TITLE:
Effect of Al on Zn and Mg on Zn-Al as Pb Free Solder Alloy
AUTHORS:
Safayet Rafid, Suraya Sabrin Soshi, Al Fahad Ahmed, Md. Abdul Gafur
KEYWORDS:
Tensile Strength, DTA, Solder Alloy, Hardness
JOURNAL NAME:
Materials Sciences and Applications,
Vol.16 No.5,
May
27,
2025
ABSTRACT: The Zn-Al alloy has garnered immense attention in both fundamental and applied research. In this research, the bulk solder properties of Zn-xAl and Zn-5Al-xMg (x = 4, 5 and 6) systems were explored systematically and compositional, thermal, microstructural, mechanical, and electrical characteristics of these alloys are examined and contrasted appropriately. Differential Thermal Analysis (DTA) revealed that the addition of Al in Zn caused the reduction of the melting temperature of Zn from 419˚C to 376.3˚C and Mg in Zn-5Al caused reduction of the melting temperature of Zn-5Al from 376.3˚C to 343.7˚C, respectively. Microstructures of Zn-xAl alloys with different percentages of Al, exactly resembles to the Zn-Al binary phase diagram. When increasing the amount of Mg up to 6 wt% in Zn-5Al alloy, MgZn2 phase increases gradually and consequently lamellar matrix decreased. Al and Mg addition in Zn and Zn-5Al alloy separately caused to increase the tensile strength of Zn and Zn-5Al alloy. Zn-6Al alloy exhibited the highest tensile strength and fracture strain. Aluminum (Al) is often added to zinc (Zn) alloys to enhance their mechanical properties, including hardness. Also, Mg addition in Zn-5Al caused to gradually increase the hardness of Zn-5Al alloy. With increasing the amount of Al from 4 to 6 wt%, electrical resistivity of the Zn based alloys gradually increased. Since the resistivity of β phase is higher than α phase, electrical resistivity of Zn-5Al-xMg alloys were also higher than Zn-5Al alloy. The lowest resistivity of Zn-5Al-xMg system was found to be 8.329 µΩ∙cm for Zn-5Al-5Mg alloy.