The contribution of constitutional supercooling to nucleation and grain formation

StJohn, D. H., Prasad, A., Easton, M. A. and Qian, M. (2015) The contribution of constitutional supercooling to nucleation and grain formation. Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science, 46 11: 4868-4885. doi:10.1007/s11661-015-2960-y


Author StJohn, D. H.
Prasad, A.
Easton, M. A.
Qian, M.
Title The contribution of constitutional supercooling to nucleation and grain formation
Journal name Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science   Check publisher's open access policy
ISSN 1073-5623
1543-1940
Publication date 2015-05-20
Sub-type Article (original research)
DOI 10.1007/s11661-015-2960-y
Volume 46
Issue 11
Start page 4868
End page 4885
Total pages 18
Place of publication New York, NY, United States
Publisher Springer New York
Collection year 2016
Language eng
Formatted abstract
The concept of constitutional supercooling (CS) including the term itself was first described and discussed qualitatively by Rutter and Chalmers in order to understand the formation of cellular structures during the solidification of tin, and then quantified by Tiller et al. On that basis, Winegard and Chalmers further considered ‘supercooling and dendritic freezing of alloys’ where they described how CS promotes the heterogeneous nucleation of new crystals and the formation of an equiaxed zone. Since then the importance of CS in promoting the formation of equiaxed microstructures in both grain refined and unrefined alloys has been clearly revealed and quantified. This paper describes our current understanding of the role of CS in promoting nucleation and grain formation. It also highlights that CS, on the one hand, develops a nucleation-free zone surrounding each nucleated and growing grain and, on the other hand, protects this grain from readily remelting when temperature fluctuations occur due to convection. Further, due to the importance of the diffusion field that generates CS, recent analytical models are evaluated and compared with a numerical model. A comprehensive description of the mechanisms affecting nucleation and grain formation and the prediction of grain size is presented with reference to the influence of the casting conditions applied during the practical casting of an alloy.
Keyword Alloys
Supercooling
Nucleation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2016 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 5 times in Thomson Reuters Web of Science Article | Citations
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