DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Containerless Processing in the Study of Metastable Solids from Undercooled Melts

Herlach, D.M. (2013) Containerless Processing in the Study of Metastable Solids from Undercooled Melts. In: Materials Science Forum, 526, pp. 21-27. Trans Tech Publications, Switzerland. 2013 International conference on Materials Engineeering for Advanced Technologies (ICMEAT 2013), 31. Dez. 2013 - 02. Jan. 2014, Brisbane, Australien. doi: 10.4028/www.scientific.net/AMM.526.21. ISBN 978-303571208-7. ISSN 0255-5476.

Full text not available from this repository.

Official URL: http://www.scientific.net/AMM.526.21


An undercooled melt possesses an enhanced free enthalpy that enables to crystallize metastable solids in competition with their stable counterparts. Crystal nucleation selects the crystallographic phase whereas the growth dynamics controls microstructure evolution. We apply containerless processing such as electromagnetic and electrostatic levitation to containerlesss undercool and solidify metallic melts. Heterogeneous nucleation on container-walls is completely avoided leading to large undercooling with the extra benefit that the freely suspended drop is direct accessible for in situ observation of crystallization far away from equilibrium. Results of investigations of maximum undercoolability on pure zirconium are presented showing the limit of maximum undercoolability set by the onset of homogeneous nucleation. Rapid dendrite growth is measured as a function of undercooling by a high-speed camera and analysed within extended theories of non-equilibrium solidification. In such both supersaturated solid solutions and disordered superlattice structure of intermetallics are formed at high growth velocities. A sharp interface theory of dendrite growth is capable to describe the non-equilibrium solidification phenomena during rapid crystallization of deeply undercooled melts.

Item URL in elib:https://elib.dlr.de/87936/
Document Type:Conference or Workshop Item (Speech)
Title:Containerless Processing in the Study of Metastable Solids from Undercooled Melts
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:December 2013
Journal or Publication Title:Materials Science Forum
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 21-27
Publisher:Trans Tech Publications, Switzerland
Keywords:Containerless processing; Undercooling; Crystal nucleation; Dendritic growth; Supersaturated alloys; Disorder trapping; Metastable solids.
Event Title:2013 International conference on Materials Engineeering for Advanced Technologies (ICMEAT 2013)
Event Location:Brisbane, Australien
Event Type:international Conference
Event Dates:31. Dez. 2013 - 02. Jan. 2014
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 > Scientific Experiments MP
Deposited By: Gegner, Jan
Deposited On:29 Jan 2014 08:25
Last Modified:18 Jul 2023 12:36

Repository Staff Only: item control page

Help & Contact
electronic library is running on EPrints 3.3.12
Website and database design: Copyright © German Aerospace Center (DLR). All rights reserved.