High-coercivity SmFe12-based anisotropic sintered magnets by Cu addition
Source abstract
Abstract
We achieved a record-high coercivity of 1.40 T in a SmFe 12-based ThMn 12-type anisotropic sintered magnet. This magnet was prepared by sintering jet-milled powder made from strip-cast alloys with a nominal composition of Sm 8Fe 73.5Ti 8V 8Al 2Cu 0.5 , using the conventional process for anisotropic sintered magnet production. Detailed microstructural investigations conducted using scanning electron microscopy and transmission electron microscopy revealed that the formation of Fe-lean intergranular phases (with < 20 at.% of Fe) surrounding the fine SmFe 12 phase grains resulted in the high coercivity. Nanobeam electron diffraction patterns showed that these Fe-lean intergranular phases (IGPs) exhibiting excellent wettability in this magnet are mainly composed of two phases: a hexagonal close-packed Mg-type Sm-based phase and a primitive cubic CsCl-type SmCu-based phase, which co-exist in the same intergranular region. Such Fe-lean IGPs minimize the intergranular exchange coupling in the SmFe 12 main phase, which contributes to the high coercivity, as revealed by magneto-optical Kerr effect microscopy. Overall, this study provides detailed microstructure-coercivity correlations and insights for the future development of high-performance SmFe 12-based sintered magnets.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Magnetic Properties of Alloys · Magnetic properties of thin films · Hydrogen Storage and Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (36)
Show source-provided references
1. https://www.marketsandmarkets.com/Market-Reports/permanent-magnet-market-806.html.
2. https://www.marketsandmarkets.com/Market-Reports/permanent-magnet-motor-market-218887711.html.
3. https://www.virta.global/en/global-electric-vehicle-market.
4. https://www.transparencymarketresearch.com/permanent-magnet-generators-market.html.
5. R. W. McCallum, L. H. Lewis, R. Skomski, M. J. Kramer, and I. E. Anderson, Practical Aspects of Modern and Future Permanent Magnets Annual Review of Materials Research, 44 (2014), pp. 451–477, 10.1146/annurev-matsci-070813-113457.10.1146/annurev-matsci-070813-113457 ↗
6. J. M. D. Coey, Perspective and Prospects for Rare Earth Permanent Magnets Engineering, 6 (2020), pp. 119–131, 10.1016/j.eng.2018.11.034.10.1016/j.eng.2018.11.034 ↗
7. Magnetic properties of Fe-rich rare-earth intermetallic compounds with a ThMn12 structure10.1063/1.342235 ↗
8. Magnetic and structural properties of SmTiFe11-xCox alloys10.1016/0304-8853(88)90039-X ↗
9. Recent developments in RFe12-type compounds for permanent magnets10.1016/j.scriptamat.2017.10.033 ↗
10. Intrinsic hard magnetic properties of Sm(Fe1-xCox)12 compound with the ThMn12 structure10.1016/j.scriptamat.2017.05.029 ↗
11. Prospects for the development of SmFe12-based permanent magnets with a ThMn12-type phase10.1016/j.scriptamat.2020.113686 ↗
12. Micromagnetism-microstructure relations and the hysteresis loop
13. Strategy for high-coercivity Nd–Fe–B magnets10.1016/j.scriptamat.2012.06.038 ↗
14. High-coercivity ThMn12-type monocrystalline Sm–Zr–Fe–Co–Ti particles by high-temperature reduction diffusion10.1016/j.scriptamat.2021.113760 ↗
15. Grain boundary segregation, phase formation, and their influence on the coercivity of rapidly solidified SmFe11Ti hard magnetic alloys
16. Phase evolution of ThMn12-type Sm-Fe-Co-Ga-Ti alloys with annealing treatment10.1016/j.jallcom.2022.167604 ↗
17. Hono SmFe12-based hard magnetic alloys prepared by reduction-diffusion process10.1016/j.jallcom.2020.157993 ↗
18. Effects of Sm content on the phase structure, microstructure and magnetic properties of the SmxZr0.2(Fe0·8Co0.2)11.5Ti0.5 (x=0.8–1.4) alloys10.1016/j.jallcom.2020.154428 ↗
19. Development of ultra-fine grain sized SmFe12-based powders using hydrogenation disproportionation desorption recombination process10.1016/j.actamat.2018.11.065 ↗
20. Magnetic properties of SmFe12-based magnets produced by spark plasma sintering method10.1016/j.jallcom.2018.09.297 ↗
21. Role of V on the coercivity of SmFe12-based melt-spun ribbons revealed by machine learning and microstructure characterizations10.1016/j.scriptamat.2021.113925 ↗
22. Coercivities of Sm–Fe–M Sintered Magnets with ThMn12-Type Structure (M = Ti, V)10.2320/matertrans.MT-MBW2020003 ↗
23. Origin of coercivity in an anisotropic Sm(Fe,Ti,V)12-based sintered magnet10.1016/j.actamat.2021.117161 ↗
24. Microstructure and extrinsic magnetic properties of anisotropic Sm(Fe,Ti,V)12-based sintered magnets10.1016/j.actamat.2022.118228 ↗
25. Structures and magnetic properties of sintered Nd–Fe–B magnets produced by strip casting technique10.1016/S0304-8853(01)00654-0 ↗
26. Nanocrystalline Sm-based 1:12 magnets10.1016/j.actamat.2020.08.075 ↗
27. Emergence of coercivity in Sm(Fe0.8Co0.2)12 thin films via eutectic alloy grain boundary infiltration10.1016/j.scriptamat.2019.02.001 ↗
28. Angular dependence and thermal stability of coercivity of Nd-rich Ga-doped Nd–Fe–B sintered magnet10.1016/j.actamat.2020.01.035 ↗
29. Hono Formation of non-ferromagnetic grain boundary phase in a Ga-doped Nd-rich Nd–Fe–B sintered magnet10.1016/j.scriptamat.2015.10.042 ↗
30. On the temperature-dependent coercivities of anisotropic Nd-Fe-B magnet10.1016/j.actamat.2020.08.040 ↗
31. Sagawa Analysis of the magnetic hardening mechanism in RE-FeB permanent magnets10.1016/0304-8853(88)90202-8 ↗
32. The origin of coercivity decrease in fine grained Nd–Fe–B sintered magnets10.1016/j.jmmm.2008.10.032 ↗
33. https://mqitechnology.com/applications/automotive/.
34. https://product.tdk.com/en/products/magnet/index.html.
35. http://www.umag.com.cn/index.php?m=&c=Index&a=lists&catid=2.
36. Rare, earths and the balance problem: how to deal with changing markets10.1007/s40831-018-0162-8 ↗