Anisotropy inducement mechanism in hydrogen disproportionation desorption recombination (HDDR) processed Nd-Fe-B powders

摘要

The hydrogenation-disproportionation-desorption-recombination (HDDR) process is an attractive and unique method for producing anisotropic nanocrystalline Nd-Fe-B powders. In order to develop highly textured Nd-Fe-B powders, HDDR process parameters need to be carefully chosen and controlled. Although lots of investigations have been carried out to understand the mechanism of the anisotropy development in HDDR powders, some questions still remain. In this work, the microstructures of Nd-Fe-B powders that were HD processed at different hydrogen pressure (P_(H2)~(HD)) were investigated to fully clarify the mechanism of the anisotropic microstructure evolution.