Determination of the density of Pb-Sn melts and segregation phenomena on their crystallization
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The density of liquid lead-tin alloys (17.64, 25.34, 25.61, 26.07, and 33.88 at % Pb) has been determined using an γ-ray attenuation technique over the temperature range from the liquidus line to 750–1040 K. The experimental uncertainty of the density measurements is estimated to be within the range of ±0.20–0.25%. It has been shown that the temperature hysteresis of the melt density and thermal expansion, which was observed previously in several studies, disappears after stirring the melts. The distribution of the components through the height of the liquid and solid samples and its variation with time and during melting-crystallization has been investigated. The study shows that the melts do not segregate on long standing (about 4 hours) near the liquidus temperature. However, crystallization and melting of homogeneous Pb-Sn alloys is accompanied by liquation phenomenon, which is enhanced as the sample composition deviates from the eutectic one.
Key wordsmetals and alloys phase transitions melt density
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