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Competition between stable and metastable eutectic growth in Sn-Ni alloys
File(s)
ACCEPTED VERSION.pdf (3.4 MB)
Accepted version
Author(s)
Hou, Ning
Belyakov, Sergey
Pay, Leon
Sugiyama, Akira
Yasuda, Hideyuki
Type
Journal Article
Abstract
Metastable Sn-NiSn4 eutectic can form in electronic solder joints and is a reliability concern. Here the competition between stable Sn-Ni3Sn4 and metastable Sn-NiSn4 eutectic growth is studied during unidirectional solidification. The stable and metastable eutectic points are measured, the dynamics of eutectic growth and the transition between the two eutectics is investigated by synchrotron radiography, and the crystallography of eutectic growth is measured by EBSD. It is shown that the Sn-Ni3Sn4 eutectic has a highly irregular morphology with diverging and converging rods because monoclinic Ni3Sn4 grows only along [010] without a reproducible orientation relationship (OR) with Sn. The metastable Sn-NiSn4 eutectic has a more regular broken-lamellar morphology and a reproducible OR with Sn. The critical velocity between the two eutectics is less than 1 μm/s which is discussed in terms of the small temperature difference between the two eutectic points and the kinetic growth advantages of the metastable eutectic.
Date Issued
2018-05-01
Date Acceptance
2018-02-13
Citation
Acta Materialia, 2018, 149, pp.119-131
URI
DOI
ISSN
1359-6454
Publisher
Elsevier
Start Page
119
End Page
131
Journal / Book Title
Acta Materialia
Volume
149
Copyright Statement
© 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Nihon Superior Co Ltd
Grant Number
EP/M002241/1
N/A
Subjects
Science & Technology
Technology
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Materials Science
Directional solidification
Eutectic
Phase diagram
Alloys
X-ray radiography
C-X EUTECTICS
FE-C
UNIDIRECTIONAL SOLIDIFICATION
HETEROGENEOUS NUCLEATION
NISN4 FORMATION
PHASE-DIAGRAMS
REFINEMENT
TRANSITION
INTERFACE
SELECTION
0912 Materials Engineering
0913 Mechanical Engineering
Materials
Publication Status
Published
Date Publish Online
2018-02-21