Effect of melt-spinning speed on the microstructure and magnetic properties of Al–Cu–Fe alloy-doped SmCo5 ribbons

• Published in: Applied physics. A, Materials science & processing Vol. 127; no. 3
• Main Authors: Wang, Li-Zhu, Wang, Shu, Zhang, Zhi-Ying, Wang, Hong-Wei, Sun, Ji-Bing, Cui, Chun-Xiang
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.03.2021; Springer Nature B.V
• Subjects: Applied physics; Characterization and Evaluation of Materials; Coercivity; Condensed Matter Physics; Cooling rate; Copper; Copper base alloys; Eutectic alloys; Grain boundaries; Iron; Machines; Magnetic properties; Magnetism; Manufacturing; Materials science; Melt spinning; Microstructure; Nanotechnology; Optical and Electronic Materials; Phases; Physics; Physics and Astronomy; Processes; Remanence; Samarium base alloys; Solidification; Surfaces and Interfaces; Thin Films; Melt-spinning; Sm-Co; Microstructure; Permanent magnetic material; Magnetic properties
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-021-04359-2

Multielement alloy doping is the feature of this paper, and disclosing the relationship between non-equilibrium microstructure and magnetic properties after rapid cooling is the key point. 3 wt% eutectic Al 82.8 Cu 17 Fe 0.2 alloy was doped into SmCo 5 alloy, followed by melt-spinning at 10–40 m/s. It is found all ribbons are composed of Sm(Co, M) 5 and Sm 2 (Co, M) 7 phases, but non-equilibrium solidification at different cooling rates results in different distribution characteristics of phases and magnetic properties of the ribbons. The 10 m/s ribbons are composed of Sm–Cu- and Co-rich Sm(Co, M) 5 phases and then the lamellate Sm 2 (Co, M) 7 coexists with CeCo 5 -type Sm(Co, M) 5 grains in the 25 m/s ribbons, while the 40 m/s ribbons form a cellular microstructure with Sm 2 (Co, M) 7 grain boundaries and Sm(Co, M) 5 intracellular grains. Correspondingly, the coercivity, remanence, and maximum magnetization of 40 m/s ribbons are 74.3%, 64.3%, and 53.2% higher than those of 10 m/s ribbons. At the same time, the coercivity mechanism and microstructure evolution are discussed.