Dendritic growth
Dendritic growth
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DOI：
10.1179/imr.1994.39.2.49
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发表时间：
1994-01
影响因子：
16.1
通讯作者：
R. Trivedi;W. Kurz;Ames Laboratory
中科院分区：
文献类型：
--
作者：
R. Trivedi;W. Kurz;Ames Laboratory
枝晶组织是凝固合金的主要显微组织成分。枝晶的微观结构尺度，如一级和二级臂间距，控制着偏析模式，这在很大程度上决定了材料的性能。在过去的十年中，通过严格的理论模型和严格的实验研究，以及表征系统的树突状结构的理解的重大发展已经演变。这些研究结果建立了在给定的实验条件下选择枝晶尖端半径的标准。此外，在过去的十年中，在预测快速凝固条件下发展的微观结构特征方面取得了重要进展，并且还进行了一些关键的实验研究来检查这些微观结构。这些研究表明，界面处的非平衡条件显著影响在快速凝固条件下形成的枝晶的特性。在这篇综述中，对枝晶生长现象的现状进行了研究和批判性的评估，并对枝晶生长研究的未来方向提出了建议。
Dendritic structures are the predominant microstructural constituents of solidified alloys. The microstructural scales of dendrites, such as primary and secondary arm spacings, control the segregation pattern that largely determines the properties of the material. Within the past decade significant developments in understanding of dendritic structures have evolved through rigorous theoretical models and critical experimental studies in well characterised systems. These studies have resulted in the establishment of the criterion by which dendrite tip radius is selected under given experimental conditions. Furthermore, during the past decade, important advances have been made in predicting microstructural features that develop under rapid solidification conditions, and some key experimental studies have also been carried out to examine these microstructures. These studies have shown that the non-equilibrium conditions at the interface influence significantly the characteristics of dendrites formed under rapid solidification conditions. In this review the current status of dendritic growth phenomena are examined and critically assessed and key areas for the future directions of dendritic growth studies are suggested.