Magnetostrictive performance of additively manufactured CoFe rods using the LENSTM system
Abstract
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 Co75.8Fe24.2 and Co63.7Fe36.3 have been fabricated using the Laser engineered net shaping (LENSTM) 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 Co67Fe33 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 (λs) 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) in the 64% Co sample.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Dec 07, 2017
- Source ID
- 10.1063/1.5007673
Entities
People
- D. L. Schlagel
- Emrah Şimşek
- Gabriela Petculescu
- Jin-Hyeong Yoo
- Nicholas J. Jones
- Paul K. Lambert
- Ryan T. Ott
- Thomas A. Lograsso
Organizations
- Ames National Laboratory
- Iowa State University
- Naval Surface Warfare Center
- Office of Basic Energy Sciences
- Office of Naval Research
- University of Louisiana at Lafayette