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Directional Solidification of Zn 2.75%Cu Alloy and the Effect of ACRT Forced Convection

The directional solidification of Zn 2.75Wt%Cu alloy by Bridgman and ACRT B (Accelerated Crucible Rotation Technology Bridgeman) methods have been experimentally investigated. Study concentrated on the influences of growth velocity and forced convection on the microstructure. The temperature distribution in the directional solidifying samples was measured to reveal the influences of growth velocity on the temperature gradient in front of the growth interface. The optical microstructure analysis reveals that primary dendrite spacing of the e phase decreases with increasing growth velocity and temperature gradient, following the equation: λ 1=0.6064R -0.25 G L -0.5 . Forced convection during ACRT B process makes the primary dendrites branch off and twist. Meanwhile, the primary dendrite spacing is decreased and the secondary dendrite branches are restrained. The primary dendrites usually survive the following peritectic reaction, but the dendrites become sharper and the secondary dendrites may be dissolved.