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

Kargl, Florian (2018) Equiaxed dendrite growth in non-refined Al-base alloys in real-time. 10 Years ICAMS International Symposium, 25-27 Jun 2018, Bochum, Germany.

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Abstract

Dendritic structures are very common in metallic metals produced by solidification. The developing grain morphologies and the growth dynamics characterize the final microstructure of an alloy. We study the evolution and growth morphologies of dendrites using in-situ X-ray radiography and post-mortem electron backscatter diffraction (EBSD). The growth velocities of the dendrite tips and the change of solute composition in the extra-dendritic liquid in thin (< 0.5 mm) alloy samples are monitored in real-time. The experimentally determined tip velocities are compared to growth models that predict dendritic tip growth. The orientations of the solidified dendrites are analyzed post-mortem using EBSD. We observe different dendrite orientations in Al-Ge and Al-Cu alloys. Dendrites in Al-Cu alloys grow along the crystallographic <100> direction, whereas dendrites in Al-Ge alloys show variable growth directions. We find an influence of germanium content on the selected dendrite orientiations.

Item URL in elib:https://elib.dlr.de/125688/
Document Type:Conference or Workshop Item (Lecture)
Title:Equiaxed dendrite growth in non-refined Al-base alloys in real-time
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kargl, Florianflorian.kargl (at) dlr.deUNSPECIFIED
Date:2018
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:X-ray radiography, scanning electron microscopy, solidification, equiaxed dendrite growth
Event Title:10 Years ICAMS International Symposium
Event Location:Bochum, Germany
Event Type:international Conference
Event Dates:25-27 Jun 2018
Organizer:Ruhr University Bochum, ICAMS
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 Materialdesign und neue Materialien
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 10:53
Last Modified:08 Jan 2019 10:53

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