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Title: Rationalization of solidification mechanism of Nd–Fe–B magnets during laser directed-energy deposition [Rationalization of solidification mechanism of neodymium-iron-boron magnets obtained after laser directed-energy deposition process]

Here, 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 Nd 2Fe 17B x solidification. Consequently, the absence of the hard magnetic phase resulted in deterioration of the build properties.
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [1] ;  [5] ;  [2]
  1. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Florida Polytechnic Univ., Lakeland, FL (United States)
  4. Arnold Magnetic Technologies Corp., Rochester, NY (United States); Magnetics & Materials LLC, Honeoye, NY (United States)
  5. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-692689
Journal ID: ISSN 0022-2461; 820445
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Journal of Materials Science
Additional Journal Information:
Journal Volume: 53; Journal Issue: 11; Journal ID: ISSN 0022-2461
Publisher:
Springer
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Nd-Fe-B hard magnets; Laser additive manufacturing; Nd2Fe14B
OSTI Identifier:
1461738

Sridharan, Niyanth, Cakmak, Ercan, List, Fred A., Ucar, Huseyin, Constantinides, Steve, Babu, S. S., McCall, S. K., and Paranthaman, M. Parans. Rationalization of solidification mechanism of Nd–Fe–B magnets during laser directed-energy deposition [Rationalization of solidification mechanism of neodymium-iron-boron magnets obtained after laser directed-energy deposition process]. United States: N. p., Web. doi:10.1007/s10853-018-2178-7.
Sridharan, Niyanth, Cakmak, Ercan, List, Fred A., Ucar, Huseyin, Constantinides, Steve, Babu, S. S., McCall, S. K., & Paranthaman, M. Parans. Rationalization of solidification mechanism of Nd–Fe–B magnets during laser directed-energy deposition [Rationalization of solidification mechanism of neodymium-iron-boron magnets obtained after laser directed-energy deposition process]. United States. doi:10.1007/s10853-018-2178-7.
Sridharan, Niyanth, Cakmak, Ercan, List, Fred A., Ucar, Huseyin, Constantinides, Steve, Babu, S. S., McCall, S. K., and Paranthaman, M. Parans. 2018. "Rationalization of solidification mechanism of Nd–Fe–B magnets during laser directed-energy deposition [Rationalization of solidification mechanism of neodymium-iron-boron magnets obtained after laser directed-energy deposition process]". United States. doi:10.1007/s10853-018-2178-7.
@article{osti_1461738,
title = {Rationalization of solidification mechanism of Nd–Fe–B magnets during laser directed-energy deposition [Rationalization of solidification mechanism of neodymium-iron-boron magnets obtained after laser directed-energy deposition process]},
author = {Sridharan, Niyanth and Cakmak, Ercan and List, Fred A. and Ucar, Huseyin and Constantinides, Steve and Babu, S. S. and McCall, S. K. and Paranthaman, M. Parans},
abstractNote = {Here, 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.},
doi = {10.1007/s10853-018-2178-7},
journal = {Journal of Materials Science},
number = 11,
volume = 53,
place = {United States},
year = {2018},
month = {3}
}

Works referenced in this record:

Laser additive manufacturing of metallic components: materials, processes and mechanisms
journal, May 2012