Pressure Dependence to Hydrogen-Induced Amorphization in C15 Laves Phase TbFe_2

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The pressure dependence of structural changes of C15 Laves phase TbFe<SUB>2</SUB> heated in a hydrogen atmosphere was investigated using a pressure differential scanning calorimeter (PDSC), a powder X-ray diffractometer (XRD), a differential scanning calorimeter (DSC) and a hydrogen analyzer. Hydrogen absorption in the crystalline state, hydrogen-induced amorphization (HIA), precipitation of TbH<SUB>2</SUB> and decomposition of the remaining amorphous alloy into α-Fe and TbH<SUB>2</SUB> occurred exothermally with increasing temperature above 0.5 MPa H<SUB>2</SUB>, independent of the heating rate. HIA and precipitation of TbH<SUB>2</SUB> occurred simultaneously in 0.2 MPa H<SUB>2</SUB> (0.33 K/s) and in 0.1 MPa H<SUB>2</SUB> (0.17 K/s). On the contrary, hydrogen absorbed crystalline <I>c</I>-TbFe<SUB>2</SUB>H<SUB>3.5</SUB> decomposed directly into α-Fe and TbH<SUB>2</SUB> in 0.1 MPa H<SUB>2</SUB> (0.33 K/s). That is, no amorphous phase was formed at the lower hydrogen pressure and at a high heating rate. The reason why HIA occurs above the critical hydrogen pressure and below the critical heating rate was discussed on the basis of the hydrogen content absorbed in the crystalline state of TbFe<SUB>2</SUB>.

収録刊行物

  • Materials transactions

    Materials transactions 43(5), 1089-1094, 2002-05-01

    公益社団法人 日本金属学会

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各種コード

  • NII論文ID(NAID)
    10012323508
  • NII書誌ID(NCID)
    AA1151294X
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    13459678
  • NDL 記事登録ID
    6180226
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z53-J286
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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