Dendritic and eutectic growth in Sb₆₀Ag₂₀Cu ₂₀ ternary alloy

The rapid solidification of Sb₆₀Ag₂₀Cu₂₀ ternary alloy was realized by high undercooling method, and the maximum undercooling is up to 142 K (0.18T _L). Within the wide undercooling range of 40-142 K, the solidified microstructures are composed of (Sb), and phases. High undercooling enlarges the solute solubility of (Sb) phase, which causes its crystal lattice to expand and its crystal lattice constants to increase. Primary (Sb) phase grows in two modes: at small undercoolings non-faceted dendrite growth is the main growth form; whereas at large undercoolings faceted dendrite growth takes the dominant place. The remarkable difference of crystal structures between (Sb) and phases leads to ( + Sb) pseudobinary eutectic hard to form, whereas strips of form when the alloy melt reaches the ( + Sb) pseudobinary eutectic line. The cooperative growth of and phases contributes to the formation of ( + ) pseudobinary eutectic easily. In addition, the crystallization route has been determined via microstructural characteristic analysis and DSC experiment.