Dynamic and creep behavior of 80In15Pb5Ag and 50Sn50Pb were studied isothermally over nine decades of time and frequency. 80In15Pb5Ag was examined at Ϫ6, 21, and 50°C, and 50Sn50Pb was examined at 21°C. Viscoelastic behavior was observed at strains less than 10 Ϫ5 as a function of temperature and time/frequency. At the small strain used in the study, the alloys exhibit linear viscoelasticity rather than the viscoplasticity observed at larger strain. Viscoelasticity was subject to constitutive modeling. The creep followed a superposition of a stretched exponential and a power law in time, and an Arrhenius form in temperature. Behavior was thermorheologically simple over at least nine decades of true time and frequency.

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