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Evaluation of the Impact Shear Strength of Thermal Aged Lead-Free Solder Ball Joints
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 Title & Authors
Evaluation of the Impact Shear Strength of Thermal Aged Lead-Free Solder Ball Joints
Chung, Chin Sung; Kim, Ho Kyung;
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The present study investigates the impact shear strength of thermal aged Sn-3Ag-0.5Cu lead-free solder joints at impact speeds ranging from 0.5 m/s to 2.5 m/s. The specimens were thermal aged for 24, 100, 250 and 1000 hours at . The experimental results demonstrate that the shear strength of the solder joint decreases with an increase in the load speed and aging time. The shear strength of the solder joint aged averagely decreased by 43% with an increase in the strain rate. For the as-reflowed specimens, the mode II stress intensity factor () of interfacial IMC between Sn-3.0Ag-0.5Cu and a copper substrate also was found to decrease from to in the speed range tested here. The degradations in the shear strength and fracture toughness of the aged solder joints are mainly caused by the growth of IMC layers at the solder/substrate interface.
impact shear strength;lead-free solder joint;interface failure;thermal aging;fracture toughness;
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