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Effects of In Content on the Microstructure and Mechanical Properties of In–Bi Alloys During Isothermal Aging

1
Joining and Welding Research Institute, Osaka University, 11-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
2
Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
3
Connected Solutions Company, Panasonic Corporation, 1-15 Matsuo-cho, Kadoma, Osaka 571-8504, Japan
*
Author to whom correspondence should be addressed.
Metals 2019, 9(5), 548; https://doi.org/10.3390/met9050548
Received: 3 April 2019 / Revised: 30 April 2019 / Accepted: 7 May 2019 / Published: 10 May 2019
PDF [3118 KB, uploaded 10 May 2019]

Abstract

Bulk In–Bi binary alloys with 50, 40, 33.7, and 30 mass% Bi and low melting temperatures were prepared and aged at 40 °C for 168, 504, and 1008 h in an oil bath. Tensile tests were performed on the bulk alloys, followed by fracture surface analysis of the tensile test samples. The effect of In content on the microstructures and mechanical properties of the alloys during thermal aging was analyzed. Ultimately, the tensile strength of the In–Bi alloys was found to decrease with aging time, while the elongation of the In–Bi alloys increased after thermal aging. The results of the tensile tests indicate that a higher In content improved the ductility of the In–Bi alloys significantly and reduced their strength. In addition, the fracture surfaces exhibited ductile fractures in the neck shapes. A comparative analysis of the microstructure and mechanical properties of the aforementioned alloys during thermal aging was also conducted.
Keywords: flexible electronics; In–Bi alloys; low-melting temperature; thermal aging; microstructure; mechanical properties; fracture modes flexible electronics; In–Bi alloys; low-melting temperature; thermal aging; microstructure; mechanical properties; fracture modes
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Jin, S.; Mokhtari, O.; Kanayama, S.; Nishikawa, H. Effects of In Content on the Microstructure and Mechanical Properties of In–Bi Alloys During Isothermal Aging. Metals 2019, 9, 548.

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