Abstract

Under terrestrial conditions, solidification processes are influenced to a large degree by the gravity effects such as natural convection or buoyancy force, which can dramatically modify the final characteristics of the grown solid. In the last decades, the coupling of in situ observation of growth from the melt, that enables the study of microstructure formation dynamics, and microgravity experimentation, that allows to approach diffusive conditions, has been implemented for both transparent and metallic materials. The results of these investigations enable to test the validity of advanced solidification theories, to validate or develop numerical models and sometimes to reveal unexpected phenomena. The aim of this paper is to present a selection of conclusive experiments obtained with this combined approach in our group to highlight the gravity effects by a comparative study of experiments carried out on earth and in microgravity conditions.

Graphic abstract

中文翻译：

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二元合金定向凝固过程中重力效应的微重力和地球实验与原位观测对比分析

摘要

在陆地条件下，凝固过程在很大程度上受到自然对流或浮力等重力效应的影响，这可以显着改变生长固体的最终特性。在过去的几十年中，已经对透明和金属材料实施了对熔体生长的原位观察的耦合，这使得能够研究微观结构形成动力学，以及允许接近扩散条件的微重力实验。这些调查的结果能够测试先进凝固理论的有效性，验证或开发数值模型，有时还可以揭示意外现象。

图形摘要