Abstract
Electron diffraction studies of silicon fibres in strontium-modified and chill-modified Al—14%Si alloy show a significant difference in behaviour. In the strontium-modified alloy the silicon fibres exhibit a very high twin density and at least two {111} twin systems operate in each fibre. In the chill-modified alloy only a single {111} twinning system was observed in each fibre, as in unmodified eutectic, and twin density was much lower. It seems probable that strontium modification causes refinement by intensification of the TPRE growth mechanism, but that a different mechanism operates in chill modification.
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