Effect of Alloying Element on Melting

Knowledge on the effect of alloying elements on the melting behavior of lead-free solders is of great importance to the development of new solder alloys and the improvement of existing alloys.

Using the TCS Solder Alloy Solutions Database (TCSLD), this example shows the effect of Zn addition on the melting temperatures of Sn-Zn-Al solder alloys at different fixed Al content. The calculation suggests that the addition of Zn decreases the melting temperature up to a certain amount, and higher Al content in the alloy leads to a higher melting point.

The effect of Zn content on the melting temperatures of Sn-Zn-Al solder alloys at different fixed Al content (experimental data are from Smetana et al.

Figure 1: The effect of Zn content on the melting temperatures of Sn-Zn-Al solder alloys at different fixed Al content. Experimental data are from [2012Sme].

Reference

[2012Sme] B. Smetana, S. Zlá, A. Kroupa, M. Žaludová, J. Drápala, R. Burkovič, D. Petlák, Phase transition temperatures of Sn–Zn–Al system and their comparison with calculated phase diagrams. J. Therm. Anal. Calorim. 110, 369–378 (2012).