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Novelo-Peralta, O.
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article
Analysis of the microstructural evolution and solidification behaviour of Sn-9 wt% Zn alloy with small additions of Mg
Abstract
<jats:p>The microstructure, solidification behaviour and hardness of Sn-9Zn-xMg(where x = 0, 0.5, 2.5 and 5 wt%) alloys were studied. The addition of 0.5wt% did show a clear effect on the microstructure, producing threedistinctive zones: a) fine eutectic structure b) coarse eutectic structurecomposed by large needles of Zn dispersed into a b-Sn matrix and c) smallparticles of the intermetallic Mg2Sn. The further additions Mg provoked thatthe fine eutectic structure disappeared giving place to the formation acoarse eutectic structure, large particles of Mg2Sn and Zn-rich needles. Thehardness of the alloys increased with the additions of Mg. Similarly, theadditions of Mg steadily drop the eutectic temperature, from 196.5?C for thebinary base alloy to 180?C for the alloy with 5 wt% Mg. The low temperatureachieved in this alloy is very close to the eutectic Sn-Pb alloy (183?C),thus it could be a plausible substitute of the classical Pb-containing solderalloys.</jats:p>