Fatigue Behavior of Solders Used in Flip-Chip Technology

    Volume 1, Issue 2 (March 1973)

    ISSN: 0090-3973

    CODEN: JTEOAD

    Page Count: 9


    Rathore, HS
    Senior associate engineer, development engineer, and staff engineer, International Business Machines, System Products Division, East Fishkill, New York

    Yih, RC
    Senior associate engineer, development engineer, and staff engineer, International Business Machines, System Products Division, East Fishkill, New York

    Edenfeld, AR
    Senior associate engineer, development engineer, and staff engineer, International Business Machines, System Products Division, East Fishkill, New York

    Abstract

    This paper surveys the mechanical fatigue behavior of 5/95 Sn/Pb solder and solder with copper, silver and palladium impurities at different temperatures and on-off cycling frequencies. Presence of copper in 5/95 Sn/Pb creates hard and relatively brittle intermetallics which also significantly decrease the fatigue life of solder. The fatigue cracks were observed to propagate through grain boundaries, although some slip striations were observed within individual grains. There is a significant decrease in the fatigue life of 5/95 Sn/Pb in the temperature range of 85 C to 150 C. The fatigue life of solder decreases with a decrease in cycling frequency. Results have shown that the frequency exponent is equal to ⅕. Cyclic strain softening was observed in the specimens which were tested under constant total strain control conditions.


    Paper ID: JTE10895J

    DOI: 10.1520/JTE10895J

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    Author
    Title Fatigue Behavior of Solders Used in Flip-Chip Technology
    Symposium , 0000-00-00
    Committee E08