Internal melting and coarsening of liquid droplets in an Al-Cu alloy: a 4-D experimental study

Terzi, Sofiane, Salvo, Luc, Suery, Michel, Dahle, Arne K. and Boller, Elodie (2013) Internal melting and coarsening of liquid droplets in an Al-Cu alloy: a 4-D experimental study. Journal of Materials Science, 48 21: 7422-7434. doi:10.1007/s10853-013-7557-5


Author Terzi, Sofiane
Salvo, Luc
Suery, Michel
Dahle, Arne K.
Boller, Elodie
Title Internal melting and coarsening of liquid droplets in an Al-Cu alloy: a 4-D experimental study
Journal name Journal of Materials Science   Check publisher's open access policy
ISSN 0022-2461
1573-4803
Publication date 2013-11
Year available 2013
Sub-type Article (original research)
DOI 10.1007/s10853-013-7557-5
Volume 48
Issue 21
Start page 7422
End page 7434
Total pages 13
Place of publication New York, NY United States
Publisher Springer New York LLC
Collection year 2014
Language eng
Formatted abstract
In conventional melting experiments of pure monocrystalline metals, the phase transformation starts at the sample surface and progresses inwards according to thermal gradients. In solutionized alloys, traces of internal melting are usually observed after reheating and quenching from the semi-solid state. The formation and development of these liquid pockets are not fully understood despite their significance in semi-solid processing, where the formability is greatly influenced by the distribution of liquid within the feedstock material. In situ X-ray microtomography was performed in this study to shed light on this phenomenon. We report in detail the melting and isothermal holding of a model binary alloy where a remarkable number of liquid droplets were observed to develop and coalesce. Various computational tools have been used to study their statistical evolution as well as the local ripening mechanisms involved. We analysed an interesting case of particle coarsening which differs from classical case studies by the fact that the fast-diffusing liquid phase is entrapped within the slow-diffusing solid medium.
Keyword X Ray Microtomography
Semisolid State
Insitu
Particle Growth
Solidification
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 2014 Collection
 
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