The Dissolution and Supersaturation of Zn in the Sn9Zn Solder Under Current Stressing

Ting Hui Wang; Kwang Lung Lin

doi:10.1007/s11664-015-4136-3

The Dissolution and Supersaturation of Zn in the Sn9Zn Solder Under Current Stressing

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Abstract

The Sn-Zn phase diagram indicates that Sn and Zn exhibit nearly zero mutual solubility. However, this study found that Zn shows certain solubility in the Sn matrix of Sn9Zn solder under current stressing with 6000–8000 A/cm². The dissolution of the Zn crystal induced by electric current was evidenced by the diminishing of the x-ray diffraction orientation of Zn(002) and the cavity formation on the Zn crystal. The Zn concentration reaches supersaturation of 4–5 wt.% at 8000 A/cm². The dissolution behavior was further investigated with scanning electron microscopy and a focus ion beam of the specimen quenched with liquid nitrogen after current stressing. The morphologies of the cavities on the Zn crystals were examined and three dissolution mechanisms were identified.

Original language	English
Journal	Journal of Electronic Materials
DOIs	https://doi.org/10.1007/s11664-015-4136-3
Publication status	Accepted/In press - 2015 Nov 6

All Science Journal Classification (ASJC) codes

Electrical and Electronic Engineering
Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Materials Chemistry

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10.1007/s11664-015-4136-3

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title = "The Dissolution and Supersaturation of Zn in the Sn9Zn Solder Under Current Stressing",

abstract = "The Sn-Zn phase diagram indicates that Sn and Zn exhibit nearly zero mutual solubility. However, this study found that Zn shows certain solubility in the Sn matrix of Sn9Zn solder under current stressing with 6000–8000 A/cm2. The dissolution of the Zn crystal induced by electric current was evidenced by the diminishing of the x-ray diffraction orientation of Zn(002) and the cavity formation on the Zn crystal. The Zn concentration reaches supersaturation of 4–5 wt.% at 8000 A/cm2. The dissolution behavior was further investigated with scanning electron microscopy and a focus ion beam of the specimen quenched with liquid nitrogen after current stressing. The morphologies of the cavities on the Zn crystals were examined and three dissolution mechanisms were identified.",

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N2 - The Sn-Zn phase diagram indicates that Sn and Zn exhibit nearly zero mutual solubility. However, this study found that Zn shows certain solubility in the Sn matrix of Sn9Zn solder under current stressing with 6000–8000 A/cm2. The dissolution of the Zn crystal induced by electric current was evidenced by the diminishing of the x-ray diffraction orientation of Zn(002) and the cavity formation on the Zn crystal. The Zn concentration reaches supersaturation of 4–5 wt.% at 8000 A/cm2. The dissolution behavior was further investigated with scanning electron microscopy and a focus ion beam of the specimen quenched with liquid nitrogen after current stressing. The morphologies of the cavities on the Zn crystals were examined and three dissolution mechanisms were identified.

AB - The Sn-Zn phase diagram indicates that Sn and Zn exhibit nearly zero mutual solubility. However, this study found that Zn shows certain solubility in the Sn matrix of Sn9Zn solder under current stressing with 6000–8000 A/cm2. The dissolution of the Zn crystal induced by electric current was evidenced by the diminishing of the x-ray diffraction orientation of Zn(002) and the cavity formation on the Zn crystal. The Zn concentration reaches supersaturation of 4–5 wt.% at 8000 A/cm2. The dissolution behavior was further investigated with scanning electron microscopy and a focus ion beam of the specimen quenched with liquid nitrogen after current stressing. The morphologies of the cavities on the Zn crystals were examined and three dissolution mechanisms were identified.

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