ribbons produced at the higher wheel surface speed. The thickness and the width of the melt-spun ribbons ranged between ~15 and 60 μm and 500–800 μm, respectively. The x-ray diffraction spectra of the melt-spun ribbons indicated the presence of disordered α-phase, irrespective of the composition, and the wheel surface speed. The lattice parameter decreased gradually as a function of increasing silicon content from ~0.2862 nm (Fe-3 wt.% Si) to ~0.2847 nm (Fe-8 wt.% Si). The wheel surface speed showed an insignificant effect on M_S while increased silicon content resulted in a decreasing trend in M_S. Elevated temperature evaluation of the magnetization (M-T curves at ~7.96 kA/m) in the case of Fe-3 & 5 wt.% Si alloy ribbons was distinctlymore » different from that of the Fe-8 wt.% Si alloy ribbons. The curves of the as-prepared Fe-3 wt.% Si and Fe-5 wt.% Si alloy ribbons were irreversible while that of Fe-8 wt.% Si was reversible. The M_S for any of the combinations of wheel surface speed and composition decreased monotonically with the increase in temperature (from 300 to 900 K). While H_CI increased with the increase in temperature for all the wheel surface speed and composition combination, its nature of increase is distinct for Fe-8 wt.% Si alloy ribbons compared to Fe-3 & 5 wt.% Si alloys ribbons. Finally, it appears that rapidly-solidified Fe-3 wt.% Si and Fe-5 wt.% Si alloys ribbons are primarily comprised of the α phase (disordered phase) while the Fe-8 wt.% Si alloy ribbons are comprised primarily of disordered phase along with minor constituents of an ordered phase.« less

Authors:

Jayaraman, T. V.  ^[1];

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Meka, V. M.  ^[1];

• Search DOE PAGES for author "Meka, V. M."
• Search DOE PAGES for ORCID "0000-0002-3133-2679"

Jiang, X. ^[2]; Overman, N. R. ^[2]; Doyle, J. ^[3]; Shield, J. E. ^[3]; Mathaudhu, S. N. ^[4]

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+ Show Author Affiliations

1. Univ. of Michigan, Dearborn MI (United States). Dept. of Mechanical Engineering
2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
3. Univ. of Nebraska, Lincoln, NE (United States). Dept. of Mechanical and Materials Engineering
4. Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Univ. of California, Riverside, CA (United States). Dept. of Mechanical Engineering

Publication Date:

Tue Jan 09 00:00:00 EST 2018

Research Org.:

Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1416968

Alternate Identifier(s):

OSTI ID: 1496355

Grant/Contract Number:  

AC05-76RL01830

Resource Type:

Accepted Manuscript

Journal Name:

Journal of Alloys and Compounds

Additional Journal Information:

Journal Volume: 741; Journal ID: ISSN 0925-8388

Publisher:

Elsevier

Country of Publication:

United States

Language:

English

Subject:

36 MATERIALS SCIENCE; Iron-silicon alloys; Rapid solidification; Elevated temperature magnetic properties; Lattice parameter