Microsegregation of peritectic systems in a temperature gradient: Analysis in directionally solidified Sn–36at.%Ni peritectic alloy
Microsegregation of peritectic systems in a temperature gradient: Analysis in directionally solidified Sn–36at.%Ni peritectic alloy
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DOI：
10.1016/j.ijheatmasstransfer.2015.11.005
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发表时间：
2016-03
影响因子：
5.2
通讯作者：
P. Peng;Xinzhong Li;Yan-Qing Su;Jingjie Guo;H. Fu
中科院分区：
文献类型：
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作者：
P. Peng;Xinzhong Li;Yan-Qing Su;Jingjie Guo;H. Fu
微观偏析在诱发过程中受到多种因素的影响，但忽略了某些重要因素的耦合作用。在Sn-36 at.%的定向凝固过程中，Ni包晶合金在高温度梯度下，由温度梯度区熔引起初生相和包晶相的熔化/凝固。提出了一个分析模型，分析了温度梯度区熔对枝晶间熔体显微偏析的影响。该模型考虑了包埋反应、粗化过程和固相反扩散的耦合影响。实验和理论分析均表明，在包晶凝固过程中，温度梯度区熔可加速初生相和包晶相的熔化/凝固。因此，在周晶凝固过程中，温度梯度区熔限制了枝晶间熔体的显微偏析。本文的分析模型与我们以前的模型具有内在的一致性。
Microsegregation is influenced by many factors during solicitation while the coupling effects of some important factors have been dismissed. During directional solidification of Sn–36at.%Ni peritectic alloys under high temperature gradient, melting/solidification of both the primary and peritectic phase caused by temperature gradient zone melting has been observed. An analytical model has been proposed to analyze the effect of temperature gradient zone melting on microsegregation of interdendritic melt in peritectic alloys. The coupling influences of peritectic reaction, coarsening process and solid state back-diffusion have all been included in this model. Both the experimental and theoretical analyses have demonstrated that melting/solidification of both the primary and peritectic phase could be accelerated by temperature gradient zone melting during peritectic solidification. Thus, microsegregation of interdendritic melt is restricted by temperature gradient zone melting during peritectic solidification. The analytical model in the present work shows inherent consistence with our previous models.