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Rapid Solidification of Sm-Co Permanent Magnets

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Abstract

In this article, we report the microstructural evolution of rapidly solidified Sm-Co alloys from 4 to 16 at. pct Sm. We have observed a wide variety of phase formation and microstructures, ranging from primary Co dendrite formation to eutectic structures to the formation of the metastable SmCo7 compound. In particular, we observed nonequilibrium formation of Co along with SmCo7, whose presence caused a decrease in coercivity from ∼10 kOe to 500 Oe. Alloying elements reduced the scale of the microstructure, effectively offsetting the detrimental effects of the Co phase formation and leading to a recovery of the coercivity. The eutectic structure with Co rods surrounded by SmCo7 provides a natural path to nanoscale hard/soft magnetic nanocomposites, where control of scale and phase content is critical.

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Acknowledgments

This work was supported by the National Science Foundation, under Grant No. DMR-0305354, and the Nebraska Research Initiative. The authors also acknowledge QSPINS, funded by the National Science Foundation under Grant No. 0213808, for facility support.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Center for Materials Research and Analysis, University of Nebraska, Lincoln, NE, 68588, USA

    V.K. RAVINDRAN (Graduate Student) & J.E. SHIELD (Associate Professor)

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  1. V.K. RAVINDRAN
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  2. J.E. SHIELD
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Correspondence to J.E. SHIELD.

Additional information

This article is based on a presentation made in the symposium entitled “Phase Transformations in Magnetic Materials”, which occurred during the TMS Annual Meeting, March 12–16, 2006, in San Antonio, Texas, under the auspices of the Joint TMS/MPMD and ASMI-MSCTS Phase Transformations Committee.

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RAVINDRAN, V., SHIELD, J. Rapid Solidification of Sm-Co Permanent Magnets. Metall Mater Trans A 38, 732–737 (2007). https://doi.org/10.1007/s11661-006-9028-y

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