Primary cellular/dendritic spacing selection of Al–Zn alloy during unidirectional solidification
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, λmax, minimum, λmin, and average primary spacing, , as functions of growth rate, V, can be given by λmax=4578V−0.697, λmin=1315.7V−0.6543, =3084.5V−0.6982, respectively. The experimental results are compared with the Hunt–Lu model, and a reasonable agreement is found.
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