首页|Tailoring the magnetic properties and microstructure of Alnico 8 magnets by various Ti contents and processing conditions

Tailoring the magnetic properties and microstructure of Alnico 8 magnets by various Ti contents and processing conditions

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  • NSTL
  • Elsevier
? 2022 Elsevier LtdShape anisotropy, developed as a result of spinodal decomposition (SD) is the basis for the hysteresis behavior of Alnico magnets. The SD process is sensitive to processing conditions and constituent elements. In this paper, the development of spinodal structure and its effects on magnetic properties and serviceability of Alnico 8 alloys are investigated. The Ti-content is varied between 2.5 and 7.5 wt%. The magnets are fabricated by conventional casting, homogenization, magnetic field annealing and tempering treatments. The magnetic properties of intrinsic coercivity, Hcj = 30 kA/m, remanence, Br = 0.53 T and maximum energy density, (BH)max = 6.03 kJ/m3 for 2.5 wt% Ti are increased to Hcj = 150 kA/m, Br = 0.0.88 T and (BH)max = 29.3 kJ/m3 for 6.5 wt% Ti alloy. These magnetic properties are 100% reversible up to 800 K. Furthermore, an alloy with 5.5 wt% Ti is directionally solidified and magnetic properties of Br = 1.01 T and (BH)max = 58.9 kJ/m3 are obtained. The evolution of mosaic nano structure, the mechanism of magnetic hardening and the interactions of various phases have been investigated.

Ferromagnetic phaseInteraction mechanismMagnetic propertiesPermanent magnets

Rehman S.U.、Liu H.、Li S.、Minglong Z.、Yang M.、Jiang Q.、Zhong Z.、Zhang R.、Wei C.、Wang J.

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Jiangxi Key Laboratory for Rare Earth Magnetic Materials and Devices College of Rare Earths Jiangxi University of Science and Technology

Zhejiang Tiantong Electronic Information Materials Research Institute Co Ltd

State Key Laboratory of Solidification Processing Northwestern Polytechnical University

2022

10.1016/j.intermet.2022.107486

Intermetallics

Intermetallics

EISCI
ISSN：0966-9795
年,卷(期)：2022.143
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