Rationalization of solidification mechanism of Nd–Fe–B magnets during laser directed-energy deposition

Niyanth Sridharan; Ercan Cakmak; Fred A. List; Huseyin Ucar; Steve Constantinides; S. S. Babu; S. K. McCall; M. Parans Paranthaman

doi:10.1007/s10853-018-2178-7

Rationalization of solidification mechanism of Nd–Fe–B magnets during laser directed-energy deposition

Niyanth Sridharan, Ercan Cakmak, Fred A. List, Huseyin Ucar, Steve Constantinides, S. S. Babu, S. K. McCall, M. Parans Paranthaman

Research output: Contribution to journal › Article › peer-review

23 Scopus citations

Abstract

Near-net fabrication techniques are highly beneficial to minimize rare earth metal usage to fabricate dense fully functional magnets. In this study, feasibility of using the directed-energy deposition technique for fabrication of magnets is evaluated. The results show that despite the ability to fabricate highly reactive materials in the laser deposition process, the magnetic coercivity and remanence of the hard magnets is significantly reduced. X-ray powder diffraction in conjunction with electron microscopy showed that the material experienced a primary Nd₂Fe₁₇B_x solidification. Consequently, the absence of the hard magnetic phase resulted in deterioration of the build properties.

Original language	English
Pages (from-to)	8619-8626
Number of pages	8
Journal	Journal of Materials Science
Volume	53
Issue number	11
DOIs	https://doi.org/10.1007/s10853-018-2178-7
State	Published - Jun 1 2018

Bibliographical note

Publisher Copyright:
© 2018, Springer Science+Business Media, LLC, part of Springer Nature (outside the USA).

Funding

Notice: This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/ downloads/doe-public-access-plan)

Funders	Funder number
Critical Materials Institute
US Department of Energy
Advanced Manufacturing Office	DE-AC52-07NA27344
Office of Energy Efficiency and Renewable Energy

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abstract = "Near-net fabrication techniques are highly beneficial to minimize rare earth metal usage to fabricate dense fully functional magnets. In this study, feasibility of using the directed-energy deposition technique for fabrication of magnets is evaluated. The results show that despite the ability to fabricate highly reactive materials in the laser deposition process, the magnetic coercivity and remanence of the hard magnets is significantly reduced. X-ray powder diffraction in conjunction with electron microscopy showed that the material experienced a primary Nd2Fe17Bx solidification. Consequently, the absence of the hard magnetic phase resulted in deterioration of the build properties.",

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AU - Constantinides, Steve

AU - Babu, S. S.

AU - McCall, S. K.

AU - Paranthaman, M. Parans

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AB - Near-net fabrication techniques are highly beneficial to minimize rare earth metal usage to fabricate dense fully functional magnets. In this study, feasibility of using the directed-energy deposition technique for fabrication of magnets is evaluated. The results show that despite the ability to fabricate highly reactive materials in the laser deposition process, the magnetic coercivity and remanence of the hard magnets is significantly reduced. X-ray powder diffraction in conjunction with electron microscopy showed that the material experienced a primary Nd2Fe17Bx solidification. Consequently, the absence of the hard magnetic phase resulted in deterioration of the build properties.

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Rationalization of solidification mechanism of Nd–Fe–B magnets during laser directed-energy deposition

Abstract

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