Thanks Guenter for the great info!
Looking at the graphs that you sent:
Is there a time in the deformation of the solder under shear stress that
one should be concerned with fracture (i.e. when the deformation of the
solder is dominated by dislocation climb, or perhaps at a certain %GBS)?

Is there a %GBS that would indicate a sufficient shift in the
deformation mode to DC such that the solder could be characterized under
the assumption that superplasticity is no longer an issue?
Thanks again for the help.

Breton Fleming.
Junior Engineer
Newbridge Networks

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