| Single crystal growth of pure aluminum was studied by using upward continuous casting process. In the present study, a ceramic mold without using a heater was used. Heterogeneous nucleation at the mold wall could be inhibited during solidification by keeping the liquid slightly above the melting point of the metal. Three process variables, i.e. mold temperature, pulling speed and cooling condition, were analysed in terms of their effects on crystal growth. Single crystal was produced by repeated necking. Single crystal could be also produced by making a single necking with a relatively long necking period. By using the new continuous casting process, single crystal of unlimited length could be produced with excellent diameter control and surface smoothness. |
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