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      Effect of Small Dysprosium Additions on the Coercivity of Melt-Spun Nd-Fe-C Alloys

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      https://www.riss.kr/link?id=E805528

      • 저자
      • 발행기관
      • 발행연도

        1999년

      • 작성언어

        English

      • KDC

        420.000

      • 자료형태

        한국연구재단(NRF)

      • 수록면

        3310-3312

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      다국어 초록 (Multilingual Abstract)

      영어
      한국어
      The influence of small dysprosium additions on the microstructural development and the coercivity of melt-spun iron-rich Nd^(15-χ)Dy_(χ)Fe_(77)C_(8) (x = 0.5 ∼ 5.0) alloys was investigated. By x-ray diffraction analysis, it was found that amorphization of as-spun ribbons spun at 25 m/s was promoted by increasing the Dy addition. The ribbons became fully amorphous with 5.0 at% Dy. Small additions of Dy not only improved the thermal stability of Nd_(2)Fe_(14)C, which was obtained by a proper annealing, but also enhanced the grain refinement of the Nd_(2)Fe_(14)C, resulting in a large increase in coercivity. When the addition of Dy was more than 3.0 at%, the intrinsic coercivities of more than 17 kOe, which would be the highest coercivity ever obtained from iron-rich Nd-Fe-C alloys, were easily obtained after annealing 10 min. at 800 ∼ 900℃.
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      The influence of small dysprosium additions on the microstructural development and the coercivity of melt-spun iron-rich Nd^(15-χ)Dy_(χ)Fe_(77)C_(8) (x = 0.5 ∼ 5.0) alloys was investigated. By x-ray diffraction analysis, it was found that amorphiz...

      The influence of small dysprosium additions on the microstructural development and the coercivity of melt-spun iron-rich Nd^(15-χ)Dy_(χ)Fe_(77)C_(8) (x = 0.5 ∼ 5.0) alloys was investigated. By x-ray diffraction analysis, it was found that amorphization of as-spun ribbons spun at 25 m/s was promoted by increasing the Dy addition. The ribbons became fully amorphous with 5.0 at% Dy. Small additions of Dy not only improved the thermal stability of Nd_(2)Fe_(14)C, which was obtained by a proper annealing, but also enhanced the grain refinement of the Nd_(2)Fe_(14)C, resulting in a large increase in coercivity. When the addition of Dy was more than 3.0 at%, the intrinsic coercivities of more than 17 kOe, which would be the highest coercivity ever obtained from iron-rich Nd-Fe-C alloys, were easily obtained after annealing 10 min. at 800 ∼ 900℃.

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      목차 (Table of Contents)

      • Ⅰ. INTRODUCTION
      • Ⅱ. EXPERIMENTAL
      • Ⅲ. RESULTS AND DISCUSSION
      • Ⅳ. CONCLUSIONS
      • REFERENCES
      • Ⅰ. INTRODUCTION
      • Ⅱ. EXPERIMENTAL
      • Ⅲ. RESULTS AND DISCUSSION
      • Ⅳ. CONCLUSIONS
      • REFERENCES
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