Ductile Fracture Mechanism of Low-Temperature In-48Sn Alloy Joint Under High Strain Rate Loading
Abstract:The failure behaviors of In–48Sn solder ball joints under various strain rate loadings were investigated with both experimental and finite element modeling study. The bonding force of In–48Sn solder on an Ni plated Cu pad increased with increasing shear speed, mainly due to the high strain-rate sensitivity of the solder alloy. In contrast to the cases of Sn-based Pb-free solder joints, the transition of the fracture mode from a ductile mode to a brittle mode was not observed in this solder joint system due to the soft nature of the In–48Sn alloy. This result is discussed in terms of the relationship between the strain-rate of the solder alloy, the work-hardening effect and the resulting stress concentration at the interfacial regions.
Document Type: Research Article
Publication date: April 1, 2012
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