Abstract
The crystal nucleation and growth mechanism during the formation ofAg 42.4 Cu 21.6 Sb36 ternary eutectic are investigatedunder substantial undercooling conditions. The x-ray diffractionanalysis shows that the solidified eutectic phases are not involved(Ag) within a wide undercooling range of 6–114 K. This indicates thatunder high undercooling condition, the phase constitution of Ag–Cu–Sbeutectic is different from that in the equilibrium phase diagram. Withthe increase of undercooling, the crystalline morphology ofAg 42.4 Cu 21.6 Sb36 alloy transforms from the mixedstructure of primary θ(Cu2Sb), two pseudobinary eutectics and(ε+θ+Sb) ternary eutectic into a unique (ε+θ+Sb) ternaryeutectic. The calculated results indicate that θ(Cu2Sb) is theleading nucleating phase among the three eutectic phases. In addition,the growth morphology of primary ε(Ag3Sb) compound inAg60Cu6Sb34 alloy exhibits the characteristics ofsolid solution and its orthorhombic dendrite grows along the⟨111⟩ directions.
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