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Effect of Respective Additions of Ga, Zr and Combined Additions of Co, Ga, Zr on Magnetic Properties of Remanence-enhanced Nd_(8.4) Fe_(87.1) B_(4.5) Alloy

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Journal of Materials Science & Technology 2000年第2期16卷 118-120页

作者： baozhi cui, xiaokai sun, wei liu, zhidong zhang, dianyu geng and xinguo zhao (Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China) Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

The effect of a partial substitution of Zr, Ga; Co and Ga; Co. Ga and Zr; respectively, for Fe on the structure and magnetic properties of Nd_8.4Fe_87.1B_4.5 alloy prepared by mechanical alloying has been studied in detail. It has been shown that, intrinsic coercivity μ0 H_c and maximum magnetic energy product (BH)_max increase for only Zr or Ga-containing samples, which is mainly due to the refinement of soft grains. The combined addition of Co and Ga is less effective for improving μoH_c and (BH)_max than the respective addition of Co or Ga. which may be due to the formation of CsCl-type CoGa. μoH_c and (BH)_max for combined Co, Ga. Zr-added alloy are higher than those for the combined Co, Ga-added alloy but lower than those for only Zr-containing alloy.

关键词： Alloy Fe Zr on Magnetic Properties of Remanence-enhanced Nd Effect of Respective Additions of Ga Nd

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Structural and Magnetic Properties of Sm_3(Fe,Ti)_(29) and Sm_3(Fe,Ti)_(29)X_y (X=H, N) Compounds

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Journal of Materials Science & Technology 2000年第2期16卷 123-124页

作者： xinguo zhao, zhidong zhang, Zhijun GUO, wei liu, dianyu geng and baozhi cui (Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

The alloy with nominal composition Sm_2(Fe0.94Ti0.06)17 is prepared by arc-melting, hydrogenation and nitrogenation processes. The Sm_2(Fe0.94Ti0.06)17 alloy has a single phase of Sm_3(Fe, Ti)29 with the Nd_3(Fe, Ti)29-type structure. The corresponding hydride phase with the same phase structure of the parent alloy was formed after a hydrogen decrepitation (HD) process at 300℃. The hydrogenation at 800℃ mainly shows a HDDR process. The HD and nitrogenation at 500℃ result in increasing the Curie temperature of the alloy by 72℃ and by 158℃ due to lattice expansions, respectively. The anisotropic and isotropic Sm_3(Fe. Ti)29N_y magnets are obtained after HD, HDDR and the consequent nitrogenation, respectively. The optimum magnetic properties of Sm_3(Fe, Ti)29N_y powders achieved in the above two processes are: (i) B_r=0;82 T, _iH_c=4.48 kA/cm. (BH)_max=54.3 kJ/m^3, (ii) B_r=0.68 T, _iH_c=8.14 kA/cm, (BH)max=66.4 kJ/m^3.

关键词： Ti and Sm3 Structural and Magnetic Properties of Sm3 X=H X_y Fe,Ti Compounds Sm

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Hard Magnetic Properties of Sm-Fe-C Based Alloys Prepared by Mechanical Alloying

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Journal of Materials Science & Technology 2000年第2期16卷 125-126页

作者： dianyu geng, zhidong zhang, baozhi cui, Zhijun GUO, wei liu and xinguo zhao (International Center for Materials Physics, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China) International Center for Materials Physics Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

The structure and magnetic properties of SmyFe100-1.5yC0.5y(y=8～20) alloys prepared by mechanical alloying (MA) from Sm, Fe and graphite have been investigated systematically. In order to improve hard magnetic properties of the alloys prepared by mechanical alloying, a new method consisting of re-milling and re-annealing was developed. After being re-milled and re-annealed, the Curie temperature TC of the Sm-Fe-C alloys changes. The TC of 2:17 phase increases, whereas the TC of 2:14:1 phase decreases. After being re-annealed at low temperatures, the grain sizes of hard phases are smaller than those in the alloys annealed at high temperatures. The effects of Co or Ti substitution for Fe are studied.

关键词： Fe Hard Magnetic Properties of Sm-Fe-C Based Alloys Prepared by Mechanical Alloying Sm

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