兰州大学机构库 >物理科学与技术学院
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
2021-06-10
Source PublicationJournal of Materials Science and Technology
ISSN10050302
Volume75Pages:21-26
AbstractCompared 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
KeywordAddition reactions Binary alloys Natural convection Nickel alloys Solidification Tin alloys Velocity Dendritic networks Directionally solidified Freckle formation Macrosegregations Peritectic alloys Peritectic reaction Peritectic solidification Thermosolutal convection
PublisherChinese Society of Metals
DOI10.1016/j.jmst.2020.08.067
Indexed ByEI
Language英语
EI Accession Number20204609482544
EI KeywordsPhosphorus compounds
EI Classification Number546.2 Tin and Alloys - 548.2 Nickel Alloys - 641.2 Heat Transfer - 802.2 Chemical Reactions - 802.3 Chemical Operations
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Document Type期刊论文
Identifierhttp://ir.lzu.edu.cn/handle/262010/443862
Collection物理科学与技术学院
Corresponding AuthorPeng, Peng
Affiliation1.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 AffilicationSchool of Physical Sicence and Technology;  Lanzhou University
Corresponding Author AffilicationSchool of Physical Sicence and Technology;  Lanzhou University
Recommended Citation
GB/T 7714
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.
APA 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.
MLA 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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