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Metastable phase equilibria in the lead-tin alloy system: Part I. Experimental

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Abstract

Several metastable phase boundaries in the Pb-Sn alloy system have been determined in undercooled droplets containing different phase mixtures by means of X-ray diffraction lattice parameter and thermal analysis measurements. With droplets equilibrated as (α-Pb+L) mixtures, the metastable α-Pb solidus has been determined to reach 46 at. pct Sn with a corresponding liquidus at 87 at. pct Sn for a temperature 73°C below that for the stable eutectic. An extension of the metastable liquidus and solidus boundaries implies a melting of fcc Sn at about 5°C which agrees well with thermodynamic model calculations. With some solidification treatments a metastable, intermediate, body-centered tetragonal α1 phase can form in alloys with compositions between 35 and 73 at. pct Sn. Upon heating, the α1-phase decomposes to a supersaturated α-Pb phase and liquid by a peritectic reaction at 127°C. Calorimetric measurements yield an enthalpy of ΔH α 1 = 3.16 ± 0.3 kJ/g atom for the α1/(α-Pb + L) peritectic reaction. The combination of the measured stable equilibria, the partial metastable equilibria determination, and phase equilibria modeling has allowed for a more complete description of metastable equilibrium behavior and for the analysis of some of the solidification pathways that are available for the synthesis of metastable product structures.

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Authors and Affiliations

  1. Keck Laboratory, California Institute of Technology, 91125, Pasadena, CA

    H. J. Fecht

  2. Department of Metallurgical and Mineral Engineering, University of Wisconsin-Madison, 53706, Madison, WI

    J. H. Perepezko (Professor)

Authors
  1. H. J. Fecht
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  2. J. H. Perepezko
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Fecht, H.J., Perepezko, J.H. Metastable phase equilibria in the lead-tin alloy system: Part I. Experimental. Metall Trans A 20, 785–794 (1989). https://doi.org/10.1007/BF02651645

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  • DOI: https://doi.org/10.1007/BF02651645

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