Microstructure of Rapidly Solidified Alloys of the Sn–Zn–Bi–In System

• Published in: Physics of metals and metallography 2018-05, Vol.119 (5), p.482-490
• Main Authors: Gusakova, O. V., Shepelevich, V. G.
• Format: Article
• Language: English
• Subjects: Alloy systems; Alloys; Bismuth; Chemistry and Materials Science; Cooling rate; Crystallization; Dependence; Diffusion; Elongation; Foils; Grain boundaries; Grain structure; Materials Science; Metallic Materials; Metals (Materials); Microstructure; Phase composition; Phase Transformations; Quenching; Rapid quenching (metallurgy); Solid solutions; Specialty metals industry; Structure; Zinc compounds
• ISSN: 0031-918X; 1555-6190
• DOI: 10.1134/S0031918X18050058

The results of a study of the phase composition and microstructure of foils of Sn–8.0 Zn–3.0 Bi– X In ( X = 1.5, 2.5, 4.5, 9.0) (wt %) alloys formed by rapidly quenching from the melt at a cooling rate of up to 5 × 10 5 K/s have been presented. The dependence of the phase composition of the rapidly quenched foils on the concentration of In has been determined. It has been shown that, in rapidly quenched foils, crystallization occurs with the formation of supersaturated solid solutions based on β-Sn and γ phase (Sn 4 In). The mechanisms and rates of decomposition of the supersaturated solid solutions at room temperature have been established. The specific features of the formation of the microstructure of the foils have been discussed. The grain structure has been studied by the electron back-scatter diffraction (EBSD) method; the formation of an elongated shape of grains and the high specific surface area of small-angle boundaries has been explained.