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Mechanism of anomalous eutectic formation in the solidification of undercooled Ni–Sn eutectic alloy

Published online by Cambridge University Press:  31 January 2011

J.F. Li ,
X.L. Li ,
L. Liu  and
S.Y. Lu
J.F. Li*
Affiliation:
State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
X.L. Li
Affiliation:
Key Laboratory of Ministry of Education for High Temperature Materials and Tests, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
L. Liu
Affiliation:
State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
S.Y. Lu
Affiliation:
State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Anomalous eutectics in the solidification structure of undercooled Ni–18.7 at.% Sn eutectic alloy were examined by optical metallography and electron backscattered diffraction. It was revealed that α–Ni particulates are, in principle, randomly distributed in the anomalous eutectics in the undercooling range investigated. Another eutectic phase, β–Ni3Sn, is well orientated at low undercoolings but gradually becomes inconsistent in orientation as undercooling increases, accompanied by an increasing number of grain boundaries in it. As the solidification structure changes from a mixture of anomalous eutectics plus lamellar eutectics to full anomalous eutectics beyond a critical undercooling of 130 K, however, misorientation in the β–Ni3Sn phase disappears completely from the measurement area. Partial remelting of the primary solid was proposed to be the origin of the anomalous eutectic formation, and quantitative analyses were performed.

Keywords

MicrostructureNucleation & growthRapid solidification
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 8 , August 2008 , pp. 2139 - 2148
Copyright
Copyright © Materials Research Society 2008

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References

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