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Investigation of solidification in undercooled Al-rich Al-Ni alloy systems

Ehlen, G. J. and Herlach, D. M. (2012) Investigation of solidification in undercooled Al-rich Al-Ni alloy systems. IOP Publishing. International Conference on Modelling of Casting and Advanced Solidification Processes (MCWASP XIII), 17.-22. Juni 2012, Schladming, Österreich. ISSN 1757-8981.

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Official URL: http://iopscience.iop.org/1757-899X/33/1/012066/


Dendrite growth velocities as a function of undercooling on the Al-rich side of the Al-Ni system have recently been measured by electromagnetic levitation. They have shown an anomalous behaviour, which so far cannot be theoretically described. The present work investigates whether properties of the phase diagram could explain this effect. For this purpose two simplified qualitative models of sharp interface theory, one treating the forming AlNi (B2) phase as a solid-solution, one treating it as an intermetallic phase, have been developed. To treat the concentration range between 50 and 70 at% Al, sets of thermodynamical data for six different compositions have been created. Results are compared to the experimental data. In both models low undercoolings at low Ni concentrations lead to very limited velocities, because the constitutional undercooling ∆T_c overrides the kinetic undercooling ∆T_k. The experimental results for low undercoolings seem to contain an effect which cannot be described by a model of this type.

Item URL in elib:https://elib.dlr.de/80191/
Document Type:Conference or Workshop Item (Paper, Poster)
Title:Investigation of solidification in undercooled Al-rich Al-Ni alloy systems
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Ehlen, G. J.georg.ehlen (at) dlr.deUNSPECIFIED
Herlach, D. M.dieter.herlach (at) dlr.deUNSPECIFIED
Date:June 2012
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:012066
EditorsEmailEditor's ORCID iD
Ludwig, Andreasandreas.ludwig@unileoben.ac.atUNSPECIFIED
Wu, Menghuaimenghuai.wu@unileoben.ac.atUNSPECIFIED
Kharicha, Abdellahabdellah.kharicha@unileoben.ac.atUNSPECIFIED
Publisher:IOP Publishing
Series Name:IOP Conference Series: Materials Science and Engineering
Keywords:solidification, anomal growth behaviour, intermetallics, Ni-Al
Event Title:International Conference on Modelling of Casting and Advanced Solidification Processes (MCWASP XIII)
Event Location:Schladming, Österreich
Event Type:international Conference
Event Dates:17.-22. Juni 2012
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Research under Space Conditions
DLR - Research theme (Project):R - Vorhaben Materialforschung unter Mikro-g (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Ehlen, Georg
Deposited On:27 Dec 2012 11:19
Last Modified:27 Dec 2012 11:19

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