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07-03-2018 | Metals | Issue 11/2018

Journal of Materials Science 11/2018

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

Journal:
Journal of Materials Science > Issue 11/2018
Authors:
Niyanth Sridharan, Ercan Cakmak, Fred A. List, Huseyin Ucar, Steve Constantinides, S. S. Babu, S. K. McCall, M. Parans Paranthaman
Important notes
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)

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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