To study the intragranular mechanical behavior of a Sn-Ag-Cu solder, a focused ion beam system was used to manufacture a notched microspecimen at a eutectic area within a grain. A low-speed tensile test was performed on the microspecimen using an Instron 5848 microtester at room temperature. The results show that, besides an obvious shearing deformation, a large number of subgrains are formed in the β-Sn matrix. Subgrain boundaries are composed of a large number of dislocations. Besides the heterogeneous deformation due to the notch, Ag3Sn intermetallic compounds influence the evolution path of subgrain boundaries.
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Gong, J., Conway, P.P., Liu, C. et al. Heterogeneous Intragranular Inelastic Behavior of a Sn-Ag-Cu Alloy. J. Electron. Mater. 38, 2429–2435 (2009). https://doi.org/10.1007/s11664-009-0871-7
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DOI: https://doi.org/10.1007/s11664-009-0871-7