Mechanical and Thermal Properties of Zn-xMg Solder Alloys

Abstract

Zn based Lead-free solder is considered to be a promising alternatives of tin-lead solder because of its competitive price and mechanical properties. In this research zinc-based lead-free solder alloys were developed by addition of magnesium. Bulk mechanical and thermal properties of Zn-Mg alloys were investigated. The solder alloys were prepared by casting. Chemical composition of these prepared alloys were confirmed by XRF analysis. The microstructures of the solders changed significantly on increasing Mg content. FESEM images showed an increase in eutectic phase. These microstructural changes improved the mechanical properties like tensile strength and hardness of the newly developed alloy. The melting behavior of the solder alloys was studied by DTA analysis. TMA analysis revealed information on the co-efficient of thermal expansion (CTE) of these alloys at high temperature.