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RESEARCH PAPERS

Isothermal Fatigue of 63Sn-37Pb Solder

[+] Author and Article Information
E. C. Cutiongco, S. Vaynman, M. E. Fine

Northwestern University, Evanston, IL 60208

D. A. Jeannotte

IBM, Hopewell Junction, NY 12533

J. Electron. Packag 112(2), 110-114 (Jun 01, 1990) (5 pages) doi:10.1115/1.2904350 History: Received April 10, 1990; Online April 28, 2008

Abstract

The effects of aging, strain range, hold time at maximum strain and temperature on the isothermal fatigue life of bulk 63Sn-37Pn solder samples over the total strain range (Δ εT ) from 0.3 to 3.0 percent (tension-tension) and within the temperature range of 25° C to 100° C were studied. The cycles to failure (Nf ) were defined as the number of cycles at which the ratio of the maximum tensile stress to the maximum compressive stress starts to drop appreciably. Fatigue life increases rapidly after a day or two of aging after heat treatment at 150° C for 2 hours followed by air cooling but levels off after a week. The log of fatigue life decreases linearly with increasing log of plastic strain range above Δ εT = 0.6 percent. Hold time at maximum strain dramatically decreases the cycles to failure, however, an increase of hold time more than a few minutes eventually leads to a constant Nf . Temperature variation from 25°C to 100° C was found to have little effect on the fatigue life of the solder in tests with and without hold time. Separation of Pb-rich and Sn-rich phases and cracking of the Sn-rich phases are the main modes of fracture under all conditions used. Damage is concentrated along crisscrossing shear bands oriented approximately 45 deg to the load direction.

Copyright © 1990 by The American Society of Mechanical Engineers
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