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In situ studies of liquid-liquid phase separation, solidification sequence and dendrite growth kinetics in electrostatically levitated Ti–Y alloys

Zhao, Dandan and Yang, Fan and Holland-Moritz, Dirk and Kolbe, M. and Buslaps, T. and Gao, J. (2021) In situ studies of liquid-liquid phase separation, solidification sequence and dendrite growth kinetics in electrostatically levitated Ti–Y alloys. Acta Materialia, 213, p. 116962. Elsevier. doi: 10.1016/j.actamat.2021.116962. ISSN 1359-6454.

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Official URL: http://elsevier.com/locate/actamat

Abstract

Melts of hypomontectic Ti75Y25, near-monotectic Ti70Y30 and hypermonotectic Ti60Y40 composition were undercooled and solidified using an electrostatic levitation facility. Liquid-liquid phase separation, solidification sequence and dendritic growth velocities in undercooled melts were investigated in situ using high-energy X-ray diffraction (HEXRD) and optical imaging with a high-speed video camera. HEXRD observations confirm that undercooled melts of the three Ti−Y compositions are separated into a Ti-rich liquid and a Y-rich liquid prior to solidification. The solidification sequence of the separated liquids depends on nucleation of α-Y with hcp structure from the Y-rich liquid and on nucleation of β-Ti with bcc structure from the Ti-rich liquid. Optical imaging observations suggest that the dendrite growth velocities of α-Y and β-Ti during recalescence are often time dependent and that they do not show any consistent trends with increasing nucleation undercooling. These unusual growth kinetics can be attributed to dynamic interactions between growing dendrites and droplets of a separated liquid. Scanning electron microscopy studies show that the phase-separated samples solidify into a core-shell structure or an island-and-sea-like structure. These microstructures can be understood in terms of the liquid-liquid phase separation and the droplet-dendrite interactions during solidification.

Item URL in elib:https://elib.dlr.de/143068/
Document Type:Article
Title:In situ studies of liquid-liquid phase separation, solidification sequence and dendrite growth kinetics in electrostatically levitated Ti–Y alloys
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Zhao, DandanNortheastern University, Shenyang, ChinaUNSPECIFIED
Yang, FanInstitut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und RaumfahrtUNSPECIFIED
Holland-Moritz, DirkInstitut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), 51170 Köln, GermanyUNSPECIFIED
Kolbe, M.Institut für Materialphysik im Weltraum, DLR, Köln, GermanyUNSPECIFIED
Buslaps, T.European Synchrotron Radiation Facility ESRF, Grenoble, FranceUNSPECIFIED
Gao, J.Key Lab of Electromagnetic Processing of Materials, NEU, Shenyang, ChinaUNSPECIFIED
Date:2021
Journal or Publication Title:Acta Materialia
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:213
DOI :10.1016/j.actamat.2021.116962
Page Range:p. 116962
Publisher:Elsevier
ISSN:1359-6454
Status:Published
Keywords:liquid-liquid phase separation, solidification, in situ X-ray diagnostics, microstructure
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 - Project EML3
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Kolbe, Matthias
Deposited On:14 Jul 2021 15:47
Last Modified:21 Jul 2021 12:41

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