The Relationship of Surface Roughness and Hardness of BiSn Solder Alloys due to the Variation of Sn Content

In the current research, we evaluated surface roughness and hardness of five BiSn alloys (20, 30, 40, 50 and 60% Sn) bearing in mind the effect of Sn content on such surface and mechanical properties. In the framework of the prepared samples characterization, SEM was utilized to interpret the relationship between the surface and the hardness properties.Tin-bismuth alloys could be an alternative to lead-based solders for low-temperature uses.However, very little is known abouttheir manufacturability and durability. This article focuses on the relation between the surface roughness and hardness for the prepared alloys.