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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