Eutectic growth: Selection of interlamellar spacings
Eutectic growth: Selection of interlamellar spacings
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DOI：
10.1007/bf02647722
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发表时间：
1988-12
期刊：
影响因子：
--
通讯作者：
V. Seetharaman;R. Trivedi
中科院分区：
文献类型：
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作者：
V. Seetharaman;R. Trivedi
为了建立定向凝固共晶合金的层间间距选择准则，在模型透明有机体系中进行了关键的实验研究。结果表明，在给定速度下，间距选择不是很明显，间距分布是有限的。分布的宽度随着速度的减小而增大。该间距带位于片层稳定性理论预测的稳定区内，平均间距略高于对应的最小过冷条件值。还进行了初始间距大于或小于最终间距的速度变化实验。在这两种情况下，平均共晶间距都向间距值偏移，该值略大于最终速度的最小稳定间距。所有实验结果都表明，共晶间距的稳定范围比Jackson和Hunt讨论的要小得多。
Critical experimental studies in a model transparent organic system have been carried out to establish the interlamellar spacing selection criterion for directionally solidified eutectic alloys. It is shown that the spacing selection is not very sharp and a finite distribution of spacing is observed for a given velocity. The width of the distribution is found to increase as the velocity is decreased. This band of spacings is shown to lie within the stable zone predicted by the lamellar stability theory, and the average spacing lies slightly above the value which corresponds to the minimum undercooling condition. A number of velocity change experiments were also carried out in which the initial spacing was either larger or smaller than the final spacing. For both these conditions, the average eutectic spacing is found to drift toward the spacing value which is slightly larger than the smallest stable spacing for the final velocity. All experimental results show that the stable range of eutectic spacings is much smaller than that discussed by Jackson and Hunt.