中国空间科学技术

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枝晶生长中的对流效应与形态选择——地基实验研究

黄惂,刘山,鲁德洋,周尧和,程功善,张福生   

  1. 西北工业大学 ,西北工业大学 ,西北工业大学 ,西北工业大学 ,西北工业大学 ,西北工业大学
  • 发布日期:1989-02-25

FLUID FLOW AND PATTERN SELECTION IN DENDRITIC GROWTH——GROUND BASED IN SITU OBSERVATION

Huang Tao Liu Shah Lu Deyang Zhou Yaohe Cheng Gongshan Zhang Fusheng (Northwestern Polytechnical University,Xian,China)   

  • Published:1989-02-25
  • Supported by:
    国家自然科学基金资助课题

摘要： 通过在生长界面前区域创生液相流动,研究了在稀薄合金中对流对强制性枝晶生长的作用。本文首次报告了对流对强制性枝晶生长的影响。SCN—Acc.模型合金中的定量实验表明,枝晶生长的动力学和形态是温度梯度、生长速度和枝晶端前沿液体流动速度的函数。作为以地面为基础的实验研究,将有助于理解太空凝固试验的结果。

关键词: 对流, 形态学, 晶体生长

Abstract: Model experiments on fluid flow and pattern selection havebeen done by creating flow in liquid region close to the growth fronts indendritic growth of SCN-aceton dilute alloys.The kinetics and morphologyof dendritic growth were measured as a function of thermal gradient,growth velocity and flow velocity.The present paper provides the firststudy of convection effects on constrained dendritic and cellular growthwhich focuses on the tip morphology and develops a boundary layeranalysis.All of the problems addressed have application to the interpreta-tion of the experimental phenomena arising from solodification and fiuiddynamics on earth and space laboratory.