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Equiaxed dendrite growth in non-refined Al-base alloys in real time

Kargl, Florian and Becker, Maike and Drescher, Jörg and Wegener, Mareike and Dreissigacker, C. (2018) Equiaxed dendrite growth in non-refined Al-base alloys in real time. Seventh International Conference on Solidification and Gravity, 3-6 Sep 2018, Miskolc, Lillafüred, Hungary.

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Numerical computer simulations of microstructure evolution during dendritic solidification require reliable experimental data for comparison. In the last two decades X-ray radiography was shown to be a powerful method to in real-time monitor dendritic solidification in thin samples. Here, we present data on equiaxed dendritic growth of fcc-Al dendrites in non-grain refined Al-Ge and Al-Cu alloys. The disc-shaped samples of up to 12 mm diameter and between 200 and 350 µm thickness were processed in a near-isothermal furnace at constant cooling rates of 1 to 3 K/min. We compare dendrite tip velocities determined in horizontally aligned samples on ground with data acquired during two recent microgravity experiments using DLRs X-RISE facility aboard the sounding rocket MAPHEUS. Furthermore, the evolution of solute concentration field evolution in the interdendritic liquid is measured and discussed. The velocity data are compared with theoretical dendrite growth models.

Item URL in elib:https://elib.dlr.de/125684/
Document Type:Conference or Workshop Item (Lecture)
Title:Equiaxed dendrite growth in non-refined Al-base alloys in real time
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Dreissigacker, C.Institut für Materialphysik im WeltraumUNSPECIFIEDUNSPECIFIED
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:X-ray radiography, solidification, equiaxed-dendrite growth, microgravity
Event Title:Seventh International Conference on Solidification and Gravity
Event Location:Miskolc, Lillafüred, Hungary
Event Type:international Conference
Event Dates:3-6 Sep 2018
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 - Materials Research and Microgravity (MuM)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space > Scientific Experiments MP
Deposited By: Kargl, Dr Florian
Deposited On:08 Jan 2019 10:52
Last Modified:08 Jan 2019 10:52

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