Abstract
Al–4.95 wt% Zn alloy is directionally solidified with Bridgman apparatus to investigate response of cellular/dendritic microstructures and primary spacing to the variation of growth velocity. The results show that, with increasing growth rate, there exist a transition from dendrite to cell and a wide distribution range in primary cellular/dendritic spacing. The maximum, λ max, minimum, λ min, and average primary spacing, λ ̄ , as functions of growth rate, V, can be given by λ max=4578 V −0.697, λ min=1315.7 V −0.6543, λ ̄ =3084.5 V −0.6982, respectively. The experimental results are compared with the Hunt–Lu model, and a reasonable agreement is found.
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