Crystallization Behavior and Phase Formation in Zr-Al-Cu-Ni Metallic Glass Containing Oxygen

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Differential scanning calorimetry, X-ray diffraction and transmission electron microscopy were used to study the thermal stability and the phase formation during annealing of (Zr<SUB>0.65</SUB>Al<SUB>0.075</SUB>Cu<SUB>0.175</SUB>Ni<SUB>0.10</SUB>)<SUB>100−<I>x</I></SUB>O<I><SUB>x</SUB></I> metallic glasses (0.2≤<I>x</I>≤0.8) prepared by melt spinning. Increasing oxygen content changes the crystallization mode from a single to a double step process. The glass transition temperature <I>T</I><SUB>g</SUB> increases slightly with increasing oxygen content whereas the crystallization temperature <I>T</I><SUB>x</SUB> decreases, causing a reduction of the undercooled liquid region. The deterioration of the thermal stability is related to oxygen-induced formation of metastable quasicrystalline and fcc NiZr<SUB>2</SUB>-type phases which coexist with tetragonal Cu(Al, Ni)Zr<SUB>2</SUB> and hexagonal Zr<SUB>6</SUB>NiAl<SUB>2</SUB> for <I>x</I>=0.2 and 0.4. For <I>x</I>=0.8 only the quasicrystalline phase is observed in the first step of crystallization. The details of phase formation and transformation during crystallization depend strongly on the annealing conditions. At elevated temperatures the quasicrystals transform into Cu(Al, Ni)Zr<SUB>2</SUB> and the fcc phase transforms into the stable Zr<SUB>6</SUB>NiAl<SUB>2</SUB> compound. Increasing oxygen content leads to more pronounced metastable phase formation in the first step of crystallization at lower temperatures, and extends the stability regime of these phases to higher temperatures. For annealing temperatures ≥873 K the samples exhibit the same crystallization products regardless of the oxygen content of the material.

収録刊行物

  • Materials transactions, JIM

    Materials transactions, JIM 39(6), 623-632, 1998-06

    社団法人 日本金属学会

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各種コード

  • NII論文ID(NAID)
    10003802838
  • NII書誌ID(NCID)
    AA10699969
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    09161821
  • NDL 記事登録ID
    4505427
  • 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
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