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New evidence for the dual origin of anomalous eutectic structures in undercooled Ni–Sn alloys: In situ observations and EBSD characterization

Yang, C. and Gao, J. and Zhang, Y. K. and Kolbe, M. and Herlach, D. M. (2011) New evidence for the dual origin of anomalous eutectic structures in undercooled Ni–Sn alloys: In situ observations and EBSD characterization. Acta Materialia, 59, pp. 3915-3926. Elsevier. DOI: 10.1016/j.actamat.2011.03.016 ISSN 1359-6454

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

Abstract

Rapid solidification processes of glass-fluxed Ni81.3Sn18.7 eutectic alloys at various undercoolings were observed in situ using a highspeed camera. The microstructure of the samples was characterized using optical microscopy, scanning electron microscopy and electron back-scattering diffraction analysis. It was found that the recalescence front sweeps the sample surface from one side to the other, which coincides with the formation of a directional solidification microstructure. Such a finding suggests that it is feasible to measure crystal growth velocities in the undercooled liquid by tracking the loci of the recalescence front. The measured data show sudden acceleration of crystal growth kinetics at a medium undercooling, giving evidence for a transition from coupled growth to uncoupled growth. Microscopic studies revealed that the sample with an undercooling of 202 K comprises two types of anomalous eutectic, which are distinguished by the size and orientations of Ni-rich grains. The results verify a recent hypothesis that anomalous eutectic in undercooled Ni–Sn alloys has a dual origin: it results from eutectic dendrites growing at low undercoolings and from single-phase Ni-rich dendrites growing at high undercoolings.

Item URL in elib:https://elib.dlr.de/69688/
Document Type:Article
Title:New evidence for the dual origin of anomalous eutectic structures in undercooled Ni–Sn alloys: In situ observations and EBSD characterization
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Yang, C.Key Lab of Electromagnetic Processing of Materials, Northeastern University Shenyang, ChinaUNSPECIFIED
Gao, J.Key Lab of Electromagnetic Processing of Materials, Northeastern University Shenyang, ChinaUNSPECIFIED
Zhang, Y. K.Key Lab of Electromagnetic Processing of Materials, Northeastern University Shenyang, ChinaUNSPECIFIED
Kolbe, M.matthias.kolbe (at) dlr.de, Institut für Materialphysik im Weltraum, DLRUNSPECIFIED
Herlach, D. M.Institut für Materialphysik im Weltraum, DLRUNSPECIFIED
Date:2011
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:59
DOI :10.1016/j.actamat.2011.03.016
Page Range:pp. 3915-3926
Publisher:Elsevier
ISSN:1359-6454
Status:Published
Keywords:eutectic alloys, undercooling, anomalous eutectic, in situ observations, EBSD
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W FR - Forschung unter Weltraumbedingungen (old)
DLR - Research area:Space
DLR - Program:W FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):W - Vorhaben Materialforschung unter Mikro-g (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Kolbe, Matthias
Deposited On:03 May 2011 08:27
Last Modified:26 Mar 2013 13:28

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