Abstract
(1) The relation curve of the volume change during solidification and composition of the Pb-Bi system is more complex in the alloy range which has the peritectic reaction than that of the simple eutectic type system, and the relation between the volume shrinkage by peritectic reaction and composition is the straight line. (2) The volume shrinkage during solidification of the Pb-Bi system is larger than the calculated value by the mixture rule. This is attributed to the fact that the specific volume is smaller in the solid state but larger in the liquid state than calculated value by the mixture rule. Hence by adding corrected values to the calculated value, the latter was found to be in good agreement with the former. (3) The relation between the volume shrinkage and composition in the Sn-Cd system resemble to that of the simple eutectic type system, but, there is no max. point at the composition of max. solidification interval, because the specific volume is larger than the calculated value by the mixture rule. By adding similarly the corrected value to the calculated value, the calculated and observed values were found to be in good agreement.
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