Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6945765 | Microelectronics Reliability | 2018 | 8 Pages |
Abstract
In this work, the iron (Fe) and bismuth (Bi) added (0.05â¯wt% Fe and 1â¯wt% or 2â¯wt% Bi) Sn-1Ag-0.5Cu (SAC105) lead-free solder alloys were prepared and their microstructure and tensile properties under severe thermal environments were extensively investigated and compared with the base alloy SAC105. The isothermal aging was done at 200â¯Â°C for 100â¯h, 200â¯h, and 300â¯h. Fe/Bi added SAC105 showed a significant reduction in the IMCs size (Ag3Sn and Cu6Sn5), especially the Cu6Sn5 IMCs and a refinement in the microstructure, which is due to the existence of Bi in the alloys. Moreover, the existence of Fe and Bi gives the microstructure better stability under severe thermal aging conditions. The tensile testing results showed that the addition of Fe and Bi to SAC105 greatly improves yield stress and tensile strength, but decreases ductility level, which is because of the Bi solid solution strengthening mechanism. Under severe thermal aging, the Fe/Bi added SAC105 showed more stable tensile properties, because of the existence of both Fe and Bi in the alloys.
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Authors
Bakhtiar Ali, Mohd Faizul Mohd Sabri, Suhana Mohd Said, Nazatul Liana Sukiman, Iswadi Jauhari, Mohammad Hossein Mahdavifard,