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Formation of intermetallic compounds at eutectic Sn–Zn–Al solder/Cu interface

Published online by Cambridge University Press:  31 January 2011

Shan-Pu Yu ,
Moo-Chin Wang  and
Min-Hsiung Hon
Shan-Pu Yu
Affiliation:
Department of Materials Science and Engineering, National Cheng Kung University, 1 Ta-Hsueh Road, Tainan, 80782, Taiwan
Moo-Chin Wang
Affiliation:
Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, 415 Chien-Kung Road, Kaohsiung, 80782, Taiwan
Min-Hsiung Hon
Affiliation:
Department of Materials Science and Engineering, National Cheng Kung University, 1 Ta-Hsueh Road,Tainan, 80782, Taiwan
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Abstract

The eutectic Sn–Zn–Al solder alloy was used [composition: 91Sn–9(5Al–Zn)] to investigate the intermetallic compounds (IMCs) formed between solder and a Cu substrate. Scanning electron microscope, transmission electron microscope, and electron diffraction analysis were used to study the IMCs between solder and a Cu substrate. The γ–Cu5Zn8 and γ–Cu9Al4 IMCs were found at the Sn–Zn–Al/Cu interface. Thermodynamic calculation can explain the formation of γ–Cu5Zn8 and γ–Cu9Al4 IMCs instead of Cu–Sn compounds. The formation and growth of γ–Cu9Al4 IMC at 423 K resulted in the decrease of adhesion strength at the interface of solder and a Cu substrate, where the Kirkendall voids were severely formed. As the heating time increased up to 1000 h at 423 K, the adhesion strength between the eutectic Sn–Zn–Al solder and a Cu substrate decreased from 7.6 ± 0.7 MPa to 4.4 ± 0.8 MPa.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 1 , January 2001 , pp. 76 - 82
Copyright
Copyright © Materials Research Society 2001

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