Wayne
Yes, what you say is the same thing as my findings indicate. Since alloys with a high contents of Sn creep slower than SnPb and fatigue is strain driven the lead free alloys perform better in accelerated thermal cycling tests. However, the difference in reliability between SnPb and lead free alloys gets smaller as soon as the dwell times get longer or the upper temperature of the cycle is increased.
Best regards
Guenter
Guenter Grossmann
Swiss Federal Institute for Materials Testing and Research EMPA
Centre for Reliability
8600 Duebendorf
Switzerland
Phone: xx41 1 823 4279
Fax : xx41 1823 4054
mail: [log in to unmask]
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