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

JOURNAL OF ALLOYS AND COMPOUNDS

卷:741

Article

Jayaraman, T. V.¹  Meka, V. M.¹  Jiang, X.²  Overman, N. R.²  Doyle, J.³  Shield, J. E.³  Mathaudhu, S. N.^2,4 

[1] Univ Michigan, Dept Mech Engn, Dearborn, MI 48128 USA

[2] Pacific Northwest Natl Lab, Richland, WA USA

[3] Univ Nebraska, Dept Mech & Mat Engn, Lincoln, NE USA

[4] Univ Calif Riverside, Dept Mech Engn, Riverside, CA 92521 USA

关键词: Iron-silicon alloys;    Rapid solidification;    Elevated temperature magnetic properties;    Lattice parameter;   

DOI  :  10.1016/j.jallcom.2018.01.088

来源: Elsevier

【 摘 要 】

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 propertiesdsaturation magnetization (M-S) and intrinsic coercivity (H-CI)-of rapidly-solidified (meltspun) 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 similar to 15 and 60 mu m and 500-800 mu m, respectively. The x-ray diffraction spectra of the melt-spun ribbons indicated the presence of disordered alpha-phase, irrespective of the composition, and the wheel surface speed. The lattice parameter decreased gradually as a function of increasing silicon content from similar to 0.2862 nm (Fe-3 wt.% Si) to similar 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 MS. Elevated temperature evaluation of the magnetization (M-T curves at similar to 7.96 kA/m) in the case of Fe-3 & 5 wt.% Si alloy ribbons was distinctly 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 MS 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. It appears that rapidly-solidified Fe-3 wt.% Si and Fe-5 wt.% Si alloys ribbons are primarily comprised of the alpha-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. (c) 2018 Elsevier B.V. All rights reserved.

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