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- W4362634340 abstract "We reported a phenomenon and mechanism of recrystallization evolution in solder joint under thermo-mechanical stress. Ball Grid Array samples fabricated by Sn3.0Ag0.5Cu solder were placed into the thermal cycling test chamber with a temperature range of −55 °C to 125 °C. Characterized using electron backscattered diffraction technique, three stages of recrystallization occurring in the solder joint were found to co-exist in one joint after 2500 thermal cycles. To better understand the formation of recrystallized grains during thermal cycling, especially dislocation substructures at the early stage, thin foils corresponding to different stages of the recrystallization were extracted by focus ion beam from the solder joint and analyzed by high-resolution transmission electron microscope. We summarize the recrystallization process including the annihilation of dislocation dipoles contributes to the evolution of sub-grain boundaries, and then the recrystallized grains are generated by sub-grain rotation mechanism. In addition, the recrystallized grains proceed to the subsequent same cycle until the failure of solder joint. The study provides the theoretical basis and technical support for further improving the thermo-mechanical reliability of Sn-based lead-free solder joints." @default.
- W4362634340 created "2023-04-07" @default.
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- W4362634340 date "2023-06-01" @default.
- W4362634340 modified "2023-10-06" @default.
- W4362634340 title "TEM and EBSD characterization revealing the recrystallization process occurring in the Sn-3.0Ag-0.5Cu Ball Grid Array solder joints during thermal cycling" @default.
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- W4362634340 doi "https://doi.org/10.1016/j.matchar.2023.112890" @default.
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