|Macrosegregation and thermosolutal convection-induced freckle formation in dendritic mushy zone of directionally solidified Sn-Ni peritectic alloy|
|Peng Peng(彭鹏)1,2; Zhang, Anqiao1,2; Yue, Jinmian1,2; Zhang, XD(张旭东)1,2; Xu, YL(徐远丽)1,2|
|Source Publication||Journal of Materials Science and Technology
|Abstract||Compared with the growing applications of peritectic alloy, none research on the freckle formation during peritectic solidification has been reported before. Observation on the dendritic mushy zone of Sn-36 at.%Ni peritectic alloy during directional solidification at different growth velocities shows that the freckles are formed in two different regions: region I before peritectic reaction and region II after peritectic reaction. In addition, more freckles can be observed at lower growth velocities. Examination on the experimental results demonstrates that both the temperature gradient zone melting (TGZM) and Gibbs-Thomson (G–T) effects have obvious influences on the morphology of dendritic network during directional solidification. The current theories onKI Rayleigh number Ra characterizing the thermosolutal convection of dendritic mushy zone to predict freckle formation through the maximum of Ra can only explain the existence of region I while the appearance of region II after peritectic reaction cannot be predicted. Thus, a new Rayleigh number RaP is proposed in consideration of evolution of dendritic mushy zone by both effects and peritectic reaction. Theoretical prediction of RaP also shows a maximum after peritectic reaction in addition to that before peritectic reaction, thus, agreeing well with the freckle formation in region II. In addition, more severe thermosolutal convection can be predicted by the new Rayleigh number RaP at lower growth velocities, which further demonstrates the reliability of RaP in describing the dependence of freckle formation on growth velocity. © 2020|
|Publisher||Chinese Society of Metals
|EI Accession Number||20204609482544
|EI Keywords||Phosphorus compounds
|EI Classification Number||546.2 Tin and Alloys - 548.2 Nickel Alloys - 641.2 Heat Transfer - 802.2 Chemical Reactions - 802.3 Chemical Operations
|Corresponding Author||Peng, Peng|
|Affiliation||1.Institute of Materials Science and Engineering, Lanzhou University, Lanzhou; 730000, China;|
2.School of Physical Science and Technology, Lanzhou University, Lanzhou; 730000, China
|First Author Affilication||School of Physical Sicence and Technology; Lanzhou University
|Corresponding Author Affilication||School of Physical Sicence and Technology; Lanzhou University
Peng, Peng,Zhang, Anqiao,Yue, Jinmian,et al. Macrosegregation and thermosolutal convection-induced freckle formation in dendritic mushy zone of directionally solidified Sn-Ni peritectic alloy[J].
Journal of Materials Science and Technology,2021,75:21-26.
Peng, Peng,Zhang, Anqiao,Yue, Jinmian,Zhang, Xudong,&Xu, Yuanli.(2021).Macrosegregation and thermosolutal convection-induced freckle formation in dendritic mushy zone of directionally solidified Sn-Ni peritectic alloy.Journal of Materials Science and Technology,75,21-26.
Peng, Peng,et al."Macrosegregation and thermosolutal convection-induced freckle formation in dendritic mushy zone of directionally solidified Sn-Ni peritectic alloy".Journal of Materials Science and Technology 75(2021):21-26.
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