Direct Observation of the Solidification Phenomenon of a Tin-Lead Alloy

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  • Xing Jiandong
    Postgraduate Student, Chiba Institute of Technology
  • Motegi Tetsuichi
    Department of Metallurgical Engineering, Chiba Institute of Technology
  • Ohno Atsumi
    Department of Metallurgical Engineering, Chiba Institute of Technology

抄録

The solidification phenomenon was directly observed through an optical microscope on samples of 99.9% Sn, and Sn–Pb alloys containing 0.5, 10.0, 30.0, 38.1, 50.0, and 70.0 mass%Pb under two different temperature gradients, in order to study the influence of composition and temperature gradient on the formation of equiaxed crystals.<BR>It was observed that the solid-liquid interface advanced from the cooling end to the hotter part in the pure Sn, the Sn-0.5 mass%Pb and the Sn–Pb eutectic alloy under any temperature gradient. When the content of Pb, in the hypo-eutectic alloy, was increased to more than 5.0 mass%, the separation of equiaxed crystals from the cooling end was clearly observed under lower temperature gradient (900 K/m). Only the growth of dendritic crystals was observed, when the temperature gradient was larger (1800 K/m). The macrostructures of these samples were fine equiaxed crystals and thick columnars. In the hypo-eutectic alloy, the floatation of primary crystals was observed during the initial stage of solidification, and the eutectic solidification finally appeared regardless the existence of primary crystals.

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