Yunoshev, "Metastable eutectic melting
in the NaCl-H2O system," Thermochimica Acta, vol.
In the case of pure magnesium, an endothermic peak is observed at lower temperatures, corresponding to the Al-Mg eutectic melting
. The reason for this different behavior is due to the fact that EL21 powders are rather coarse, while Mg ones are much finer.
Thus the melting points of tin, silver and copper, the ingredients of most popular Pb-free solders, all can be depressed below 200[degrees]C, well below the eutectic melting
point of 217[degrees]C.
LEAD HAS BEEN an indispensable element in solders due to its high ductility, reasonable mechanical strength, low eutectic melting
temperature with tin, low surface tension and low cost.
It was shown that the material underwent a phase transformation from solid to liquid at 780[degrees]C, which is the eutectic melting
temperature for the material.
The original composition of the alloy was SnBi42 with a eutectic melting
point of 139[degrees]C.