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C543 process is known as a method of synthesizing homogeneous Nd2Fe14B single phase powders [2]. In the HDDR process, Nd2Fe14B grains disproportionate into a mixture of α-Fe, NdH2 and Fe2B by hydrogenation under high temperature hydrogen atmosphere. The subsequent desorption of hydrogen results in the recombination of the Nd2Fe14B sub-micron grains. On the other hand, nano-structurization and hydrogenation of the Nd-Fe-B alloys by reactive mechanical milling have been successfully performed [3, 4], therefore, the synthesis of the nano-structure is expected to be fulfilled by the reactive mechanical milling [5]. In this work, we aim to synthesize Nd-Fe-B nanocomposite structure by the reactive mechanical milling process in a nanocomposite composition. As a result of reactive mechanical milling, the Nd2Fe14B grains result in a mixture of α-Fe, NdH2 and amorphous, and the FWHM of the α-Fe and NdH2 peaks were found to be in inverse proportional to the milling time. The change of the FWHM suggests that grains were refined by reactive mechanical milling. For this reason, it is expected that a nanostructure Nd-Fe-B powders will be obtained after recombination of the α-Fe and NdH2 grains by a subsequent heat treatment. Detailed relationships among the microstructure, mechanical milling conditions, heat treatments and magnetic properties of the nanocomposites will be discussed at the symposium.

Structural biology of TIM proteins: a family of cell surface phosphatidylserine receptors that regulate immunity