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

Zhang, W. Y.; Skomski, R.; Kashyap, A.; Valloppilly, S.; Li, X. Z.; Shield, J. E.; Sellmyer, D. J.

doi:10.1063/1.4942552

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

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Abstract

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 Ti_11+xFe_37.5-0.5xCo_37.5–0.5xB₁₄ (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.

Authors:: Zhang, W. Y.; Skomski, R.; Kashyap, A.; Valloppilly, S.; Li, X. Z.; Shield, J. E.; Sellmyer, D. J.

Publication Date:: Sun May 01 00:00:00 EDT 2016

Research Org.:: Ames Lab., Ames, IA (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1238390

Alternate Identifier(s):: OSTI ID: 1240743; OSTI ID: 1421060

Report Number(s):: IS-J-8851
Journal ID: ISSN 2158-3226

Grant/Contract Number:: DREaM Project; ECCS: 1542182; AC02-07CH11358

Resource Type:: Published Article

Journal Name:: AIP Advances

Additional Journal Information:: Journal Name: AIP Advances Journal Volume: 6 Journal Issue: 5; Journal ID: ISSN 2158-3226

Publisher:: American Institute of Physics

Country of Publication:: United States

Language:: English

Subject:: 77 NANOSCIENCE AND NANOTECHNOLOGY; alnico; magnetocrystalline anisotropy; coercivity; nanostructure

Citation Formats


                    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., 2016. 
Web.  doi:10.1063/1.4942552.

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                    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.  https://doi.org/10.1063/1.4942552

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                    Zhang, W. Y., Skomski, R., Kashyap, A., Valloppilly, S., Li, X. Z., Shield, J. E., and Sellmyer, D. J. Sun .  
"Coercivity and nanostructure of melt-spun Ti-Fe-Co-B-based alloys".  United States.  https://doi.org/10.1063/1.4942552.

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@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         = {Sun May 01 00:00:00 EDT 2016},

  month        = {Sun May 01 00:00:00 EDT 2016}

}

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