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Title: Magnetic hardening of Ce 1+xFe 11–yCo yTi with ThMn 12 structure by melt spinning

A recent study on the intrinsic magnetic properties of CeFe 11–yCo yTi has revealed that substituting one Co for Fe retains the favorable magnetocrystalline anisotropy H a found in the ternary Fe end member, while enhancing the Curie temperature T c and saturation magnetization 4πM s. These findings warrant further optimization around Co substitution y = 1 to try to exploit the hard magnetic properties of these Ce-based magnets. Both Ce and Co concentrations in Ce 1+xFe 11–yCo yTi have been optimized in the range of x = 0 – 0.2 and y = 0 –1.5. It was found that Co substitution effectively enhances all hard magnetic properties, although the values are still lower than those predicted from the intrinsic magnetic properties. Specifically, T c increases from 210 °C to 285 – 350 °C; 4πM 19 (magnetization at 19 kOe) from 8.9 kG to 10.5 – 11.5 kG, remanence Br from 3.1 kG to 4.1 – 4.5 kG, and most importantly, H ci from 1.1 kOe to 1.5 kOe. As a result, the room temperature energy product (BH) max has been increased by over 100% from 0.7 MGOe in Ce 1.1Fe 11Ti to 1.5 MGOe in Ce 1.05Fe 9.75Co 1.25Ti.more » Microscopy analysis indicates that the addition of Co refines the grain size and promotes chemical homogeneity at the microscopic scale. As a result, the beneficial effect of Co on the microstructure contributes to the improved hard magnetic properties.« less
Authors:
ORCiD logo [1] ;  [2] ;  [3] ;  [2]
  1. MEDA Engineering and Technical Services LLC, Southfield, MI (United States)
  2. Iowa State Univ., Ames, IA (United States)
  3. General Motors R&D Center, Warren, MI (United States)
Publication Date:
Report Number(s):
IS-J-8688
Journal ID: ISSN 0021-8979; JAPIAU
Grant/Contract Number:
AC02-07CH11358
Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 117; Journal Issue: 17; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; melt-spinning; ThMn12; permanent magnet; Curie temperature; microstructural properties; thermodynamic properties; chemical analysis; Curie point
OSTI Identifier:
1227303