Nd_<90>Fe_<10>ガスジェット浮遊溶融凝固試料の非平衡相生成と高保磁力発現 Metastable Phase Formation and High Coercivity of Nd_<90>Fe_<10> by Gas Flow Type Levitating Process

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著者

    • 米村 寛 YONEMURA Hiroshi
    • 芝浦工業大学工学部材料工学科 Department of Materials Science, Faculty of Engineering, Shibaura Institute of Technology
    • 東雲 秀司 AZUMO Shuji
    • 芝浦工業大学工学部材料工学科 Department of Materials Science, Faculty of Engineering, Shibaura Institute of Technology

抄録

  In the last decades, Nd-Fe amorphous alloys have been studied by many methods because of high coercivity at room temperature and relation to Nd-Fe-B permanent magnets. In this study, we examined the effect of the containerless process for high undercooling and the metastable phase formation in detail.<br>    In the gas levitating process, undercooling of Nd<sub>90</sub>Fe<sub>10</sub> samples increased with cooling rate. Undercooling of Nd<sub>90</sub>Fe<sub>10</sub> sample solidified at 268 K/s is Δ<i>T</i>=35 K. The primary α-Nd phases were surrounded by fine metastable phases. And the intergranular eutectic-like areas were comprised of α-Nd phase and metastable phase. In contrast, the sample with low undercooling was comprised of α-Nd phases and rod-like Nd<sub>2</sub>Fe<sub>17</sub> phases among primary α-Nd phases. In Nd<sub>90</sub>Fe<sub>10</sub> samples with undercooling of Δ<i>T</i>=35 K, coercivity of Nd<sub>90</sub>Fe<sub>10</sub> samples is about 4.5 kOe at room temperature. This high coercivity is caused by fine crystallization of matastable phases.<br>

収録刊行物

  • 日本金屬學會誌 = Journal of the Japan Institute of Metals  

    日本金屬學會誌 = Journal of the Japan Institute of Metals 72(2), 80-84, 2008-02-01 

    The Japan Institute of Metals

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各種コード

  • NII論文ID(NAID)
    10021149579
  • NII書誌ID(NCID)
    AN00062446
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    00214876
  • NDL 記事登録ID
    9371195
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-314
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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