NDLI: The magnetic and mechanical properties of NdFeB type permanent magnets and the effect of quenching

Content Provider	IEEE Xplore Digital Library
Author	Withey, P.A. Kennett, H.M. Bowen, P. Harris, I.R.
Copyright Year	1965
Abstract	The fracture strength of Nd/sub 15/Fe/sub 77/B/sub 8/ and Nd/sub 14.5/Dy/sub 1.5/Nb/sub 1/Fe/sub 76/B/sub 7/ sintered magnets has been measured to be 285(40) MPa and 240(48) MPa, respectively. The fracture mechanism appears to be controlled by a critical level of tensile stress. In all the cases considered, Nd-Fe-B-type permanent magnets have been shown to fracture in a brittle manner along the grain boundaries. This is consistent with poor adhesion between Nd/sub 2/Fe/sub 14/B grains and could be due to the lack of the neodymium-rich phase along certain interfaces even in the fully sintered condition. The addition of dysprosium and niobium to the Nd-Fe-B alloy did not alter the fracture behavior of the material, whereas these additions have a marked effect on the magnetic properties. Quenching from 1370 K was found to greatly affect the fracture stress. This is possibly due to rapid cooling through the melting point of the neodymium-rich phase, which prevents sufficient wetting of the grains. Indeed, when the quench rate was increased the effect was so severe that some samples were prone to fail on pulse magnetization. However, where this did not occur, the effect was reversible on annealing at 903 K for 1 h. The intrinsic coercivity decreased progressively with increasing quench temperature above 900 K. This could be due to progressively less wetting with increasing quench temperature.<>
Sponsorship	IEEE Magnetics Society
Starting Page	2619
Ending Page	2621
Page Count	3
File Size	419428
File Format	PDF
ISSN	00189464
Volume Number	26
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1990-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Mechanical factors Neodymium Iron Niobium Magnetic materials Temperature Stress control Tensile stress Permanent magnets Grain boundaries
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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