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/content/aip/journal/adva/6/5/10.1063/1.4944073
2016-03-10
2016-09-25

Abstract

Nd-Fe-B-Ga-Nb magnetic powder was subjected to the dynamic hydrogen disproportionation desorption recombination treatment. For samples disproportionated at both 30 and 100 kPa of hydrogen pressure, the changes in the microstructure and grain orientation during recombination process were investigated. It was observed that even during the recombination process, the orientation relationship was maintained between α-Fe and NdH grains formed after the disproportionation treatment at 30 kPa of hydrogen pressure, [110]α-Fe // [110]NdH, (-110)α-Fe // (-220)NdH. Additionally, the alignment of recombined NdFeBH grains became clear after 30 min of DR treatment showing following orientation relationship: (001)NdFeBH // (110)α-Fe and (110)NdH. In contrast, such a relationship was not observed in the sample disproportionated at 100 kPa of hydrogen pressure. This difference in the degree of alignment was also confirmed by measuring the magnetic property of the respective samples.

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