Current induced rapid phase transformation in Au/Sn reaction couple

Tsung Chieh Chiu; Kwang Lung Lin

doi:10.1016/j.jallcom.2017.04.074

Current induced rapid phase transformation in Au/Sn reaction couple

Tsung Chieh Chiu, Kwang Lung Lin

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

The phase evolution as well as microstructural change of thin film Au/Sn reaction couple was investigated at room temperature with respect to 1.0 × 10⁴ A/cm² of current stressing. Transmission electron microscopy (TEM) equipped with nano beam electron diffraction (NBED) and energy dispersive X-ray spectrometer (EDS) revealed the fully conversion of Sn layer into AuSn and Au₅Sn IMCs after deposition. The rapid phase transformation of Au₅Sn to Au and AuSn, regardless of direction of electron flow, was evidenced by TEM during short time of current stressing. The electron impingement induced lattice strain of Au₅Sn higher than the offset yield limit was anticipated through in-situ XRD investigation. The lattice adjustment of Au₅Sn to AuSn due to escape of Au from Au₅Sn crystal was responsible for the phase transformation. The polarity migration of produced Au atoms from Au₅Sn crystal to the anode gave rise to the numerous nano voids formation at the original Au₅Sn/Au interface with forward electric current and dilution of Sn in Au layer with reverse current stressing.

Original language	English
Pages (from-to)	111-120
Number of pages	10
Journal	Journal of Alloys and Compounds
Volume	712
DOIs	https://doi.org/10.1016/j.jallcom.2017.04.074
Publication status	Published - 2017

All Science Journal Classification (ASJC) codes

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.jallcom.2017.04.074

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title = "Current induced rapid phase transformation in Au/Sn reaction couple",

abstract = "The phase evolution as well as microstructural change of thin film Au/Sn reaction couple was investigated at room temperature with respect to 1.0 × 104 A/cm2 of current stressing. Transmission electron microscopy (TEM) equipped with nano beam electron diffraction (NBED) and energy dispersive X-ray spectrometer (EDS) revealed the fully conversion of Sn layer into AuSn and Au5Sn IMCs after deposition. The rapid phase transformation of Au5Sn to Au and AuSn, regardless of direction of electron flow, was evidenced by TEM during short time of current stressing. The electron impingement induced lattice strain of Au5Sn higher than the offset yield limit was anticipated through in-situ XRD investigation. The lattice adjustment of Au5Sn to AuSn due to escape of Au from Au5Sn crystal was responsible for the phase transformation. The polarity migration of produced Au atoms from Au5Sn crystal to the anode gave rise to the numerous nano voids formation at the original Au5Sn/Au interface with forward electric current and dilution of Sn in Au layer with reverse current stressing.",

author = "Chiu, {Tsung Chieh} and Lin, {Kwang Lung}",

note = "Funding Information: The authors would like to thank the Ministry of Science and Technology, Taiwan, for the financial support of the study under grant MOST 104-2221-E-006-028-MY3. Publisher Copyright: {\textcopyright} 2017 Elsevier B.V.",

year = "2017",

doi = "10.1016/j.jallcom.2017.04.074",

language = "English",

volume = "712",

pages = "111--120",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

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T1 - Current induced rapid phase transformation in Au/Sn reaction couple

AU - Chiu, Tsung Chieh

AU - Lin, Kwang Lung

N1 - Funding Information: The authors would like to thank the Ministry of Science and Technology, Taiwan, for the financial support of the study under grant MOST 104-2221-E-006-028-MY3. Publisher Copyright: © 2017 Elsevier B.V.

PY - 2017

Y1 - 2017

N2 - The phase evolution as well as microstructural change of thin film Au/Sn reaction couple was investigated at room temperature with respect to 1.0 × 104 A/cm2 of current stressing. Transmission electron microscopy (TEM) equipped with nano beam electron diffraction (NBED) and energy dispersive X-ray spectrometer (EDS) revealed the fully conversion of Sn layer into AuSn and Au5Sn IMCs after deposition. The rapid phase transformation of Au5Sn to Au and AuSn, regardless of direction of electron flow, was evidenced by TEM during short time of current stressing. The electron impingement induced lattice strain of Au5Sn higher than the offset yield limit was anticipated through in-situ XRD investigation. The lattice adjustment of Au5Sn to AuSn due to escape of Au from Au5Sn crystal was responsible for the phase transformation. The polarity migration of produced Au atoms from Au5Sn crystal to the anode gave rise to the numerous nano voids formation at the original Au5Sn/Au interface with forward electric current and dilution of Sn in Au layer with reverse current stressing.

AB - The phase evolution as well as microstructural change of thin film Au/Sn reaction couple was investigated at room temperature with respect to 1.0 × 104 A/cm2 of current stressing. Transmission electron microscopy (TEM) equipped with nano beam electron diffraction (NBED) and energy dispersive X-ray spectrometer (EDS) revealed the fully conversion of Sn layer into AuSn and Au5Sn IMCs after deposition. The rapid phase transformation of Au5Sn to Au and AuSn, regardless of direction of electron flow, was evidenced by TEM during short time of current stressing. The electron impingement induced lattice strain of Au5Sn higher than the offset yield limit was anticipated through in-situ XRD investigation. The lattice adjustment of Au5Sn to AuSn due to escape of Au from Au5Sn crystal was responsible for the phase transformation. The polarity migration of produced Au atoms from Au5Sn crystal to the anode gave rise to the numerous nano voids formation at the original Au5Sn/Au interface with forward electric current and dilution of Sn in Au layer with reverse current stressing.

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SN - 0925-8388

VL - 712

SP - 111

EP - 120

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

ER -

Current induced rapid phase transformation in Au/Sn reaction couple

Abstract

All Science Journal Classification (ASJC) codes

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