HISTORY DEPENDENCE OF PRIMARY DENDRITIC SPACING DURING UNIDIRECTIONAL SOLIDIFICATION

Acta Metall Sin

1995, Vol. 31

Issue (10): 469-474 DOI:

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HISTORY DEPENDENCE OF PRIMARY DENDRITIC SPACING DURING UNIDIRECTIONAL SOLIDIFICATION

DING Guolu; LIN Hin; HUANG Weidong; ZHOU Yaohe (Northwestern Polytechnical University; Xi'an 710072)(Manuscript received 1995-03-23)

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DING Guolu; LIN Hin; HUANG Weidong; ZHOU Yaohe (Northwestern Polytechnical University; Xi'an 710072)(Manuscript received 1995-03-23). HISTORY DEPENDENCE OF PRIMARY DENDRITIC SPACING DURING UNIDIRECTIONAL SOLIDIFICATION. Acta Metall Sin, 1995, 31(10): 469-474.

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Abstract A transparent model alloy,succinonitrile-1.0 wt─% acetone,is directionally solidified to investigate the dynamic response of primary dendritic spacing to the variation of the solidification parameters (i.e., growth velocity and temperature gradient).The lower and upper limits of the allowed range of primary spacing,as a function of growth velocity, are then experimentally obtained. It shows that the lower and upper limits of the allowed range are very sharp, but average primary spacing is remarkably history─dependent not only on growth velocity but also on temperature gradient. The experimental result of the lower limit is in good agreement with that predicted by the modified Hunt─Lu model, while the result of the upper limit is apparrently larger than that by the Hunt─Lu model.Correspondent: DING Guolu, Faculty No.403, Northwestern Polytechnical University, Xi'an 710072

Key words: primary dendritic spacing unidirectional solidification history dependence

Received: 18 October 1995

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