On morphology-dependent growth of secondary dendrite arms: Analysis in peritectic systems
On morphology-dependent growth of secondary dendrite arms: Analysis in peritectic systems
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DOI：
10.1016/j.jallcom.2019.05.262
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发表时间：
2019-08
影响因子：
6.2
通讯作者：
P. Peng
中科院分区：
文献类型：
--
作者：
P. Peng
虽然二次枝晶的生长动力学是决定合金最终性能的关键，但对它的研究还很少。基于易于测量的表征二次枝晶臂生长形态的形态参数φ，分析了两种包晶体系：锡-镍和锡-锰两种包晶体系中二次枝晶生长形态对二次枝晶生长的影响。根据二次枝晶臂生长形态的不同，φ可将其分为三种不同的类型。建立了一个包含φ的解析模型来描述二次枝条的形态相关生长。实验数据与理论预测的二次枝晶臂生长速度的比较表明，形态参数φ能很好地描述不同合金中二次枝晶臂生长动力学与二次枝晶臂形态之间的关系：φ越小，二次枝晶臂生长速度越大。
Although the growth dynamics of secondary branch is essential in determining the final properties of alloys, research on it is rather scarce. Based on a morphology parameterφwhich is easily measured to characterize the growth morphology of secondary dendrite arm, the growth behavior of secondary branch which is influenced by its morphology is analyzed in two peritectic systems: Sn-Ni and Sn-Mn. The growth of secondary dendrite arm can be divided into three different types according toφdepending on its growth morphology. An analytical model incorporatingφis established to describe the morphology-dependent growth of secondary branch. Comparison between the experimental data and theoretical predictions on the growth velocity of secondary dendrite arm shows that the morphology parameterφcan well describe the relationship between growth dynamics and the morphology of secondary dendrite arm in different alloys: a smallerφindicates a larger growth velocity of secondary dendrite arm.