E-resources
Peer reviewed
-
Zhang, Yong; Chai, Kangjie; Wu, Weisong; Wu, Pengfei; Yang, Qiankun; Han, Liuliu; Gan, Kefu; Yan, Dingshun; Li, Zhiming
Journal of materials science & technology, 03/2025, Volume: 211Journal Article
•Continuous GBPs turn into discrete upon the angle between {0001} planes and GB increases from 0 to 90°, which is owing to the strong texture.•The larger angle between {0001} planes and GBs, the more {0001} diffusion channels for atoms to GBs, resulting in discrete and thick GBPs.•Both the GBPs thickness and PFZs width increase linearly by a factor of 2.5–4.•GBPs are alternatively stacked Cu-rich SmCo5 and Zr-rich Smn+1Co5n−1 (n = 2,3,4) compounds, and the PFZs are composed of 2:17R and intermediate 2:17R’ phases.•PFZs are weak pinning sites for magnetic domain walls as revealed by in-situ Lorentz TEM. In a typical sintered multi-component Sm2Co17-type magnet with strong fiber texture, we show that the distributions of grain boundary precipitates (GBPs) are heavily dependent on the grain boundary (GB) geometry with respect to the texture direction, which has significant effects on domain wall pinning. Results demonstrate that the continuous GBPs turn into discrete upon the angle between {0001} planes and GB increases from 0° to 90°, meanwhile the GBPs thickness and precipitation free zones (PFZs) width both increase linearly by a factor of 2.5–4. Transmission electron microscopy (TEM) reveals that the GBPs are alternatively stacked Cu-rich SmCo5 and Zr-rich Smn+1Co5n−1 (n = 2,3,4) compounds, while the PFZs are composed of 2:17R and intermediate 2:17R’ phases. Atomic-level elemental mappings and first-principles calculations indicate that Cu exists at the Co-2c site in the SmCo5 forming SmCo3Cu2 and Zr locates at the dumbbell Sm-6c sites in the Smn+1Co5n−1. The symbiotic GBPs have orientation relationships of 0001GBPs//00012:17R and 101¯0GBPs//21¯1¯02:17R. The formation of anisotropic GBPs is owing to the strong fiber texture, i.e., the larger angle between {0001} planes and GBs, the more {0001} diffusion channels for atoms to GBs, resulting in discrete and thick GBPs. In-situ Lorentz TEM shows that the domain walls interrupted by GBPs migrate easily under applied magnetic fields. Possible approaches to enhance the magnetic hardness via tuning the GBs are proposed. Display omitted
Author
Shelf entry
Permalink
- URL:
Impact factor
Access to the JCR database is permitted only to users from Slovenia. Your current IP address is not on the list of IP addresses with access permission, and authentication with the relevant AAI accout is required.
Year | Impact factor | Edition | Category | Classification | ||||
---|---|---|---|---|---|---|---|---|
JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
Select the library membership card:
If the library membership card is not in the list,
add a new one.
DRS, in which the journal is indexed
Database name | Field | Year |
---|
Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
---|
Source: Personal bibliographies
and: SICRIS
The material is available in full text. If you wish to order the material anyway, click the Continue button.