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Investigation of solidification dynamics of Zr-based alloys

Kobold, Raphael and Herlach, Dieter M. (2013) Investigation of solidification dynamics of Zr-based alloys. Frühjahrstagung Sektion Kondensierte Materie der DPG, 10. - 15. March 2013, Regensburg. (Unpublished)

Full text not available from this repository.

Abstract

In contrast to experiments with most undercooled binary alloys the velocity of dendritic growth of a Cu50Zr50 alloy does not increase monotonically with undercooling but passes through a maximum and then decreases. To study this behaviour we investigate Zr-based alloys such as CuZr, NiZr and NiZrAl with Zirconium concentrations ranging from 36 to 64 at.% including eutectic and intermetallic phases. We use electrostatic levitation technique to melt and undercool samples with a diameter of 2-3 mm under ultra-high-vacuum conditions. Containerless processing is an effective tool for undercooling metallic melts far below their equilibrium melting temperatures since heterogeneous nucleation on container walls is completely avoided. During crystallisation of the undercooled melt the heat of crystallisation is released. The rapid increase of the temperature at the solid-liquid interface makes the solidification front visible. The velocities of the solidification front are recorded by using a high-speed camera with a maximum rate of 50.000 frames per second and are analyzed with a software for optical ray tracing. Furthermore, we try to model the growth velocity vs. the undercooling temperature and perform sample EBSD analysis with a scanning electron microscope. This project is funded by Deutsche Forschungsgemeinschaft, under grant HE1601/26-1.

Item URL in elib:https://elib.dlr.de/81736/
Document Type:Conference or Workshop Item (Speech)
Title:Investigation of solidification dynamics of Zr-based alloys
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kobold, Raphaelraphael.kobold (at) dlr.deUNSPECIFIED
Herlach, Dieter M.dieter.herlach (at) dlr.deUNSPECIFIED
Date:14 March 2013
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Unpublished
Keywords:Undercooling of Materials
Event Title:Frühjahrstagung Sektion Kondensierte Materie der DPG
Event Location:Regensburg
Event Type:international Conference
Event Dates:10. - 15. March 2013
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 - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Materialwissenschaftliche Forschung (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Herlach, Dieter
Deposited On:26 Mar 2013 10:32
Last Modified:26 Mar 2013 10:32

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