Freezing Shrinkage Dynamics and Surface Dendritic Growth of Floating Refractory Alloy Droplets in Outer Space

Abstract

The freezing shrinkage and dendritic growth are of great importance for various alloys solidified from high temperature liquids to solids since they dominate microstructure patterns and follow‐up processing. However, the microgravity freezing shrinkage dynamics is scarcely explored on the ground as it is hard to suppress the strong natural convection inside liquid alloys. Here, we conduct a series of in‐orbit solidification experiments aboard China Space Station with a long‐term stable 10−5 g0 microgravity condition. A highest temperature up to 2265 K together with substantial liquid undercoolings far from thermodynamically stable state are attained for both Nb82.7Si17.3 and Zr64V36 refractory alloys. Furthermore, we simulate the freezing shrinkage of a droplet without gravity to reveal the liquid‐solid interface migration, temperature gradient, and flow field. It is found that microgravity solidification process leads to freezing shrinkage cavities and distinctive surface dendritic microstructure patterns. The combined effects of shrinkage dynamics and liquid surface flow in outer space result in the dendrites growing not only along the tangential direction but also along the normal direction to the droplet surface. These space experimental results contribute to a further understanding of solidification behavior of liquid alloys under a weaker convection condition, which is often masked by gravity on the ground.This article is protected by copyright. All rights reserved