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Title: Texture development and coercivity enhancement in cast alnico 9 magnets

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.

Authors:
 [1]; ORCiD logo [1];  [1]; ORCiD logo [1];  [1]; ORCiD logo [2];  [2];  [2];  [1];  [1]
  1. Univ. of Nebraska, Lincoln, NE (United States)
  2. Ames Lab., Ames, IA (United States)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1556932
Alternate Identifier(s):
OSTI ID: 1414985
Report Number(s):
IS-J-9633
Journal ID: ISSN 2158-3226
Grant/Contract Number:  
under Award ECCS: 1542182; AC02-07CH11358
Resource Type:
Accepted Manuscript
Journal Name:
AIP Advances
Additional Journal Information:
Journal Volume: 8; Journal Issue: 5; Journal ID: ISSN 2158-3226
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Zhang, Wenyong, Valloppilly, Shah, Li, Xingzhong, Yue, Lanping, Skomski, Ralph, Anderson, Iver, Kramer, Matthew, Tang, Wei, Shield, Jeff, and Sellmyer, David J. Texture development and coercivity enhancement in cast alnico 9 magnets. United States: N. p., 2017. Web. doi: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. United States. doi:10.1063/1.5007171.
Zhang, Wenyong, Valloppilly, Shah, Li, Xingzhong, Yue, Lanping, Skomski, Ralph, Anderson, Iver, Kramer, Matthew, Tang, Wei, Shield, Jeff, and Sellmyer, David J. Wed . "Texture development and coercivity enhancement in cast alnico 9 magnets". United States. doi:10.1063/1.5007171. https://www.osti.gov/servlets/purl/1556932.
@article{osti_1556932,
title = {Texture development and coercivity enhancement in cast alnico 9 magnets},
author = {Zhang, Wenyong and Valloppilly, Shah and Li, Xingzhong and Yue, Lanping and Skomski, Ralph and Anderson, Iver and Kramer, Matthew and Tang, Wei and Shield, Jeff and Sellmyer, David J.},
abstractNote = {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.},
doi = {10.1063/1.5007171},
journal = {AIP Advances},
number = 5,
volume = 8,
place = {United States},
year = {2017},
month = {12}
}

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