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HomeDefect and Diffusion ForumDefect and Diffusion Forum Vol. 380Grain Boundary Wetting in the Nd-Fe-B-Based Alloy

Grain Boundary Wetting in the Nd-Fe-B-Based Alloy

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Abstract:

The microstructure of Nd–Fe–B-based liquid-phase sintered alloy has been studied. The Nd₂Fe₁₄B/Nd₂Fe₁₄B GBs can be pseudo-incompletely (or pseudo-partially) wetted by the Nd-rich melt. Such GBs form the non-zero contact angle with the melt in the triple junctions and contain the uniformly thin (7-10 nm) Nd-rich layer. Such GBs are different from the completely wetted as well as from partially wetted GBs. Most probably, such thin Nd-rich GB layers are responsible for the excellent magnetic properties of the NdFeB-base permanent magnets because these GB layers ensure the magnetic isolation between the Nd₂Fe₁₄B grains needed for the high coercivity.

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Defect and Diffusion Forum (Volume 380)

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173-180

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https://doi.org/10.4028/www.scientific.net/DDF.380.173

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November 2017

Authors:

Andrey Mazilkin*, Boris Straumal, Svetlana Protasova, Brigitte Baretzky

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Grain Boundaries, Nd-Fe-B Alloys, Wetting

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