Solidification of Eutectic Bi32.5In51Sn16.5 Alloy under Microgravity Using a Drop Tube
Containerless solidification of Bi32.5In51Sn16.5 eutectic alloy under microgravity conditions was investigated by using a 3 m length drop tube. The Bi-In-Sn system is an important material for lead-free solder and fuse element for electrical protection. It has a low eutectic melting temperature of 60°C, which is suitable for experiments in restricted environments like the International Space Station (ISS), where the security requirements are very strict. Droplets, with diameters in the range of 200 to 400 m, solidified under microgravity, were obtained consistently with irregular ternary eutectic structure, whereas, previous results under normal gravity presented both regular lamellar and irregular structures.
Lucio Salgado and Francisco Ambrozio Filho
R. C. Toledo et al., "Solidification of Eutectic Bi32.5In51Sn16.5 Alloy under Microgravity Using a Drop Tube", Materials Science Forum, Vols. 660-661, pp. 587-592, 2010