NDLI: Effect of Grain Size and Die-Upset Temperature on Texture in Die-Upset Nd-Fe-B Magnet

Content Provider	IEEE Xplore Digital Library
Author	Hae-woong Kwon Kang, Y.S. Choi, G.S. Yu, J.H.
Copyright Year	1965
Abstract	Hot-pressed Nd_13.5Fe₇₇Si₁B₈ alloy compacts with various grain sizes ranging from approximately 50 nm to 200 nm were prepared using melt-spun material. The compacts were then subjected to die-upsetting. The effect of grain size in the hot-pressed compact on the texture in die-upset magnet was investigated. The effect of die-upset temperature on the texture in die-upset magnet was also investigated. Texture in the die-upset Nd_13.5Fe₇₇Si₁B₈ alloy samples decreased with increasing the grain size in the hot-pressed compact before the die-upsetting. This dependence of texture on the initial grain size could be explained by the unique texture formation mechanism of a stress-induced preferential grain growth via dissolution and precipitation. Texture of the die-upset sample was also influenced by the die-upsetting temperature. The samples die-upset at 700degC and 900degC had poorer texture compared to the samples die-upset at the temperature range of 750degC-850degC. The poor texture in the sample die-upset at lower temperature of 700degC was attributed to the less dissolution of the unfavorable Nd₂Fe₁₄B grains and low fluidity of the liquid Nd-rich grain boundary phase. The poor texture in the sample die-upset at higher temperature of 900degC was explained by the reduced elastic modulus and the excessive grain growth of the Nd₂Fe₁₄B grains.
Sponsorship	IEEE Magnetics Society
Starting Page	2590
Ending Page	2593
Page Count	4
File Size	1677770
File Format	PDF
ISSN	00189464
Volume Number	45
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Grain size Magnetic materials Temperature distribution Demagnetization Permanent magnets Remanence Powders Materials science and technology Grain boundaries Magnetoelasticity permanent magnets Hard magnetic materials magnetic materials magnets
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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