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Free dendritic tip growth velocities measured in Al-Ge

Becker, Maike and Klein, Stefan and Kargl, Florian (2018) Free dendritic tip growth velocities measured in Al-Ge. Physical Review Materials, 2, 073405. American Physical Society. doi: 10.1103/PhysRevMaterials.2.073405. ISSN 2475-9953.

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Official URL: https://journals.aps.org/prmaterials/abstract/10.1103/PhysRevMaterials.2.073405

Abstract

We determine the tip growth velocities of equiaxed dendrites in an Al-24 at. % Ge alloy using in situ x-ray radiography. The tip growth velocity is a main characteristic of dendritic growth and allows for an accurate comparison against theories and simulations describing the growth of a single dendrite tip or an array of dendrites. The disk-shaped samples are 200 or 350 um thin and are positioned horizontally in a near-isothermal furnace to suppress buoyancy and gravity-driven melt flows. We obtain a large data set of free dendritic tip growth velocities of Al dendrites over one order of magnitude (4-140 um s -1 ) and over a decade of global undercooling (1-10 K). No indications for a significant deviation from three-dimensional growth kinetics due to the sample confinement are found.

Item URL in elib:https://elib.dlr.de/121247/
Document Type:Article
Title:Free dendritic tip growth velocities measured in Al-Ge
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Becker, MaikeMaike.Becker (at) dlr.deUNSPECIFIED
Klein, StefanStefan.Klein (at) dlr.deUNSPECIFIED
Kargl, Florianflorian.kargl (at) dlr.deUNSPECIFIED
Date:30 July 2018
Journal or Publication Title:Physical Review Materials
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:2
DOI :10.1103/PhysRevMaterials.2.073405
Page Range:073405
Publisher:American Physical Society
ISSN:2475-9953
Status:Published
Keywords:X-ray radiography, equiaxed dendrite growth, solidification, in-situ, dendrite tip growth velocities
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 - Material Design and New Materials, 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:01 Aug 2018 09:20
Last Modified:06 Sep 2019 14:49

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