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Growth kinetics of Cu-Zr

Gegner, J. and Kobold, R. and Holland-Moritz, D. and Shuleshova, O. and Bednarcik, J and Herlach, D. M. (2012) Growth kinetics of Cu-Zr. China-Germany Workshop on Microgravity and Space Life Sciences , 10. - 13. September 2012, Deutschland. (Unpublished)

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The Cu-Zr alloy system has attracted great interest due to its high glass-forming ability. Using electrostatic levitation technique we are able to undercool the melt of Cu-Zr by more than 300 K and investigate the solidification process when approaching the glass transition temperature. High- speed video recording of the crystallization event enables us to determine the velocity of the solidification front at different undercoolings. For the Cu-Zr system, we observe an unusual behavior. While for usual binary alloys, the growth velocity increases with increasing undercooling, we find for the Cu-Zr system that the growth velocity reaches a maximum around 200 K and decreases when the amount of undercooling is further increased. To determine the primary phase that occurs during solidification, we have performed in-situ x-ray diffraction measurements at the beamline BW5 at HASYLAB. We find that the unusual behavior of the growth velocity cannot be explained by phase selection during rapid solidification of the deeply uncercooled melt. Experiments in microgravity are planned onboard the international space station (ISS) to investigate the influence of convection that might play a role with regard to the small growth velocities observed for the Cu-Zr alloy system. We thank the DFG for financial support by grant HE1601/26.

Item URL in elib:https://elib.dlr.de/78709/
Document Type:Conference or Workshop Item (Speech)
Title:Growth kinetics of Cu-Zr
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Shuleshova, O.Institute for complex materials, IFW DresdenUNSPECIFIEDUNSPECIFIED
Date:September 2012
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Cu-Zr, phase selection, growth velocity
Event Title:China-Germany Workshop on Microgravity and Space Life Sciences
Event Location:Deutschland
Event Type:Workshop
Event Dates:10. - 13. September 2012
Organizer:Chinese Academy of Sciences (CAS), Chinese National Space Administration (CNSA), German Aerospace Center (DLR), Ludwig-Maximilians-Universität München (LMU Munich), National Microgravity Laboratory/CAS (NML/CAS)
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:21 Nov 2012 08:26
Last Modified:21 Nov 2012 08:26

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