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- Title
Thermal creep and fracture behaviors of the lead-free Sn–Ag–Cu–Bi solder interconnections under different stress levels.
- Authors
Zhang, X. P.; Yin, L. M.; Yu, C. B.
- Abstract
In our previous study, the creep behavior of the lead-free Sn–Ag–Cu–Bi solder joints has been proven to follow the Arrhenius power-law relationship, and the thermal fatigue behavior of the solder joints exhibits the typical creep deformation characteristics with a superposition of the pulsating features. In this study, the thermal creep and fracture behaviors of the lead-free Sn–Ag–Cu–Bi solder interconnections were characterized under different stress levels, with a systematical comparison to that of a traditional Sn60Pb40 near-eutectic solder. The results show that the creep strain rate of both solder connections follows Weertman-Dorn equation, and the calculated creep stress exponent for two solders is reasonably close to other published data. The SEM inspection and analysis of fractographies of creep fractured solder joints manifest that the creep failure of the lead-free Sn–Ag–Cu–Bi solder joint shows obviously intergranular fracture mechanism, while the Sn60Pb40 joint ruptures dominantly by a transgranular sliding mechanism.
- Subjects
LEAD; STRAINS &; stresses (Mechanics); SOLDER &; soldering; METAL fatigue; JOINTS (Engineering); FRACTURE mechanics; FRACTOGRAPHY; COPPER; DEFORMATIONS (Mechanics)
- Publication
Journal of Materials Science: Materials in Electronics, 2008, Vol 19, Issue 4, p393
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-007-9351-0