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Journal of Applied Physics : Phase transformation sequence and magnetic properties of melt-spun SmCo-based alloy after isochronal heat treatment

By X. Y. Xiong and T. R. Finlayson

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Book Id: WPLBN0002169411
Format Type: PDF eBook :
File Size: Serial Publication
Reproduction Date: 19 November 2008

Title: Journal of Applied Physics : Phase transformation sequence and magnetic properties of melt-spun SmCo-based alloy after isochronal heat treatment  
Author: X. Y. Xiong and T. R. Finlayson
Volume: Issue : November 2008
Language: English
Subject: Science, Physics, Natural Science
Collections: Periodicals: Journal and Magazine Collection, Journal of Applied Physics Collection
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Publisher: American Institute of Physics

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Xiong And T. R. Finlayso, X. Y. (n.d.). Journal of Applied Physics : Phase transformation sequence and magnetic properties of melt-spun SmCo-based alloy after isochronal heat treatment. Retrieved from http://nationalpubliclibrary.info/


Description
Description: The phase transformation sequence, microstructure and compositions, and magnetic properties for a melt-spun Sm(Co0.68Fe0.2Cu0.1Zr0.02)7.5 alloy after isochronal heat treatments have been studied by using x-ray diffraction, transmission electron microscopy, three-dimensional atom probe (3DAP), and magnetometry. The as-spun ribbons had a single phase with the Cu7Tb structure. After being aged at 720 °C, the single phase decomposed into two major phases: 2:17R and 1:5H, and one minor CoFeZr-rich phase. The formation of the Z-phase happened after the cellular structure, requiring a higher temperature than that for the cellular structure. The 3DAP analysis showed that Zr was depleted from the 2:17R and 1:5H phases by a half while the other elements remained almost unchanged when the aging temperature increased from 720 to 840 °C. In contrast to the sintered permanent magnets, Cu was enriched in the 1:5H phase with a much higher concentration (>40 at. %). The Cu enrichment also occurred at the boundary of the Z-phase. The coercivity achieved was Hc = 4.34 kOe following aging at 720 °C. The highest maximum energy product, (BH)max, was 6.48 MG Oe after aging at 800 °C and the remanence to saturation magnetization ratio, Mr/Ms, was 0.69. This relatively low Hc and high Mr/Ms ratio may be a consequence of the formation of a significant volume fraction of the CoFeZr-rich nanocrystalline phase.

 

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