Intermediate phases in the hydrogen disproportionated state of NdFeB-type powders

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Transmission electron microscopy studies have been carried out on partially disproportionated NdFeB-type alloys. A new intermediate magnetic (NIM) phase has been identified. Moreover, the lamella structure which subsequently develops from the tetragonal NIM phase comprises a tetragonal NdFe-containing (IL) phase and alpha -Fe. The experimental data show strong evidence of a well-defined crystallographic relation between both the NIM and lamella phases and between the IL phase and alpha -Fe. These observations give insight into how crystallographic texture, and hence anisotropy, can be developed in NdFeB-type powders processed by the hydrogenation, disproportionation, desorption, and recombination route. (C) 2001 American Institute of Physics.


Original languageEnglish
Pages (from-to)1924-1927
Number of pages4
JournalJournal of Applied Physics
Issue number4
Publication statusPublished - 1 Jan 2001