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Title: Coercivity and nanostructure of melt-spun Ti-Fe-Co-B-based alloys

Nanocrystalline Ti-Fe-Co-B-based alloys, prepared by melt spinning and subsequent annealing, have been characterized structurally and magnetically. X-ray diffraction and thermomagnetic measurements show that the ribbons consist of tetragonal Ti 3(Fe,Co) 5B 2, FeCo-rich bcc, and NiAl-rich L2 1 phases; Ti 3(Fe,Co) 5B 2, is a new substitutional alloy series whose end members Ti 3Co 5B 2 and Ti 3Fe 5B 2 have never been investigated magnetically and may not even exist, respectively. Two compositions are considered, namely Ti 11+xFe 37.5-0.5xCo 37.5–0.5xB 14 (x = 0, 4) and alnico-like Ti 11Fe 26Co 26Ni 10Al 11Cu 2B 14, the latter also containing an L2 1-type alloy. The volume fraction of the Ti 3(Fe,Co) 5B 2 phase increases with x, which leads to a coercivity increase from 221 Oe for x = 0 to 452 Oe for x = 4. Since the grains are nearly equiaxed, there is little or no shape anisotropy, and the coercivity is largely due to the magnetocrystallineanisotropy of the tetragonal Ti 3(Fe,Co) 5B 2 phase. The alloy containing Ni,Al, and Cu exhibits a magnetization of 10.6 kG and a remanence ratio of 0.59. Lastly, our results indicate that magnetocrystallineanisotropy can be introduced in alnico-like magnets, adding to shapemore » anisotropy that may be induced by field annealing.« less
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Univ. of Nebraska, Lincoln, NE (United States)
  2. Indian Institute of Technology, Himachal Pradesh (India)
Publication Date:
Report Number(s):
IS-J-8851
Journal ID: ISSN 2158-3226; AAIDBI
Grant/Contract Number:
DREaM Project; ECCS: 1542182; AC02-07CH11358
Type:
Published Article
Journal Name:
AIP Advances
Additional Journal Information:
Journal Volume: 6; Journal Issue: 5; Journal ID: ISSN 2158-3226
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:
77 NANOSCIENCE AND NANOTECHNOLOGY; alnico; magnetocrystalline anisotropy; coercivity; nanostructure
OSTI Identifier:
1238390
Alternate Identifier(s):
OSTI ID: 1240743; OSTI ID: 1421060

Zhang, W. Y., Skomski, R., Kashyap, A., Valloppilly, S., Li, X. Z., Shield, J. E., and Sellmyer, D. J.. Coercivity and nanostructure of melt-spun Ti-Fe-Co-B-based alloys. United States: N. p., Web. doi:10.1063/1.4942552.
Zhang, W. Y., Skomski, R., Kashyap, A., Valloppilly, S., Li, X. Z., Shield, J. E., & Sellmyer, D. J.. Coercivity and nanostructure of melt-spun Ti-Fe-Co-B-based alloys. United States. doi:10.1063/1.4942552.
Zhang, W. Y., Skomski, R., Kashyap, A., Valloppilly, S., Li, X. Z., Shield, J. E., and Sellmyer, D. J.. 2016. "Coercivity and nanostructure of melt-spun Ti-Fe-Co-B-based alloys". United States. doi:10.1063/1.4942552.
@article{osti_1238390,
title = {Coercivity and nanostructure of melt-spun Ti-Fe-Co-B-based alloys},
author = {Zhang, W. Y. and Skomski, R. and Kashyap, A. and Valloppilly, S. and Li, X. Z. and Shield, J. E. and Sellmyer, D. J.},
abstractNote = {Nanocrystalline Ti-Fe-Co-B-based alloys, prepared by melt spinning and subsequent annealing, have been characterized structurally and magnetically. X-ray diffraction and thermomagnetic measurements show that the ribbons consist of tetragonal Ti3(Fe,Co)5B2, FeCo-rich bcc, and NiAl-rich L21 phases; Ti3(Fe,Co)5B2, is a new substitutional alloy series whose end members Ti3Co5B2 and Ti3Fe5B2 have never been investigated magnetically and may not even exist, respectively. Two compositions are considered, namely Ti11+xFe37.5-0.5xCo37.5–0.5xB14 (x = 0, 4) and alnico-like Ti11Fe26Co26Ni10Al11Cu2B14, the latter also containing an L21-type alloy. The volume fraction of the Ti3(Fe,Co)5B2 phase increases with x, which leads to a coercivity increase from 221 Oe for x = 0 to 452 Oe for x = 4. Since the grains are nearly equiaxed, there is little or no shape anisotropy, and the coercivity is largely due to the magnetocrystallineanisotropy of the tetragonal Ti3(Fe,Co)5B2 phase. The alloy containing Ni,Al, and Cu exhibits a magnetization of 10.6 kG and a remanence ratio of 0.59. Lastly, our results indicate that magnetocrystallineanisotropy can be introduced in alnico-like magnets, adding to shape anisotropy that may be induced by field annealing.},
doi = {10.1063/1.4942552},
journal = {AIP Advances},
number = 5,
volume = 6,
place = {United States},
year = {2016},
month = {2}
}