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Wetting and interface microstructure between Sn–Zn binary alloys and Cu

Published online by Cambridge University Press:  31 January 2011

Katsuaki Suganuma ,
Koichi Niihara ,
Takeshi Shoutoku  and
Yoshikazu Nakamura
Katsuaki Suganuma*
Affiliation:
Institute of Scientific and Industrial Research, Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567, Japan
Koichi Niihara
Affiliation:
Institute of Scientific and Industrial Research, Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567, Japan
Takeshi Shoutoku
Affiliation:
Department of Materials Science and Engineering, National Defense Academy, Hashirimizu 1-10-20, Yokosuka, Kanagawa 239, Japan
Yoshikazu Nakamura
Affiliation:
Department of Materials Science and Engineering, National Defense Academy, Hashirimizu 1-10-20, Yokosuka, Kanagawa 239, Japan
*
a) Address correspondence to this author. suganuma@sanken.osaka-u.ac.jp
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Abstract

Sn–Zn binary alloys have been examined as a lead-free solder. Zn distributes in a Sn matrix as platelets. The hypoeutectic alloys show two endothermic peaks in DTA, which correspond to the eutectic and the liquidus temperatures. Three reaction layers are formed at the Sn–Zn/Cu interface without containing Sn: the thick γ–Cu5Zn8 adjacent to the solder, the thin β′–CuZn in the middle, and the thinnest layer adjacent to Cu. Although many nonwetting regions and voids are formed at the interface because of poor wetting, soldering at 290 °C can form a rigid interface, and tensile strength reaches about 40 MPa.

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Type
Articles
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Journal of Materials Research , Volume 13 , Issue 10 , October 1998 , pp. 2859 - 2865
Copyright
Copyright © Materials Research Society 1998

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References

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