2005 Volume 46 Issue 12 Pages 3073-3076
The viscoplastic properties of the Sn-rich phase and Sn–Ag–Cu eutectic constituent in a Sn–3.5Ag–0.75Cu lead-free solder were determined by performing microindentation tests on these individual phases. Material parameters in Norton’s law for each phase were successfully identified by fitting the experimentally obtained rate-dependent indentation load (P) vs penetration-depth (h) curves, as well as indentation-creep data, with the corresponding Finite Element (FE) simulation results. For this material parameter identification, an appropriate indenter-penetration depth for a given size of a phase, where the P–h response is not affected by the other neighboring phases, was determined by FE simulation.
