The microstructure and magnetization reversal behavior of melt-spun (Nd1-xCex)-Fe-B ribbons
来源期刊：JOURNAL OF RARE EARTHS2018年第1期
论文作者：Liwei Song Nengjun Yu Minggang Zhu Qiang Wang Wei Li
文章页码：95 - 98
摘 要：In this study,the alloy ingots with nominal compositions of(Nd1-xCex)31FebalCo0.2Ga0.1B（x=0, 0.1 wt%,0.2 wt%, 0.3 wt%, 0.4 wt%, 0.5 wt%） were prepared and then melt-spun to form nanocrystalline ribbons at the wheel speed of 20 m/s. XRD results show that all melt-spun ribbons exhibit the tetragonal structure（Nd,Ce）2 Fe14B phase with the space group P42/mmm. The Curie temperature and lattice constant decrease with the increase of Ce content. The Curie temperature decreases gradually from 306 to 247 ℃with the increase of Ce content. Those results indicate that Ce element has been incorporated into Nd2 Fe14B main crystalline phase and formed（Ce,Nd）-Fe-B hard magnetic phase. It is also found that the remanence ratio（Mr/Ms） decreases from 0.693 to 0.663 and the coercivity（Hc） decreases from 18.7 to14.2 kOe with the increase of Ce content. However, a relatively high coercivity of 18.3 kOe for(Nd1-xCex)31FebalCo0.2Ga0.1B（x = 0.2） melt-spun ribbon is achieved. The coercivity is sensitive to microstructure. The AFM patterns show the sample（x = 0.2） has the most uniform and finest microstructure. The magnetization reversal behavior（δM plots） is discussed in detail. The positive δM value is observed in every sample, which confirms the existence of exchange coupling interaction. Evidently, theδM maximum value reaches 0.9 in the sample（x = 0.2）. It is indicated that the intergranular exchange coupling effect is the strongest, which is consistent with coercivity enhancing.
Liwei Song1,2,3，Nengjun Yu1,2,3，Minggang Zhu1，Qiang Wang2，Wei Li1
1. Division of Functional Materials,Central Iron and Steel Research Institute2. Key Laboratory of National Education Ministry for Electromagnetic Processing of Materials,Northeastern University3. School of Materials Science and Engineering,Northeastern University
摘 要：In this study,the alloy ingots with nominal compositions of(Nd1-xCex)31FebalCo0.2Ga0.1B（x=0, 0.1 wt%,0.2 wt%, 0.3 wt%, 0.4 wt%, 0.5 wt%） were prepared and then melt-spun to form nanocrystalline ribbons at the wheel speed of 20 m/s. XRD results show that all melt-spun ribbons exhibit the tetragonal structure（Nd,Ce）2 Fe14B phase with the space group P42/mmm. The Curie temperature and lattice constant decrease with the increase of Ce content. The Curie temperature decreases gradually from 306 to 247 ℃with the increase of Ce content. Those results indicate that Ce element has been incorporated into Nd2 Fe14B main crystalline phase and formed（Ce,Nd）-Fe-B hard magnetic phase. It is also found that the remanence ratio（Mr/Ms） decreases from 0.693 to 0.663 and the coercivity（Hc） decreases from 18.7 to14.2 kOe with the increase of Ce content. However, a relatively high coercivity of 18.3 kOe for(Nd1-xCex)31FebalCo0.2Ga0.1B（x = 0.2） melt-spun ribbon is achieved. The coercivity is sensitive to microstructure. The AFM patterns show the sample（x = 0.2） has the most uniform and finest microstructure. The magnetization reversal behavior（δM plots） is discussed in detail. The positive δM value is observed in every sample, which confirms the existence of exchange coupling interaction. Evidently, theδM maximum value reaches 0.9 in the sample（x = 0.2）. It is indicated that the intergranular exchange coupling effect is the strongest, which is consistent with coercivity enhancing.
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