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

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  • Eckert J.
    IFW Dresden, Institut für Metallische Werkstoffe
  • Mattern N.
    IFW Dresden, Institut für Metallische Werkstoffe
  • Zinkevitch M.
    IFW Dresden, Institut für Metallische Werkstoffe
  • Seidel M.
    IFW Dresden, Institut für Metallische Werkstoffe

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  • Crystallization Behavior and Phase Formation in Zr–Al–Cu–Ni Metallic Glass Containing Oxygen
  • Crystallization Behavior and Phase Form

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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 (Zr0.65Al0.075Cu0.175Ni0.10)100−xOx metallic glasses (0.2≤x≤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 Tg increases slightly with increasing oxygen content whereas the crystallization temperature Tx 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 NiZr2-type phases which coexist with tetragonal Cu(Al, Ni)Zr2 and hexagonal Zr6NiAl2 for x=0.2 and 0.4. For x=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)Zr2 and the fcc phase transforms into the stable Zr6NiAl2 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.

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