High synergy of coercivity and thermal stability in resource-saving Nd-Ce-Y-Fe-B melt-spun ribbons
| Autor: | Xiao-Wei Wu, Mi Yan, W. Chen, Tao Yongming, Xiaoling Peng, Jiaying Jin |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Mechanical Engineering Metals and Alloys Thermodynamics 02 engineering and technology Coercivity 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Grain growth Mechanics of Materials Remanence Magnet Lattice (order) Materials Chemistry Thermal stability Grain boundary 0210 nano-technology Temperature coefficient |
| Zdroj: | Journal of Alloys and Compounds. 882:160731 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2021.160731 |
| Popis: | Motivated by the global rare earth (RE) criticality, the utilization of abundant Ce and Y has attracted tremendous interests in the Nd-Fe-B community. Although the Y substitution can enhance the thermal stability of Nd-Ce-Fe-B magnet, the room-temperature coercivity is lowered drastically, which remains a challenging hurdle. Considering the equivalent intrinsic HA between Ce2Fe14B and Y2Fe14B compound, there is an intriguing possibility of achieving the balanced contributions from Y substitution on the improved coercivity and thermal stability of Nd-Ce-Y-Fe-B magnets simultaneously. Inspired by this possibility, a series of [Nd0.5(Ce1-xYx)0.5]30.5Fe68.5B1.0 melt-spun ribbons (x = 0–0.5, wt%) are prepared through adjusting the Ce/Y ratio in present work. Results show that maximized room-temperature coercivity Hcj of 12.0 ~12.2 kOe, together with preferable temperature coefficient α of −0.17 ~ −0.16%/K and β of −0.37 ~ −0.35%/K within 293–393 K interval are acquired at the optimal Y content (x = 0.1 and 0.2). Above outstanding combination of coercivity and thermal stability are the highest values reported so far upon 50 wt% Ce-Y substitution for Nd, which is ascribed to the intrinsic contribution from Y replacement for Ce in 2:14:1 lattice, as well as the microstructural advantages from refined RE2Fe14B grain and continuous RE-rich grain boundary layer. However, excessive Y substitution leads to dramatic grain growth and weakened exchanging coupling effect, drastically deteriorating the coercivity and remanence, despite the fact that both α and β are continually improved. Above findings shed new light on developing resource-saving Nd-Ce-Y-Fe-B permanent magnets with high synergy of coercivity and thermal stability. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect