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09-03-2019 | Issue 8/2019

Journal of Materials Science: Materials in Electronics 8/2019

Improved mechanical properties induced by In and In & Zn double additions to eutectic Sn58Bi alloy

Journal:
Journal of Materials Science: Materials in Electronics > Issue 8/2019
Authors:
Shiqi Zhou, Yu-An Shen, Tiffani Uresti, Vasanth C. Shunmugasamy, Bilal Mansoor, Hiroshi Nishikawa
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Abstract

The effects of 0.5 wt% In as well as 0.5 wt% In and 1 wt% Zn double (In & Zn) additions to eutectic Sn58Bi alloy on the microstructure and mechanical properties were investigated. Newly designed In & Zn-added Sn58Bi alloy showed much finer microstructure than eutectic Sn58Bi and In-added Sn58Bi alloys. The elongation improvements of 36% and 41% before and after 1008 h aging were obtained in In & Zn-added Sn58Bi alloy compared to eutectic Sn58Bi alloy. Nanoindentation tests revealed that In had solid solution softening (SSS) effect on Sn phase. A hardness decrease and a large creep displacement obtained in both In- and In & Zn-added Sn58Bi served as evident of the SSS. The effects of Zn and In were combined responsible for the elongation improvement of In & Zn-added Sn58Bi.

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