Mullis, AM, Clopet, CR and Cochrane, RF (2014) Determination of the origin of anomalous eutectic structures from in-situ observation of recalescence behaviour. Materials Science Forum, 790-79. 349 - 354. ISSN 0255-5476
Abstract
A melt encasement (fluxing) method has been used to undercool Ag-Cu alloy at its eutectic composition. The recalescence of the undercooled alloy has been filmed at high frame rate. At low undercooling lamellar eutectic is observed to grow, giving way to a mixed anomalouslamellar structure at higher undercooling. In situ observation of the spot brightness reveals, as expected, that the lamellar eutectic grows via a planar front mechanism, while the anomalous eutectic grows via a more complex process characterised by a double recalescence. The first recalescence is non-space-filling (dendritic) in character and is followed shortly afterwards by a second recalescence which appears to be of the planar front type. Moreover, the first recalescence event appears to be to a temperature in excess of the equilibrium eutectic temperature. This is strongly suggestive that the anomalous eutectic morphology arises due to the growth and subsequent partial remelting of a dendritic morphology, probably a two-phase (eutectic) dendrite, followed by planar front growth of a lamellar eutectic into the residual liquid.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | (c) 2014, Trans Tech Publications. This is an author produced version of a paper published in Materials Science Forum. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Eutectic Solidification; In Situ Imaging; Rapid Solidification,; Undercooling |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) > Institute for Materials Research (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 29 Jul 2014 10:43 |
Last Modified: | 19 Jan 2018 17:10 |
Published Version: | http://dx.doi.org/10.4028/www.scientific.net/MSF.7... |
Status: | Published |
Publisher: | Trans Tech Publications |
Identification Number: | 10.4028/www.scientific.net/MSF.790-791.349 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:79859 |