Precipitation of icosahedral quasicrystalline and crystalline approximant phases in Zr-Cu-(Co, Rh or Ir) metallic glasses |
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Authors: | Chunfei Li Limin WangAkihisa Inoue |
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Institution: | a Inoue Superliquid Glass Project, ERATO, JST, Sendai 982-0807, Japan b Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan |
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Abstract: | Zr70Cu30, Zr70Cu20Co10, Zr70Cu20Rh10 and Zr70Cu20Ir10 glassy alloys were prepared by the single roller melt-spinning method and the crystallization process was studied by differential scanning calorimetry, X-ray diffraction and transmission electron microscopy, with an emphasis on the initial stage. The Zr70Cu30 metallic glass crystallizes through the direct precipitation of the stable crystalline phase from the matrix. The addition of Co, Rh and Ir to the Zr70Cu30 metallic glass induces the precipitation of metastable phases prior to the formation of the stable ones. The metastable phases are a Ti2Ni-type compound for Zr70Cu20Co10, a mixture of the Ti2Ni-type compound and an icosahedral quasicrystalline phase (I-phase) for Zr70Cu20Rh10, and the I-phase for Zr70Cu20Ir10 metallic glasses. The different effects of Co, Rh and Ir addition are explained based on their difference in atomic radius. |
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Keywords: | M190 Q110 |
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