Melting Temperature, Transformation and Metastable Phase Diagram of Rapidly Solidified Ag–Cu Alloys

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  • Fredriksson H.
    Department of Materials Processing, Royal Institute of Technology
  • Arai Y.
    Institute for Advanced Materials Processing, Tohoku University
  • Emi T.
    Institute for Advanced Materials Processing, Tohoku University
  • Haddad-Sabsevar M.
    Department of Materials Processing, Royal Institute of Technology
  • Shibata H.
    Institute for Advanced Materials Processing, Tohoku University

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  • Melting Temperature, Transformation and Metastable Phase Diagram of Rapidly Solidified Ag–Cu Alloys
  • Melting Temperature Transformation and

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Cu–Ag samples produced during rapid solidification experiments using a Planar Flow Melt Spinning Process or a levitation casting technique were rapidly heated in a mirror furnace to a variety of temperatures at rates between 100 and 1.6 K/s. The surface of each sample was observed in a confocal laser scanning microscope. Metallographic analyses were performed on the samples by optical and scanning electron microscopy. The rapidly solidified samples melted far below the equilibrium melting point.<BR>The melted and resolidified samples mostly consisted of structures similar to those seen in alloys with a miscible gap.<BR>It is proposed that this type of behaviour is a result of lattice defects formed during the rapid solidification process. The effect of these defects on the thermodynamic properties was investigated. A metastable phase diagram with a miscibility gap can be constructed below the equilibrium melting point. This could explain the observed phase structure and the melting of the alloy below the equilibrium melting point.

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