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Electron microscopy of metastable phases in rapidly solidified Al-Co alloys

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Abstract

Four binary Al-Co alloys containing 2·4, 14, 20 and 25 at.% Co and a ternary Al-Co-Si alloy with 20 at.% Co and 5 at.% Si were rapidly solidified from the liquid state by melt spinning. It has been shown that the solid solubility of Co in Al can be increased up to at least 1·7at.% from the negligible value under equilibrium conditions. Two metastable crystalline intermediate phases and a D1 a -type ordered phase were observed in localized regions in the rapidly solidified Al-2·4at.%Co alloy. A quasicrystalline decagonal phase has been observed in all the other rapidly solidified alloys. This decagonal phase was shown to contain dislocations, dislocation loops and also twin-like defects. The phenomenon of polytypism was also observed in this decagonal quasicrystalline phase. In extremely thin areas of the Al-14at.% Co alloy ribbons on amorphous phase was detected. Transmission electron microscopy was used to extensively characterize the phases in the as-solidified condition and also those produced during and after transformation to the equilibrium constitution.

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Authors and Affiliations

  1. Institute for Materials and Advanced Processes, University of Idaho, 83844-3026, Moscow, ID, USA

    C Suryanarayana & Jyothi Menon

  2. Engineering Materials Group, Department of Mechanical Engineering, University of Windsor, N9B 3P4, Windsor, Ontario, Canada

    Jyothi Menon

Authors
  1. C Suryanarayana
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  2. Jyothi Menon
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Work carried out when both the authors were in the Department of Metallurgical Engineering, Banaras Hindu University, Varanasi 221 005, India

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Suryanarayana, C., Menon, J. Electron microscopy of metastable phases in rapidly solidified Al-Co alloys. Bull. Mater. Sci. 17, 121–139 (1994). https://doi.org/10.1007/BF02747560

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  • DOI: https://doi.org/10.1007/BF02747560

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