Influence of environment on the fatigue of Pb-Sn solder joints

Author

Guo, Z. ; Sprecher, A.F. ; Jung, D.Y. ; Conrad, H.

Author_Institution

Dept. of Mater. Sci. & Eng., North Carolina State Univ., Raleigh, NC, USA

fYear

1991

fDate

11-16 May 1991

Firstpage

806

Lastpage

812

Abstract

The effect of a vacuum (~10^-6 torr) on the low-cycle fatigue life (25%, 50%, 75%, and 95% drop in load) of 10Sn90Pb and 63Sn37Pb solder joints tested in shear was investigated in total strain control (by Δγ_t=0.006 to 0.5, ν=0.1 Hz ramp cycling) at 300 K. The influence of a grease coating was also determined for the 63Sn37Pb alloy for Δγ_t=0.07 to 0.8. No clear effect of vacuum occurred for the strain range considered. However, the grease coating improved fatigue life. Possible explanations for the observed effects are given, including chemical reaction with the specimen surface, i.e. a Rhebinder effect; a crack-filling effect leading to a decrease in the stress intensity factor; and a reduction in friction along the sliding crack surfaces giving less debris and thereby a lower tensile stress at the crack tip

Keywords

environmental testing; fatigue cracks; fatigue testing; lead alloys; life testing; shear strength; soldering; tin alloys; 1×10^-6 torr; 10Sn90Pb; 300 K; 63Sn37Pb; Pb-Sn solder joints; Rhebinder effect; chemical reaction; crack-filling effect; environmental influence; friction reduction; grease coating; low-cycle fatigue life; materials testing; shear; specimen surface; stress intensity factor; tensile stress; total strain control; vacuum; Capacitive sensors; Chemicals; Coatings; Fatigue; Lead; Life testing; Soldering; Strain control; Surface cracks; Tensile stress;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronic Components and Technology Conference, 1991. Proceedings., 41st

Conference_Location

Atlanta, GA

Print_ISBN

0-7803-0012-2

Type

conf

DOI

10.1109/ECTC.1991.163972

Filename

163972