【摘要】 本文阐述了一次枝晶间距与生长速度、温度梯度及合金成分之间的关系,并与HUNT及KURZ-FISHER模型进行了比较。发现在高的生长速度下(V>V_tr),三种理论所得结论仅差一个常数;但在低的生长速度下(V<V_tr),三种理论完全不同。本理论与TR1-VEDI等人在琥珀-丙酮系统中的实验数据符合得很好。更多还原

【Abstract】 In this paper, a theoretical magnitude analysis has been developed to exp-lain the variation in the primary arm spacing with the growth rate, temp-erature gradient and physical properties of alloys. and it is comparad withthe existing theoretical models of HUNT and of KURZ and FISHER. Ithas been found that these three models give very similiar results for thehigh velocity regime (V>Vtr) and rather diffirent results for the low velo-city regime (V<Vtr). The derived relationship agrees very well with theexprimental data by TRIVEDI et al. in the succinonitrile-acetone system.更多还原