Abstract
The effect of dopant ternary additions of Zn, Ga, Ge, Cu, Mg and Si on the heterogenous nucleation of solidification of Cd and Pb particles embedded in an Al matrix has been investigated in rapidly solidified Al-Cd-X and Al-Pb-X alloys using a combination of differential scanning calorimetry and transmission electron microscopy. Except for Si, the dopant additions have no effect on the alloy microstructures and remain in solution in the Al matrix and the Cd or Pb particles after rapid solidification and during heat treatment in the calorimeter. In general, the catalytic efficiency of Al as a heterogeneous nucleant for Cd and Pb solidification does not change inversely with changes in lattice disregistry across the nucleating interface in disagreement with Turnbull and Vonnegut's prediction. These results demonstrate the importance of chemical factors in determining the catalytic efficiency of heterogeneous nucleants.
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