| Influence of solidification rate on the microstructure of （Nd，DY）12.8（Fe，Co）80.7B6.5 cast strips |
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| 作者姓名： | LIUHanqiang WANGBiao HANGuangbing GAORuwei |
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| 作者单位： | SchoolofPhysicsandMicroelectronics,ShandongUniversity,Jinan,250100,China |
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| 基金项目： | This work was financially supported by the High Technology Research and Development Program of China (“863”program) (No. 2002AA324050 and 2002AA302602) and the National Natural Science Foundation of China (No. 50371046). |
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| 摘 要： | The influence of solidification rate on the microstructure of (Nd,Dy)12.8(Fe,Co)80.7B6.5 cast strips was reported in this paper. The strips prepared at different wheel speeds were analyzed by X-ray diffraction (XRD). The microstructure of the strips was investigated by backscattered scanning microscope (BSM). The XRD results show that the strips are mainly composed of the main phase (Tx) existing apparent alignment along 00L]. The thickness of TI columnar grains is larger when the solidification rate is lower and the over-small isotropic microcystalline appear on the cooling surface of the strips when the solidification rate is too high. The adequate wheel speed for obtaining the optimum microstructure of the strips is about V = 2.0 m/s. The strip prepared at V = 2.0 m/s possesses suitable thickness and the highest alignment degree of T1 columnar grains, unifomly distributed Nd-rich phase, and no existence of α-Fe phase. This kind of cast strip is an ideal starting material for preparing sintered magnets with high magnetic properties.
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| 关 键 词： | 凝固速率 显微结构 铌镝铁钴硼铸带 X射线衍射 |
Influence of solidification rate on the microstructure of(Nd,Dy)12.8(Fe,Co)80.7B6.5 cast strips |
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| LIUHanqiang WANGBiao HANGuangbing GAORuwei.Influence of solidification rate on the microstructure of(Nd,Dy)12.8(Fe,Co)80.7B6.5 cast strips[J].Rare Metals,2005,24(2):200-204. |
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| Authors: | LIU Hanqiang WANG Biao HAN Guangbing GAO Ruwei |
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| Affiliation: | School of Physics and Microelectronics, Shandong University, Jinan, 250100, China |
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| Abstract: | The influence of solidification rate on the microstructure of (Nd,Dy)12.8(Fe,Co)80.7B6.5 cast strips was reported in this paper. The strips prepared at different wheel speeds were analyzed by X-ray diffraction (XRD). The microstructure of the strips was investigated by backscattered scanning microscope (BSM). The XRD results show that the strips are mainly composed of the main phase (T1) existing apparent alignment along 00L]. The thickness of T1 columnar grains is larger when the solidification rate is lower and the over-small isotropic microcrystalline appear on the cooling surface of the strips when the solidification rate is too high. The adequate wheel speed for obtaining the optimum microstructure of the strips is about V = 2.0 m/s. The strip prepared at V = 2.0 m/s possesses suitable thickness and the highest alignment degree of T1 columnar grains, uniformly distributed Nd-rich phase, and no existence of α-Fe phase. This kind of cast strip is an ideal starting material for preparing sintered magnets with high magnetic properties. |
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| Keywords: | metal material microstructure solidification rate cast strip Nd-Fe-B |
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