The at-temperature mechanical properties of lead-tin based alloys

Abstract

The mechanical properties (elastic modulus, yield point, ultimate tensile strength, and elongation) of five Pb-Sn solder alloys (63Sn/37Pb, 62Sn/36Pb/2Ag, 96Sn/4Ag, 5Sn/95Pb, and 10Sn/90Pb) commonly used in electronic packaging have been determined over the temperature range of-200 to 150°C using uniaxial tensile test and an acoustic pulse method. It was found that the elastic moduli measured acoustically were 10 to 30 times greater than those measured mechanically, however, it is believed that the viscoelastic response of the materials may make the uniaxial tension test inaccurate for these types of alloys.