Mullis, A orcid.org/0000-0002-5215-9959 and Haque, N (2019) Direct observation of dendrite fragmentation in the solidification of undercooled melts. In: Gandin, C-A and Wu, M, (eds.) IOP Conference Series : Materials Science and Engineering. 5th International Conference on Advances in Solidification Processes (ICASP-5)., 17-21 Jun 2019, Salzburg. IOP Publishing
Abstract
The fragmentation of dendrites immediately following the recalescence phase of growth during the solidification of undercooled melts has been invoked to explain various rapid solidification microstructures. Despite this, little direct evidence of such a fragmentation process usually survives in the as-solidified material. We report on the rapid solidification of the single phase, congruently melting intermetallic beta-Ni3Ge. During equilibrium solidification this material solidifies to the chemically ordered L12 crystal structure. Conversely, during rapid solidification, disorder trapping results in solidification to a random fcc solid solution, thereby providing a means to distinguish the rapidly solidified structures. We present results which show a range of microstructures in which the dendrite fragmentation process has been captured in progress. Results from EBSD Euler mapping reveal that dendrite fragmentation is a potential, but not particularly efficient, route to grain refinement.
Metadata
Item Type: | Proceedings Paper |
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Authors/Creators: |
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Editors: |
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Copyright, Publisher and Additional Information: | Published under licence by IOP Publishing Ltd. This is an open access article under the terms of the Creative Commons Attribution 3.0 licence. |
Keywords: | Dendritic growth; Intermetallic; Rapid solidification |
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) |
Depositing User: | Symplectic Publications |
Date Deposited: | 11 Jun 2019 13:11 |
Last Modified: | 25 Jun 2023 21:51 |
Status: | Published |
Publisher: | IOP Publishing |
Identification Number: | 10.1088/1757-899X/529/1/012020 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:147086 |