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Title: Magnetostrictive performance of additively manufactured CoFe rods using the LENS (TM) system

Magnetostrictive materials exhibit a strain in the presence of a variable magnetic field. While they normally require large, highly oriented crystallographic grains for high strain values, metal additive manufacturing (3D printing) may be able to produce highly textured polycrystalline rods, with properties comparable to those manufactured using the more demanding free standing zone melting (FSZM) technique. Rods of Co 75.8Fe 24.2 and Co 63.7Fe 36.3 have been fabricated using the Laser engineered net shaping (LENS TM) system to evaluate the performance of additively manufactured magnetic and magnetostrictive materials. The 76% Co sample showed an average magnetostriction (λ) of 86 ppm at a stress of 124 MPa; in contrast, the 64% Co sample showed only 27 ppm at the same stress. For direct comparison, a Co 67Fe 33 single crystal disk, also measured as part of this study, exhibited a magnetostriction value of 131 and 91 microstrain in the [100] and [111] directions, respectively, with a calculated polycrystalline value (λ s) of 107 microstrain. Electron back scattered diffraction (EBSD) has been used to qualitatively link the performance with crystallographic orientation and phase information, showing only the BCC phase in the 76% Co sample, but three different phases (BCC, FCC, and HCP)more » in the 64% Co sample.« less
ORCiD logo [1] ;  [1] ;  [2] ;  [1] ;  [3] ;  [2] ; ORCiD logo [2] ;  [4]
  1. Naval Surface Warfare Center, Bethesda, MD (United States). Physical Metallurgy and Fire Protection Branch
  2. Ames Lab., Ames, IA (United States). Division of Materials Science & Engineering
  3. Univ. of Louisiana at Lafayette, Lafayette, LA (United States). Dept. of Physics
  4. Ames Lab., Ames, IA (United States). Division of Materials Science & Engineering; Iowa State Univ., Ames, IA (United States). Dept. of Materials Science and Engineering
Publication Date:
Report Number(s):
Journal ID: ISSN 2158-3226
Grant/Contract Number:
Publisher's Accepted Manuscript
Journal Name:
AIP Advances
Additional Journal Information:
Journal Volume: 8; Journal Issue: 5; Journal ID: ISSN 2158-3226
American Institute of Physics (AIP)
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1436428