Effect of Ag on the Mechanical Properties of Bi-Ag Solder Alloys by the Single-Lap Shear Test Method

摘要

Due to the toxicity of Pb in the soldering alloys, new alloys (lead free) are suggested by scholars especially for high-temperature applications. One of the alloys recommended so far is Bi-Ag. This alloy has certain similar features to Pb-Sn alloys. Thus, the study focused on several candidate alloys (Bi-1.5-2.5-3.5 wt%Ag) as alternative solders. In this paper, the mechanical properties were studied using shear test. It can be found from the shear test results that increasing the amount of Ag content in the solder matrix positively impact the maximum shear stress and shear strain. The highest maximum shear stress and strain were observed at Bi-3.5 wt%Ag with the value of 13.355 MPa and 44.136 MPa, respectively. Furthermore, the lowest maximum shear stress and strain were observed at Bi-1.5 wt%Ag with the value of 11.032 MPa and 24.955 MPa, respectively. Hence, the fracture behavior shifted from brittle to ductile.