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Abstract

Specimens of the 350 K (77°C) ternary eutectic of the Bi–In–Sn system were solidified unidirectionally at very low speeds and quenched to form a representative solid/liquid interface for subsequent study. From such interfaces, this eutectic was observed to be of the faceted–faceted–non-faceted type, freezing to form the phases Bi (faceted), BiIn (faceted), and γ-Sn, a hexagonal Sn phase (non faceted). A ‘binary’ structure was formed, consisting of regions of quasiregular BiIn–γ-Sn structure and regions of complex regular Bi–γ-Sn structure. In each of these regions, the phase spacing A and growth rate R were found to obey the usual law found for binary eutectic alloys, namely, λ²R = constant. It was found that the γ-Sn phase decomposes on cooling to form the phases Bi, BiIn, and (tetragonal) β-Sn. Observation of precipitates in the BiIn phase showed some solubility for Bi and Sn in this phase at the ternary eutectic temperature.

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Origin of microstructure in 350 K eutectic of Bi–In–Sn ternary system

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