Texture development and coercivity enhancement in cast alnico 9 magnets

Wenyong Zhang, Shah Valloppilly, Xingzhong Li, Lanping Yue, Ralph Skomski, Iver Anderson, Matthew Kramer, Wei Tang, Jeff Shield, David J. Sellmyer

Research output: Contribution to journalArticle

Abstract

The effect of Y addition and magnetic field on texture and magnetic properties of arc-melted alnico 9 magnets has been investigated. Small additions of Y (1.5 wt.%) develop a (200) texture for the arc-melted alnico 9 magnet. Such a texture is hard to form in cast samples. To achieve this goal, we set up a high-field annealing system with a maximum operation temperature of 1250 °C. This system enabled annealing in a field of 45 kOe with subsequent draw annealing for the solutionized buttons; we have been able to substantially increase remanence ratio and coercivity, from 0.70 and 1200 Oe for the Y-free alnico 9 to 0.90 and 1400 Oe for the Y-doped alnico 9, respectively. A high energy product of 7.3 MGOe has been achieved for the fully heat-treated Y-doped alnico 9. The enhancement of coercivity is believed to arise from the introduction of magnetocrystalline anisotropy from 80 nm Y2Co17-type grains, which are exchange-coupled to the main-phase alnico rods.

Original languageEnglish (US)
Article number056215
JournalAIP Advances
Volume8
Issue number5
DOIs
StatePublished - May 1 2018

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coercivity
casts
magnets
textures
annealing
augmentation
arcs
buttons
remanence
rods
magnetic properties
heat
anisotropy
products
magnetic fields
temperature
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Zhang, W., Valloppilly, S., Li, X., Yue, L., Skomski, R., Anderson, I., ... Sellmyer, D. J. (2018). Texture development and coercivity enhancement in cast alnico 9 magnets. AIP Advances, 8(5), [056215]. https://doi.org/10.1063/1.5007171

Texture development and coercivity enhancement in cast alnico 9 magnets. / Zhang, Wenyong; Valloppilly, Shah; Li, Xingzhong; Yue, Lanping; Skomski, Ralph; Anderson, Iver; Kramer, Matthew; Tang, Wei; Shield, Jeff; Sellmyer, David J.

In: AIP Advances, Vol. 8, No. 5, 056215, 01.05.2018.

Research output: Contribution to journalArticle

Zhang, W, Valloppilly, S, Li, X, Yue, L, Skomski, R, Anderson, I, Kramer, M, Tang, W, Shield, J & Sellmyer, DJ 2018, 'Texture development and coercivity enhancement in cast alnico 9 magnets', AIP Advances, vol. 8, no. 5, 056215. https://doi.org/10.1063/1.5007171
Zhang W, Valloppilly S, Li X, Yue L, Skomski R, Anderson I et al. Texture development and coercivity enhancement in cast alnico 9 magnets. AIP Advances. 2018 May 1;8(5). 056215. https://doi.org/10.1063/1.5007171
Zhang, Wenyong ; Valloppilly, Shah ; Li, Xingzhong ; Yue, Lanping ; Skomski, Ralph ; Anderson, Iver ; Kramer, Matthew ; Tang, Wei ; Shield, Jeff ; Sellmyer, David J. / Texture development and coercivity enhancement in cast alnico 9 magnets. In: AIP Advances. 2018 ; Vol. 8, No. 5.
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