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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