Crystallographic alignment in the recombination stage in d -HDDR process of Nd-Fe-B-Ga-Nb powders

Takashi Horikawa; Masashi Matsuura; Satoshi Sugimoto; Masao Yamazaki; Chisato Mishima

doi:10.1063/1.4944073

Crystallographic alignment in the recombination stage in d -HDDR process of Nd-Fe-B-Ga-Nb powders

Takashi Horikawa, Masashi Matsuura, Satoshi Sugimoto, Masao Yamazaki, Chisato Mishima

ENG - Materials Science

Aichi Steel Corporation

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

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_2+x grains formed after the disproportionation treatment at 30 kPa of hydrogen pressure, [110]α-Fe // [110]NdH_2+x, (-110)α-Fe // (-220)NdH_2+x. Additionally, the alignment of recombined Nd₂Fe₁₄BH_y grains became clear after 30 min of DR treatment showing following orientation relationship: (001)Nd₂Fe₁₄BH_y // (110)α-Fe and (110)NdH_2+x. 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.

Original language	English
Article number	056017
Journal	AIP Advances
Volume	6
Issue number	5
DOIs	https://doi.org/10.1063/1.4944073
Publication status	Published - 2016 May 1

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title = "Crystallographic alignment in the recombination stage in d -HDDR process of Nd-Fe-B-Ga-Nb powders",

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 NdH2+x grains formed after the disproportionation treatment at 30 kPa of hydrogen pressure, [110]α-Fe // [110]NdH2+x, (-110)α-Fe // (-220)NdH2+x. Additionally, the alignment of recombined Nd2Fe14BHy grains became clear after 30 min of DR treatment showing following orientation relationship: (001)Nd2Fe14BHy // (110)α-Fe and (110)NdH2+x. 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.",

author = "Takashi Horikawa and Masashi Matsuura and Satoshi Sugimoto and Masao Yamazaki and Chisato Mishima",

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T1 - Crystallographic alignment in the recombination stage in d -HDDR process of Nd-Fe-B-Ga-Nb powders

AU - Horikawa, Takashi

AU - Matsuura, Masashi

AU - Sugimoto, Satoshi

AU - Yamazaki, Masao

AU - Mishima, Chisato

PY - 2016/5/1

Y1 - 2016/5/1

N2 - 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 NdH2+x grains formed after the disproportionation treatment at 30 kPa of hydrogen pressure, [110]α-Fe // [110]NdH2+x, (-110)α-Fe // (-220)NdH2+x. Additionally, the alignment of recombined Nd2Fe14BHy grains became clear after 30 min of DR treatment showing following orientation relationship: (001)Nd2Fe14BHy // (110)α-Fe and (110)NdH2+x. 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.

AB - 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 NdH2+x grains formed after the disproportionation treatment at 30 kPa of hydrogen pressure, [110]α-Fe // [110]NdH2+x, (-110)α-Fe // (-220)NdH2+x. Additionally, the alignment of recombined Nd2Fe14BHy grains became clear after 30 min of DR treatment showing following orientation relationship: (001)Nd2Fe14BHy // (110)α-Fe and (110)NdH2+x. 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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Crystallographic alignment in the recombination stage in d -HDDR process of Nd-Fe-B-Ga-Nb powders

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