首页|在不同直径坩埚中定向凝固Sn-Ni包晶合金的宏观偏析和热溶质对流引起的雀斑缺陷

在不同直径坩埚中定向凝固Sn-Ni包晶合金的宏观偏析和热溶质对流引起的雀斑缺陷

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与其他合金系不同,本文通过对定向凝固Sn-Ni包晶合金中枝晶状糊区的观察发现,雀斑缺陷在包晶反应前后的两个不同区域出现.此外,实验结果证明,枝晶形貌受温度梯度区域熔化效应和Gibbs-Tbomson效应的影响.因此,提出考虑上述两种效应及包晶反应的新瑞利数RaP.新瑞利数RaP的计算预测结果证实包晶凝固过程中雀斑在两个不同区域形成,且在较大直径的试样中热溶质对流更显著.
Macrosegregation and thermosolutal convection-related freckle formation in directionally solidified Sn-Ni peritectic alloy in crucibles with different diameters
Different from other alloys, the observation in this work on the dendritic mushy zone shows that the freckles are formed in two different regions before and after peritectic reaction in directional solidification of Sn-Ni peritectic alloys. In addition, the experimental results demonstrate that the dendritic morphology is influenced by the temperature gradient zone melting and Gibbs-Thomson effects. A new Rayleigh number (RaP) is proposed in consideration of both effects and peritectic reaction. The prediction of RaP confirms the freckle formation in two regions during peritectic solidification. Besides, heavier thermosolutal convection in samples with larger diameter is also demonstrated.

freckle formationdirectional solidificationthermosolutal convectiondendritic solidificationSn-Ni peritectic alloy

彭鹏、李升渊、郑万朝、鲁力、周树东

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兰州大学材料与能源学院,兰州 730000

兰州大学磁学与磁性材料教育部重点实验室,兰州 730000

西北稀有金属研究院,石嘴山 753000

雀斑形成 定向凝固 热溶质对流 枝晶凝固 Sn-Ni包晶合金

Authors thank to the financial supports from the National Natural Science Foundation of ChinaBasic Scientific Research Business Expenses of the Central University and Open Project of Key Laboratory for Magnetism and MScience and Technology Project of Lanzhou City,ChinaState Key Laboratory of Special Rare Metal Materials,China

51871118LZUMMM20210052019-1-30SKL2020K003

2021

10.1016/S1003-6326(21)65718-7

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(10)
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