Effect of hydrogenation disproportionation conditions on magnetic anisotropy in Nd-Fe-B powder prepared by dynamic hydrogenation disproportionation desorption recombination
Various anisotropic Nd-Fe-B magnetic powders were prepared by the dynamic hydrogenation disproportionation desorption recombination (d-HDDR) treatment with different hydrogenation disproportionation (HD) times (tHD). The resulting magnetic properties and microstructural changes were investigated. Th...
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| Format: | Article |
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AIP Publishing LLC
2017-05-01
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| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/1.4975697 |
| _version_ | 1828542017468104704 |
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| author | Masao Yamazaki Takashi Horikawa Chisato Mishima Masashi Matsuura Nobuki Tezuka Satoshi Sugimoto |
| author_facet | Masao Yamazaki Takashi Horikawa Chisato Mishima Masashi Matsuura Nobuki Tezuka Satoshi Sugimoto |
| author_sort | Masao Yamazaki |
| collection | DOAJ |
| description | Various anisotropic Nd-Fe-B magnetic powders were prepared by the dynamic hydrogenation disproportionation desorption recombination (d-HDDR) treatment with different hydrogenation disproportionation (HD) times (tHD). The resulting magnetic properties and microstructural changes were investigated. The magnetic anisotropy was decreased with increasing tHD. In the d-HDDR powders with higher magnetic anisotropy, fine (200–600 nm) and coarse (600–1200 nm) Nd2Fe14B grains were observed. The coarse Nd2Fe14B grains showed highly crystallographic alignment of the c-axis than fine Nd2Fe14B grains. In the highly anisotropic Nd2Fe14B d-HDDR powder, a large area fraction of lamellar-like structures consisting of NdH2 and α-Fe were observed after HD treatment. Furthermore, the mean diameter of the lamellar-like regions, where lamellar-like structures orientate to the same direction in the HD-treated alloys was close to that of coarse Nd2Fe14B grains after d-HDDR treatment. Thus, the lamellar-like regions were converted into the crystallographically aligned coarse Nd2Fe14B grains during desorption recombination treatment, and magnetic anisotropy is closely related to the volume fraction of lamellar-like regions observed after HD treatment. |
| first_indexed | 2024-12-12T01:50:01Z |
| format | Article |
| id | doaj.art-0ee728f831ee4442ac5f37834fff663a |
| institution | Directory Open Access Journal |
| issn | 2158-3226 |
| language | English |
| last_indexed | 2024-12-12T01:50:01Z |
| publishDate | 2017-05-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj.art-0ee728f831ee4442ac5f37834fff663a2022-12-22T00:42:31ZengAIP Publishing LLCAIP Advances2158-32262017-05-0175056220056220-810.1063/1.4975697205791ADVEffect of hydrogenation disproportionation conditions on magnetic anisotropy in Nd-Fe-B powder prepared by dynamic hydrogenation disproportionation desorption recombinationMasao Yamazaki0Takashi Horikawa1Chisato Mishima2Masashi Matsuura3Nobuki Tezuka4Satoshi Sugimoto5Department of Materials Science, Graduate School of Engineering, Tohoku University, Sendai, Miyagi 980-8579, JapanDepartment of Materials Science, Graduate School of Engineering, Tohoku University, Sendai, Miyagi 980-8579, JapanAichi Steel Corporation, Tokai, Aichi 476-8666, JapanDepartment of Materials Science, Graduate School of Engineering, Tohoku University, Sendai, Miyagi 980-8579, JapanDepartment of Materials Science, Graduate School of Engineering, Tohoku University, Sendai, Miyagi 980-8579, JapanDepartment of Materials Science, Graduate School of Engineering, Tohoku University, Sendai, Miyagi 980-8579, JapanVarious anisotropic Nd-Fe-B magnetic powders were prepared by the dynamic hydrogenation disproportionation desorption recombination (d-HDDR) treatment with different hydrogenation disproportionation (HD) times (tHD). The resulting magnetic properties and microstructural changes were investigated. The magnetic anisotropy was decreased with increasing tHD. In the d-HDDR powders with higher magnetic anisotropy, fine (200–600 nm) and coarse (600–1200 nm) Nd2Fe14B grains were observed. The coarse Nd2Fe14B grains showed highly crystallographic alignment of the c-axis than fine Nd2Fe14B grains. In the highly anisotropic Nd2Fe14B d-HDDR powder, a large area fraction of lamellar-like structures consisting of NdH2 and α-Fe were observed after HD treatment. Furthermore, the mean diameter of the lamellar-like regions, where lamellar-like structures orientate to the same direction in the HD-treated alloys was close to that of coarse Nd2Fe14B grains after d-HDDR treatment. Thus, the lamellar-like regions were converted into the crystallographically aligned coarse Nd2Fe14B grains during desorption recombination treatment, and magnetic anisotropy is closely related to the volume fraction of lamellar-like regions observed after HD treatment.http://dx.doi.org/10.1063/1.4975697 |
| spellingShingle | Masao Yamazaki Takashi Horikawa Chisato Mishima Masashi Matsuura Nobuki Tezuka Satoshi Sugimoto Effect of hydrogenation disproportionation conditions on magnetic anisotropy in Nd-Fe-B powder prepared by dynamic hydrogenation disproportionation desorption recombination AIP Advances |
| title | Effect of hydrogenation disproportionation conditions on magnetic anisotropy in Nd-Fe-B powder prepared by dynamic hydrogenation disproportionation desorption recombination |
| title_full | Effect of hydrogenation disproportionation conditions on magnetic anisotropy in Nd-Fe-B powder prepared by dynamic hydrogenation disproportionation desorption recombination |
| title_fullStr | Effect of hydrogenation disproportionation conditions on magnetic anisotropy in Nd-Fe-B powder prepared by dynamic hydrogenation disproportionation desorption recombination |
| title_full_unstemmed | Effect of hydrogenation disproportionation conditions on magnetic anisotropy in Nd-Fe-B powder prepared by dynamic hydrogenation disproportionation desorption recombination |
| title_short | Effect of hydrogenation disproportionation conditions on magnetic anisotropy in Nd-Fe-B powder prepared by dynamic hydrogenation disproportionation desorption recombination |
| title_sort | effect of hydrogenation disproportionation conditions on magnetic anisotropy in nd fe b powder prepared by dynamic hydrogenation disproportionation desorption recombination |
| url | http://dx.doi.org/10.1063/1.4975697 |
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