In general, the fine structure and superior mechanical
properties of SC-components are due to the following
factors: (i) changes in undercooling of the molten alloy,
(ii) changes in the composition and percentages of the
forming phases of the solidifying alloy, (iii) changes in
the heat-transfer coefficient between the metallic mould
and solidifying alloy, and (iv) changes in the density of
the alloy due to reduction of porosity.