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Transmission electron microscopy (TEM) observations were carried out to investigate the microstructural evolution of SnBi/single crystal (100) Cu interface during reflow and solid-state aging process. It was found that there were two kinds of IMCs, Cu6Sn5 and Cu3Sn, at the interface after reflow. The Cu3Sn grains grew along [100] direction of Cu with columnar morphology. During aging, new triangle...
The microstructures of SnBi/Cu interconnect after reflow and its evolution during solid-state aging at 393 K were investigated using transmission electron microscopy (TEM). It was found that after reflow there were two kinds of intermetallic compounds (IMCs) - Cu6Sn5 and Cu3Sn in solder joint. Above these IMC layers there was a Bi-rich layer which consisted of discontinuous Bi particles. During solid...
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