Microstructure and Hard Magnetic Properties of Sm1-xZrx(Fe,Co)11.3-yTi0.7By Ingots and Thick Melt-Spun Ribbons

Gabay, Alexander M.; Hadjipanayis, George C.

doi:10.1109/tmag.2021.3102513

Title: Microstructure and Hard Magnetic Properties of Sm_1-xZr_x(Fe,Co)_11.3-yTi_0.7By Ingots and Thick Melt-Spun Ribbons

Abstract

Permanent magnets made from Sm(Fe,Co)₁₂-based compounds are being actively pursued through nanostructuring and powder metallurgy. This study was aimed at the development of hard magnetic properties in bulk as-cast alloys and in melt-spun alloys for very low wheel speeds. Slower solidification rates and alloying with Zr promote the tetragonal ThMn₁₂-type crystal structure, whereas higher solidification rates and alloying with B replace the ThMn₁₂ structure type with the TbCu₇ structure type. When introduced simultaneously, Zr and B dramatically reduce the alloy solidification rates required for both the refinement of the 1:12 crystallites and their replacement with the 1:7 phase. In bulk arc-melted alloys, this allowed for a microstructure of separated 1:12 crystallites 1–3 μm in size, although, because of the ferromagnetic nature of a minority phase, the coercivity of these fine-grained alloys reached only 0.73 kOe. A moderately accelerated solidification further refined the 1:12 crystallites and increased the coercivity; a Sm_0.7Zr_0.4(Fe,Co)_10.8Ti_0.7B_0.5 alloy exhibited a coercivity of 1.5 kOe and a maximum energy product of 3.4 MGOe when it was melt-spun into a 0.26-mm-thick ribbon. A more rapid solidification suppressed the 1:12 phase and after annealing at 800–850 °C, the alloys modified with Zr and B developed reasonably high coercivity and maximummore »« less

Authors:

Gabay, Alexander M. ^[1]; Hadjipanayis, George C. ^[1]

Univ. of Delaware, Newark, DE (United States)

Publication Date:: Tue Aug 03 00:00:00 EDT 2021

Research Org.:: Univ. of Delaware, Newark, DE (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1812306

Grant/Contract Number:: FG02-90ER45413

Resource Type:: Accepted Manuscript

Journal Name:: IEEE Transactions on Magnetics

Additional Journal Information:: Journal Volume: 58; Journal Issue: 2; Conference: Intermag 2021, Lyon (Held Virtually) (France), 26-30 Apr 2021; Journal ID: ISSN 0018-9464

Publisher:: Institute of Electrical and Electronics Engineers. Magnetics Group

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; coercivity; melt-spinning; rare-earth magnets; ThMn12

Citation Formats


                    Gabay, Alexander M., and Hadjipanayis, George C. Microstructure and Hard Magnetic Properties of Sm1-xZrx(Fe,Co)11.3-yTi0.7By Ingots and Thick Melt-Spun Ribbons.  United States: N. p., 2021. 
Web.  doi:10.1109/tmag.2021.3102513.

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                    Gabay, Alexander M., & Hadjipanayis, George C. Microstructure and Hard Magnetic Properties of Sm1-xZrx(Fe,Co)11.3-yTi0.7By Ingots and Thick Melt-Spun Ribbons.  United States.  https://doi.org/10.1109/tmag.2021.3102513

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                    Gabay, Alexander M., and Hadjipanayis, George C. Tue .  
"Microstructure and Hard Magnetic Properties of Sm1-xZrx(Fe,Co)11.3-yTi0.7By Ingots and Thick Melt-Spun Ribbons".  United States.  https://doi.org/10.1109/tmag.2021.3102513.  https://www.osti.gov/servlets/purl/1812306.

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@article{osti_1812306,

  title        = {Microstructure and Hard Magnetic Properties of Sm1-xZrx(Fe,Co)11.3-yTi0.7By Ingots and Thick Melt-Spun Ribbons},

  author       = {Gabay, Alexander M. and Hadjipanayis, George C.},

  abstractNote = {Permanent magnets made from Sm(Fe,Co)12-based compounds are being actively pursued through nanostructuring and powder metallurgy. This study was aimed at the development of hard magnetic properties in bulk as-cast alloys and in melt-spun alloys for very low wheel speeds. Slower solidification rates and alloying with Zr promote the tetragonal ThMn12-type crystal structure, whereas higher solidification rates and alloying with B replace the ThMn12 structure type with the TbCu7 structure type. When introduced simultaneously, Zr and B dramatically reduce the alloy solidification rates required for both the refinement of the 1:12 crystallites and their replacement with the 1:7 phase. In bulk arc-melted alloys, this allowed for a microstructure of separated 1:12 crystallites 1–3 μm in size, although, because of the ferromagnetic nature of a minority phase, the coercivity of these fine-grained alloys reached only 0.73 kOe. A moderately accelerated solidification further refined the 1:12 crystallites and increased the coercivity; a Sm0.7Zr0.4(Fe,Co)10.8Ti0.7B0.5 alloy exhibited a coercivity of 1.5 kOe and a maximum energy product of 3.4 MGOe when it was melt-spun into a 0.26-mm-thick ribbon. A more rapid solidification suppressed the 1:12 phase and after annealing at 800–850 °C, the alloys modified with Zr and B developed reasonably high coercivity and maximum energy product even when melt-spun at a wheel speed of 6 m/s. For the above-mentioned alloy, these values were 4.1 kOe and 7.8 MGOe, respectively. Further, a similarly processed very-Sm-lean Sm0.5Zr0.6(Fe,Co)10.6Ti0.7B0.7 alloy exhibited a remanence of 8.8 kG and an energy product of 7.4 MGOe.},

  doi          = {10.1109/tmag.2021.3102513},

  journal      = {IEEE Transactions on Magnetics},

  number       = 2,

  volume       = 58,

  place        = {United States},

  year         = {Tue Aug 03 00:00:00 EDT 2021},

  month        = {Tue Aug 03 00:00:00 EDT 2021}

}

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Abstract

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